BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:measurements and calculation of induced radioactivity from technol ogical units of the Novosibirsk FEL accelerator-recuperator DTSTART;VALUE=DATE-TIME:20200713T130700Z DTEND;VALUE=DATE-TIME:20200713T130800Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1008@indico.inp.nsk.su DESCRIPTION:Speakers: Tatiana Saluikova (Budker INP SB RAS)\nThe article p rovides estimates and measurements of the levels of induced radioactivity from the technological units of the accelerator-recuperator of Novosibirsk powerful FEL. FEL operates in three modes when the kinetic energy of elec trons reaches 12\, 20\, and 40 MeV. In the range of these energies lies a giant dipole resonance. For control\, copper and stainless steel samples w ere irradiated. Measurements and calculations allow us to estimate the lev els of induced radioactivity and the times of degradation of materials (pr oducts) under the influence of radiation.\n\nhttps://indico.inp.nsk.su/eve nt/24/contributions/1008/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1008/ END:VEVENT BEGIN:VEVENT SUMMARY:The variable period undulator magnetic field measurements and corr ection of the field errors DTSTART;VALUE=DATE-TIME:20200713T130600Z DTEND;VALUE=DATE-TIME:20200713T130700Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1011@indico.inp.nsk.su DESCRIPTION:Speakers: Yaroslav Gorbachev (Budker Institute of Nuclear Phys ics)\nThe new variable period undulator with unique design was developed a nd built recently at Budker INP. It will replace the electromagnetic undul ator being used now at the second FEL of the Novosibirsk FEL facility. As the result the FEL tunability range will be substantially increased. In th is paper we present the results of the undulator magnetic field measuremen ts for different periods as well as discuss the ways to reduce field error s which include magnets sorting\, weakening of undulator edge poles and us ing of steering coils. Results of researches supported by RBRF grant 15-02 -07776 were used in this work.\n\nhttps://indico.inp.nsk.su/event/24/contr ibutions/1011/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1011/ END:VEVENT BEGIN:VEVENT SUMMARY:estimates and measurements of photon and neutron radiation doses of the Novosibirsk FEL micron-recuperator DTSTART;VALUE=DATE-TIME:20200713T130800Z DTEND;VALUE=DATE-TIME:20200713T130900Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1014@indico.inp.nsk.su DESCRIPTION:Speakers: Tatiana Salikova (Budker INP SB RAS)\nThe article pr ovides estimates and measurements of the dose rate of photon and neutron r adiation in the accelerator hall for three modes of operation of the Novos ibirsk powerful FEL\, when the maximum kinetic energy of the electrons rea ches 12\, 20 and 40 MeV. During the operation of the micron-recuperator\, photoneutrons are generated and structural elements are activated. Measure ments and calculations allow us to estimate the levels of induced radioact ivity and the times of degradation of materials (products) under the influ ence of radiation.\n\nhttps://indico.inp.nsk.su/event/24/contributions/101 4/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1014/ END:VEVENT BEGIN:VEVENT SUMMARY:Project of the optical scheme for the soft X-ray & VUV beamline at SKIF synchrotron facility DTSTART;VALUE=DATE-TIME:20200713T133000Z DTEND;VALUE=DATE-TIME:20200713T133100Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1035@indico.inp.nsk.su DESCRIPTION:Speakers: Anton Nikolenko (Budker INP SB RAS)\nThe "electronic structure" is modern beamline for methods using the VUV and soft X-rays ( 10–2000 eV) on the 3 GeV ring at the SKIF synchrotron facility. The coll imated PGM scheme based on a modified SX-700 monochromator is used. During monochromatization and transportation from the frontend to the sample\, t he SR beam passes through five reflective elements\, including a plane def lecting mirror and a plane diffraction grating. The remaining three mirror s have a curved shape\, and two of them are interchangeable in order to ch ange the beam path for transportation to one of the end-stations. To reduc e the contribution of high diffraction orders\, it is planned to additiona lly use a four-mirror high orders suppression system. The calculated param eters of optical elements\, estimates of the thermal load on them\, and ca lculations of the spectral resolution of the optical system in different m odes are presented.\n\nhttps://indico.inp.nsk.su/event/24/contributions/10 35/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1035/ END:VEVENT BEGIN:VEVENT SUMMARY:Comparison of the geochemical profiles of Lake Khindiktykol (Tuva) bottom sediments cores according to the scanning µXRF-SR. DTSTART;VALUE=DATE-TIME:20200713T140200Z DTEND;VALUE=DATE-TIME:20200713T140300Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1812@indico.inp.nsk.su DESCRIPTION:Speakers: Andrey Darin (Sobolev Institute of Geology and Miner alogy SB RAS)\nTwo cores (67 and 105 cm) of high mountain Lake Khindiktyko l (Tuva) bottom sediments were sampling by a hummer gravity corer from dep ths of 64\,7 m in the middle of the lake and of 31\,3 m in the small bay. The upper 170 mm of each core was studied by scanning micro-XRF with synch rotron radiation (µXRF-SR). The analysis was carried out at the experimen tal station "Elemental analysis" in the joined Research Center SSTRC. Expe rimental conditions: excitation energy 23 keV\, dimensions of the exciting radiation beam 1.5 mm in height and 10 mm in width of the sample. The sca nning step was 2 mm in height of the sample. The distributions of more tha n 20 rock-forming and trace elements over the core depth were obtained. Th e distribution of Ti\, Mn\, Fe\, Ni\, Ga\, Y in both cores coincides well. This suggests one source of terrigenous material and similar sedimentatio n rates. Large discrepancies are visible in the distribution of Ca\, As\, Br\, Sr\, Mo. These elements are characteristic of carbonates and biogenic material. The obtained data indicate differences in the sources of matter entering the bottom sediments in different parts of the lake. Additional lithological and geochemical studies are required when choosing bottom sed iments will be used to climatic reconstructions.\nThis work was financiall y supported by the RSF project. № 20-17-00110. The work was done at the joined Research Center SSTRC on the basis of the VEPP-4 - VEPP-2000 comple x at BINP SB RAS\, using equipment supported by project RFMEFI62119X0022.\ n\nhttps://indico.inp.nsk.su/event/24/contributions/1812/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1812/ END:VEVENT BEGIN:VEVENT SUMMARY:Цельнометаллические микроструктур ные элементы управления терагерцовым из лучением DTSTART;VALUE=DATE-TIME:20200713T135600Z DTEND;VALUE=DATE-TIME:20200713T135700Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1836@indico.inp.nsk.su DESCRIPTION:Speakers: Сергей Кузнецов ()\nА.Н. Генце лев1\, С. А. Кузнецов1\,2\,3\, Ф.Н. Дульцев3\,4 \n1 Институт ядерной физики им. Будкера Сиб ирского отделения Российской академии н аук\, 630090\, Новосибирск\, просп. Академика Лаврентьева\, 11\n2 проектно-технологическ ий институт прикладной микроэлектроник и\, 630090\, Новосибирск\, просп. Академика Ла врентьева\, 2/1\n3 Новосибирский государст венный университет\, 630090\, Новосибирск\, у л. Пирогова\, 2 \n4 Институт физики полупро водников им. А.В. Ржанова Сибирского отде ления Российской академии наук (ИФП СО Р АН)\, 630090\, Новосибирск\, просп. Академика Лаврентьева\, 13\n\nОписаны конструкция и с пособы изготовления самонесущих сеточн ых структур\, используемых в качестве кв азиоптических селективных элементов дл я управления электродинамическими хара ктеристиками пучков излучения в диапазо не субтерагерцовых (субТГц) и терагерцов ых (ТГц) частот электромагнитного спектр а (0\,1÷10 ТГц). Толщина изготавливаемых мик роструктур может меняться в диапазоне о т 10 до 1000 мкм. Тонкие структуры изготавли ваются путём плазмохимического травлен ия фольги толщиной 10-30 мкм тяжелых тугоп лавких металлов (в частности вольфрама - W и тантала - Ta) через маску\, сформированн ую посредством фотолитографии. Толстые микроструктуры толщиной 200-1000 мкм изгота вливаются посредством применения глубо кой рентгенолитографии и гальванопласт ики. Толщина самонесущих сеточных струк тур оказывает влияние на АЧХ квазиоптич еских селективных элементов\, что иллюст рируется расчетными графиками спектрал ьной зависимости энергетического коэфф ициента пропускания нулевой дифракцион ной гармоники для высокочастотных фильт ров с шестиугольными отверстиями (сотов ая упаковка)\, характеризующихся различн ой толщиной металла.\n\nПри выполнении ра боты использовалась инфраструктура Цен тра коллективного пользования «Сибирск ий центр синхротронного и терагерцового излучения (СЦСТИ) на базе накопительног о комплекса ВЭПП-3/ВЭПП-4М ИЯФ СО РАН\, под держанного Министерством образования и науки РФ (проект RFMEFI62117X0012).\nКлючевые сло ва: глубокая рентгеновская литография\, L IGA-технология\, плазмохимическое травлен ие\, микроструктуры\, квазиоптические фи льтры\, терагерцовый диапазон.\n\nАлексан др Николаевич Генцелев\,\n630090\, Новосибир ск\, проспект ак. Лаврентьева\, 11\nЕ-mail: ang120 9@mail.ru\; Тел.: (383) 329-41-38\n\nhttps://indico.inp.nsk.su/event/2 4/contributions/1836/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1836/ END:VEVENT BEGIN:VEVENT SUMMARY:THz sensing based on subwavelength grating in attenuated total ref lection configuration DTSTART;VALUE=DATE-TIME:20200713T135700Z DTEND;VALUE=DATE-TIME:20200713T135800Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1031@indico.inp.nsk.su DESCRIPTION:Speakers: Oleg Kameshkov (BINP SB RAS)\, Vasily Gerasimov (Bud ker Institute of nuclear physics SB RAS)\nTHz sensing is very important to ol in biological and medical applications. In this paper\, we study the po ssibility of creating a sensor on a subwave grating in the attenuated tota l reflection (Otto) configuration. Using theoretical analysis and numerica l simulations\, the optimal parameters of the gold grating with liquid wat er solutions under test were found. The sensitivity of the grating sensor has been estimated. This work is partially supported by RFBR grant №16-3 2-00678 мол_а.\n\nhttps://indico.inp.nsk.su/event/24/contributions/103 1/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1031/ END:VEVENT BEGIN:VEVENT SUMMARY:Simulation and Experimental Study of Beam Dynamics in NovoFEL RF G un and its Beamline DTSTART;VALUE=DATE-TIME:20200713T130300Z DTEND;VALUE=DATE-TIME:20200713T130400Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1033@indico.inp.nsk.su DESCRIPTION:Speakers: Anton Matveev (BINP SB RAS)\nA new normal-conducting \, CW\, thermocathode RF gun was developed and tested at Budker Institute of Nuclear Physics recently. Providing average current up to 100 mA\, this device will be used to upgrade the injector of Novosibirsk FEL facility. A beam dynamics simulation in RF gun and its beamline was made with space- charge forces being taken into account. Comparison of the simulation resul ts and experimental measurements is presented in this paper.\nResults of r esearches supported by RBRF grant 15-02-07776 were used in this work.\n\nh ttps://indico.inp.nsk.su/event/24/contributions/1033/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1033/ END:VEVENT BEGIN:VEVENT SUMMARY:Monitoring system of Novosibirsk FEL optical channel state using 1 -Wire devices DTSTART;VALUE=DATE-TIME:20200713T130400Z DTEND;VALUE=DATE-TIME:20200713T130500Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1034@indico.inp.nsk.su DESCRIPTION:Speakers: Sergey Tararyshkin (Budker Institute of Nuclear Phys ics)\nMonitoring system of Novosibirsk FEL optical channel state using 1-W ire devices is described\n\nhttps://indico.inp.nsk.su/event/24/contributio ns/1034/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1034/ END:VEVENT BEGIN:VEVENT SUMMARY:Usage of Epics Channel Access protocol in Novosibirsk FEL control system DTSTART;VALUE=DATE-TIME:20200713T130500Z DTEND;VALUE=DATE-TIME:20200713T130600Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1037@indico.inp.nsk.su DESCRIPTION:Speakers: Stanislav Serednyakov (Budker Institute Of Nuclear P hysics)\nExamples of Usage of Epics Channel Access protocol and High level Applications in Novosibirsk FEL control system are described\n\nhttps://i ndico.inp.nsk.su/event/24/contributions/1037/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1037/ END:VEVENT BEGIN:VEVENT SUMMARY:Characteristic of d-f states in DyNi2Mn and ErCo2Mn compounds wit h strong electronic correlations by resonant photoemission DTSTART;VALUE=DATE-TIME:20200713T141300Z DTEND;VALUE=DATE-TIME:20200713T141400Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1846@indico.inp.nsk.su DESCRIPTION:Speakers: Ekaterina Ponomareva (M.N. Miheev Institute of Metal Physics UB RAS)\nInvestigation of intermetallic compounds have been incre asingly attractive due to their structural and magnetic properties and the possibility of developing new functional materials based on them. The com pounds RT2Mn (R = Dy\, Er\; T = Ni\, Co) crystallize in cubic MgCu2 – ty pe structure by alloying 3d transition metal (T) and rare-earth (R). Certa in amount of manganese is introduced in compounds of this type led to a ch ange in the characteristics of materials [1]. \nThe interplay of d-and f-e lements and its effect on the formation of the electronic structure in suc h compounds as DyNi2Mn and ErCo2Mn are studied. The method used resonant x -ray photoemission spectroscopy allows to select the contributions of the various components in the valence bands (VB). We can study not only the gr ound state\, but also the lifetime of the excited (a core-level hole – V B electron) state\, determine energies of the VB single-particle states an d two-hole states at selected atoms\, see reactions to sudden appearance o f the core-level photo-hole. Resonant photoemission in narrow-band materia ls is described by the sum of first- and second order transitions\, their quantum-mechanical interference leads to an increase in the spectrum from the valence bands and the appearance of an asymmetric dependence on the ph oton energy. Recently\, these effects were studied theoretically and exper imentally using the example of three-component intermetallic compounds TbN i2Mnx [2]. The competition between the elastic and inelastic photoemission channels leads to a different dependence of photoemission spectra from ni ckel and manganese on photon energy. The elastic channel is realized on at oms with large magnetic moments\, the inelastic Auger decay occurs on atom s with small moments.\nThe research was supported by RFBR project № 20-0 2-00541.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1846/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1846/ END:VEVENT BEGIN:VEVENT SUMMARY:Direct writing on PbWO4 monocrystalline using X-rays DTSTART;VALUE=DATE-TIME:20200713T133200Z DTEND;VALUE=DATE-TIME:20200713T133300Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1044@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Nazmov (BUdker Institute of Nuclear Physics )\nThe lithographic profile on the material surface is usually based on ma king structural changes in the intermediate - technological layer using ra diation\, and the subsequent transfer of the resulting topology to the und erlying layer of the functional material. However\, not all materials enab le the removal process that meets the sufficient selectivity value. This r eport presents the results of direct writing a relief on an inorganic PbWO 4 crystal using synchrotron radiation in the X-ray range. This work is par tially supported by RFBR grant № 19-42-540014.\n\nhttps://indico.inp.nsk .su/event/24/contributions/1044/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1044/ END:VEVENT BEGIN:VEVENT SUMMARY:A development of compact combined pump for SRF SKIF DTSTART;VALUE=DATE-TIME:20200713T131100Z DTEND;VALUE=DATE-TIME:20200713T131200Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1777@indico.inp.nsk.su DESCRIPTION:Speakers: Alexey Semenov (BINP SB RAS)\nIt is required an ultr a-high vacuum (near 10-11 Torr in the beam absence mode) in the synchrotro n source of 4+ generation SFR “SKIF”. Owing to the vacuum chambers hav e small molecular conductivity and it exists the space limitation for pump s location\, compact combined pumps application is required\, i.e. pump on the base of non-evaporable getter and sputter ion pump. The modern pumps NEXTorr (SAES Getters\, Italy) are not implemented the all of requirements on the inert gases such as argon and methane for SFR “SKIF”. Therefor e\, it is necessary to create similar combined pumps by Russian manufactur e.\nThe first pumping speed calculations for one cell of triode type sputt er ion pump and the whole of pump are presented here. Also experimental re sults of pumping speed measurements depending on the magnetic field\, diam eter and length of cell for sputter ion pump are given.\n\nhttps://indico. inp.nsk.su/event/24/contributions/1777/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1777/ END:VEVENT BEGIN:VEVENT SUMMARY:The project "Diagnostics in the high-energy X-ray range" beamline at the Siberian synchrotron SKIF DTSTART;VALUE=DATE-TIME:20200713T134800Z DTEND;VALUE=DATE-TIME:20200713T134900Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1780@indico.inp.nsk.su DESCRIPTION:Speakers: Konstantin Kuper (BINP)\nThe project of the beamline “Diagnostics in the high-energy X-ray range” will become the basis fo r advanced scientific experiments in the materials science\, geophysics\, archaeologists\, paleontology\, byology and medicine. A number of research techniques will be implemented at the station using high-resolution intro scopy\, diffraction\, and X-ray scattering.\n\nhttps://indico.inp.nsk.su/e vent/24/contributions/1780/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1780/ END:VEVENT BEGIN:VEVENT SUMMARY:COMPRESSION AND HIGH-PRESSURE TORSION TECHNIQUES FOR DIFFRACTOMETR Y IN SYNCHROTRON RADIATION AND NGR-SPECTROSCOPY DTSTART;VALUE=DATE-TIME:20200713T133500Z DTEND;VALUE=DATE-TIME:20200713T133600Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1784@indico.inp.nsk.su DESCRIPTION:Speakers: Alexander Patselov (M.N. Miheev Institute of Metal P hysics of Ural Branch of Russian Academy of Sciences)\, Eugeny Chernyshev (M.N. Mikheev Institute of Metal Physics\, UB of the RAS\, Ekaterinburg\, Russia)\nTo implement a soft stress state scheme used to obtain high quasi -hydrostatic pressure and large plastic deformations\, Bridgman type stati c anvils and anvils with mutual axial rotation - shear under pressure - ar e most suitable. The last technique has been given the name high pressure torsion (HPT). This method is widely used to study the features of phase t ransitions under pressure and also to obtain and study bulk nanocrystallin e materials. Depending on the task\, anvil punches are used with different bandwidths of x-rays and gamma rays. To study the kinetics\, degree\, and hysteresis of baric phase transformations\, superhard materials with a re latively high permeability of gamma and X-rays are used: cubic boron nitri de (c-NB)\, synthetic sapphire\, and also the skeleton - artificial finely dispersed diamond with SiC binder. A vacuum pumping or an inert gas mediu m is used to create a chemical inert medium. To produce nanocrystalline st ructures of metals and alloys\, the anvil punches made of tungsten carbide with a cobalt binder are mainly used: WC-6. \n To solve a number of spect roscopy tasks under conditions of high static compression and deformation of materials\, a set of HPT methods was created on the basis of hydraulic presses with an effort of 106 and 5 * 10^6 N and also portable cameras for studying *in situ* phase transitions. Operating ranges of varied paramete rs: pressure 1.0 - 18 GPa\, temperature 20 - 800 K\, true logarithmic defo rmation up to (e ≤ 7). A device for measuring the moment of the resistan ce force of samples to deformation by torsion was created with conversion to the resistance to torsion. The device is based on a strain gauge and an electronic dynamometer with data transfer and recording to a computer. To avoid the influence of low and high temperatures\, the strain gauge is mo ved away from the anvil block on the lever 0.52 m from the axis of rotatio n of the anvils.\n The portable chamber for compression and HPT with anvil s made of cubic boron nitride is made of stainless steel. The supporting p arts for the c-NB anvils are made of WC -6\, the rotating anvil is support ed by a thrust bearing. The camera is used *in situ* for two methods: Mös sbauer spectroscopy with E = 14.4 eV and also for X-ray diffractometry\, m ainly on synchrotron radiation (SI) λ = 3685 nm at the SR beamline №4 o f the VEPP-3 storage ring of BINP SB RAS. In the portable chamber\, the fe atures and hysteresis of the baric phase bcc-hcp direct and reverse transi tion both in single-crystal and nanocrystalline samples of pure iron were studied. The exposure time of the spectra using the SI and Mössbauer spec troscopy methods was 1 hour and 60 hours\, respectively. \n The experiment s of the samples produced by mechanical alloying by HPT of non-soluble ele mental powder mixtures of Fe-Cu\, Ag-Cu\, Au-Co were carried out. It is fo und that non-equilibrium nanostructured solid solutions were obtained in a ll concentrations of powder mixtures.\nThe research was carried out within the state assignment of Ministry of Science and Higher Education of the R ussian Federation (theme Рressure No. АААА-А18-118020190104-3)\, sup ported in part by RFBR (project No. 19-32-60039).\n\nhttps://indico.inp.ns k.su/event/24/contributions/1784/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1784/ END:VEVENT BEGIN:VEVENT SUMMARY:AN EXAMPLE OF USING THE OPTICAL CHARACTERISTICS OF METALS OBTAINED BY THE METHODS OF SYNCHRO-TRON RADIATION AND ELLIPSOMETRY TO DETERMINE TH E ELECTRONIC PROPERTIES OF ALUMINUM IN A SOLID STATE DTSTART;VALUE=DATE-TIME:20200713T130100Z DTEND;VALUE=DATE-TIME:20200713T130200Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1020@indico.inp.nsk.su DESCRIPTION:Speakers: Anatoly Kiselev (Federal State government-financed r esearch institution Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences)\nThe technique for establishing the o ptical characteristics of metal-lic systems from synchrotron reflection sp ectra allows one to establish characteristics for the required range of lo w energy values. It is pro-posed to use the procedure for evaluating the e lectronic properties of aluminum by experimentally investigating the spect rum of optical conductivity with subsequent calculation of the Kramers-Kro nig inte-gral relations and the analytical between optical functions. For com-parison\, the results of processing the spectrum of the optical conduc -tivity of an ellipsometric experiment are presented for a range of en-erg y values from 0.5 to 3 eV. A feature of the approach for determin-ing the electronic characteristics of metal systems by minimizing the deviation of the model optical conductivity curve from the experi-mental one is the va riation in the effective mass of the electrons. When using ellipsometry da ta\, the determined electronic characteris-tics change quite sequentially with a change in the effective mass val-ue. The use of data obtained from synchrotron spectra shows the presence of significant local jumps in the m easured values at certain effective masses. Perhaps this is determined by the imperfection in the numerical approaches of interpreting the data of t he synchrotron ex-periment. When modeling optical conductivity\, we can su mmarize the contributions from interband conductivity under the influence of pho-ton energy. In the case of permittivity\, cross-contributions shoul d also be considered. \nThe research was carried out within the state as signment of FASO of Russia (theme № АААА-А19-119031890028-0)\n\nhtt ps://indico.inp.nsk.su/event/24/contributions/1020/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1020/ END:VEVENT BEGIN:VEVENT SUMMARY:FT-IR investigation of netlike polymerization of SU-8 resist layer s during photo- and X-ray lithography processes DTSTART;VALUE=DATE-TIME:20200713T133600Z DTEND;VALUE=DATE-TIME:20200713T133700Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1788@indico.inp.nsk.su DESCRIPTION:Speakers: Elena Reznikova ()\nLayers of multi-component SU-8 r esist\, which includes a diglycidyl ether of bisphenol A novolac as a mono mer\, were investigated by the FT-IR spectroscopic method for a wave numbe r range of 600 - 5000 cm-1 after each step of the photo and X-ray lithogra phy processes (coating\, pre-exposure baking\, exposure\, post-exposure ba king\, development). The doses of absorbed both photo and X-ray radiation were varied from 0.1 to 6000 J/cm3 with uniform dose distribution in the l ayer depth. It was found that the monomers are bonded to each other in ini tial pre-polymer by means of the end disrupted epoxy groups. The band inte nsity at the 914 cm-1 wave number is decreased after heating of exposed SU -8 layer with an increase of a dose of absorbed radiation because of a dis ruption of the glycidyl groups. The disrupted bonds of the pre-polymer mol ecules connect to each other with a net polymer formation\, and the intens ities of FT-IR spectral bands at 1076\, 1110\, 1128 and 1150 cm-1 are enha nced. In contrast to photolithography\, an X-ray exposure results to a dis ruption of the epoxy groups of the pre-polymer molecules as well as a form ation of polymer ester bonds -C-O-C- during both the exposure process and post-exposure baking. The relative quantity of disrupted epoxy groups and the correspondent amount of a new formed polymer bonds in the resist layer are grown with an increase of the dose of the absorbed radiation up to sa turation at about 1000 J/cm3. The dose dependence of a relative number of monomers in the insoluble phase of the residual polymer area after the dev elopment process corresponds to the characteristic curve of a relative res idual thickness of the resist layer. The dose of about 1 J/cm3 is a thresh old for an appearance of the insoluble phase of the layer on a substrate s urface. At approximately 30-60 J/cm3 the shrinkage and swelling of the lay er with the insoluble phase becomes close to zero. The mass ratios of the insoluble and soluble phases in the resist layer in dependence on the dose of absorbed X-ray radiation were determined\, the quantity of absorbed ph otons and the track lengths of photo- and Auger-electrons were calculated in order to model the SU-8 netlike polymerization. The physical-chemical p roperties of SU-8 polymer\, the mechanism and optimization of X-ray lithog raphy processes using synchrotron radiation are discussed.\nThis work is p artially supported by grant №19-42-540014 of Russian Foundation for Basi c Research and Government of Novosibirsk Region.\n\nhttps://indico.inp.nsk .su/event/24/contributions/1788/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1788/ END:VEVENT BEGIN:VEVENT SUMMARY:Optical design of the «Structural Diagnostics» beamline for SRF «SKIF» DTSTART;VALUE=DATE-TIME:20200713T130200Z DTEND;VALUE=DATE-TIME:20200713T130300Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1030@indico.inp.nsk.su DESCRIPTION:Speakers: Zakhar Vinokurov (BIC SB RAS)\nHerewith\, we present the optical design of the «Structural Diagnostics» beamline developed f or a fourth generation synchrotron radiation (SR) source SRF “SKIF”. T he multi section beamline is based on a superconducting undulator (see tab le below) and will have a total of 4 experimental instruments\, three will use fixed energy side branches and the fourth one located on the straight section will have the option of wide energy spectrum. A variety of diffra ction experiments can be accomplished simultaneously at this beamline than ks to such a design. The four aforementioned sections are: High-resolution powder diffraction (straight section 1-2-1)\; In situ diffraction (side s ection 1-2-2)\; Single-crystal X-ray diffraction (side section 1-2-3)\; Sm all angle X-ray scattering (side section 1-2-4). \n \n![Scheme. Optical train of the High-resolution powder diffraction (straight section 1-2-1). \nCalculated spot size at each one of the experimental sections as well as expected fluxes will be presented. Heat management for optical compone nts will be also discussed. \n][1] \n \nTable. Main machine parameter s \n \nEnergy [GeV] - 3 \n \nCircumference [m] -476 \n \nHF [MHz] - 178.47 \n \nHorizontal emittance [pm.rad] - 75 \n \nCoupling cons tant [%] - 10 \n \nBeam current [mA] - 400 \n \nNo. of bunches - 510 \n \nβx\, βy [m] - 13\, 1.9 \n \nTable. Main undulator parameters \n \nPeak field B0 [T] 1.25 \n \nPeriod length λU [mm] 15.6 \n \nMinimum magnetic gap [mm] 8 \n \nMagnetic Length L [mm] ~1997 \n \ nTotal power Ptot (B=1.25 T\, I=0.4 A\, E=3 GeV) [kW] 7.18 \n \nOn-axis power density (B=1.25 T\, I=0.4 A\, E=3 GeV) [kW/mrad2] 50 \n \nAcknow ledgements \nThe work was supported by Ministry of Science and Higher Ed ucation of the Russian Federation (grant No. АААА-А19-119020890025-3) . \n \n \n[1]: https://drive.google.com/open?id=1BoL_jAur8e0l4pLDLUpZP _yfpqwrtML-\n\nhttps://indico.inp.nsk.su/event/24/contributions/1030/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1030/ END:VEVENT BEGIN:VEVENT SUMMARY:Magnetic measurements in small aperture of indirect cooling wiggle r. DTSTART;VALUE=DATE-TIME:20200713T131300Z DTEND;VALUE=DATE-TIME:20200713T131400Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1794@indico.inp.nsk.su DESCRIPTION:Speakers: Sergey Khrushchev (BINP)\nSeveral last superconducti ng wigglers fabricated in Budker INP are of indirect cooling. They all hav e small aperture with cryogenic temperature. This feature makes measuremen ts enough complicated task. Magnetic measurement system designed especiall y for one of such wigglers are described in this article. The results of m agnetic measurements both by Hall probe and by stretched wire method are a lso presented.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1794/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1794/ END:VEVENT BEGIN:VEVENT SUMMARY:Diamond micro-CRL for coherent X-ray imaging and microscopy DTSTART;VALUE=DATE-TIME:20200713T134300Z DTEND;VALUE=DATE-TIME:20200713T134400Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1877@indico.inp.nsk.su DESCRIPTION:Speakers: Polina Medvedskaya (Immanuel Kant Baltic Federal Un iversity)\nWe demonstrate the capabilities of ion-beam lithography (IBL) f or the manufacturing of the X-ray refractive micro-optics. With the help o f IBL\, the hardest of current materials – diamond – was milled\, and micro scale diamond lenses were produced. Lenses have a rotationally parab olic profile with radii of parabola apexes less than 5 μm. As has been co nfirmed with SEM and AFM\, shape profile errors of fabricated lenses were \n\nhttps://indico.inp.nsk.su/event/24/contributions/1877/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1877/ END:VEVENT BEGIN:VEVENT SUMMARY:Conception of vacuum system for SRS «SKIF» DTSTART;VALUE=DATE-TIME:20200713T132200Z DTEND;VALUE=DATE-TIME:20200713T132300Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1879@indico.inp.nsk.su DESCRIPTION:Speakers: Alexander Krasnov (Budker INP SB RAS)\nRequirement f or deep molecular rarefaction inside low aperture beam pipe in presence of high intensity Synchrotron Radiation together with very tight magneto-opt ical system makes performance of vacuum system for modern high brightness Synchrotron Radiation Sources (SRS) quite challenging. To avoid emittance blow-up its beam pipe must be as smooth as possible along beam propagation . It relates to all components like flange connections\, pumping ports and compensators also. In addition\, the vacuum system must be stable over ye ars against inevitable micro-leaks and suitable for possible modifications of other systems\, which require its air venting. The paper presents a co nception of the SRS SKIF vacuum system fitting the set of requirements. A simplified model for estimation and optimization of a scenario for the vac uum system conditioning is also described.\n\nhttps://indico.inp.nsk.su/ev ent/24/contributions/1879/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1879/ END:VEVENT BEGIN:VEVENT SUMMARY:First experiments on new synchrotron radiation technological stati on on the VEPP-4M DTSTART;VALUE=DATE-TIME:20200713T133700Z DTEND;VALUE=DATE-TIME:20200713T133800Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1806@indico.inp.nsk.su DESCRIPTION:Speakers: Boris Goldenberg (Budker INP)\nA new synchrotron rad iation technological station at beamline #1 from the VEPP-4M storage ring was constructed and experimental work started. The station is intend for p ractical training of students to carryout experiments on synchrotron radia tion. The modular concept of construction of station allows us to put stat ion in to operation in stages\, also it allows us to realize various resea rch methods. The article presents the design of the station\, SR beam char acteristics and test experiments on X-ray fluorescence analysis. This work is partially supported by RFBR grant № 19-05-50046. The work was done a t the shared research center SSTRC on the basis of the VEPP-4 - VEPP-2000 complex at BINP SB RAS\, using equipment supported by project RFMEFI62119X 0022.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1806/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1806/ END:VEVENT BEGIN:VEVENT SUMMARY:Development of silicon microstrip detector with integrating readou t for time-resolved studies in microsecond scale. DTSTART;VALUE=DATE-TIME:20200713T142900Z DTEND;VALUE=DATE-TIME:20200713T143000Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1839@indico.inp.nsk.su DESCRIPTION:Speakers: Lev Shekhtman ()\nFirst results from the tests of a new full-size prototype of a silicon microstrip detector with integrating readout for studies of material deformations under pulsed heat load are pr esented. The prototype includes the silicon microstrip sensor with 1024 30 mm long strips with 50 um pitch\, half of which are connected to the inpu ts of analogue pipeline ASICs APC128. The readout electronics can integrat e charge released in the sensor under synchrotron radiation within exposur e time from 100 ns to tens microseconds. Spatial resolution measured at an energy of X-rays about 70 keV is close to 100 um (FWHM). Next steps of th is development including the change of sensor material to GaAs and usage o f the new ASIC DMXG64B for the readout electronics are discussed.\n\nhttps ://indico.inp.nsk.su/event/24/contributions/1839/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1839/ END:VEVENT BEGIN:VEVENT SUMMARY:Beam-beam compensation in a collider based on energy recovery lina c and storage ring DTSTART;VALUE=DATE-TIME:20200713T131200Z DTEND;VALUE=DATE-TIME:20200713T131300Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1792@indico.inp.nsk.su DESCRIPTION:Speakers: Shamil Lachynov (Novosibirsk State University\, Budk er Institute of Nuclear Physics)\nOne of the aims of new circular collider projects is further increasing in their luminosity. The high space charge electromagnetic field at the meeting points limits the achievable current densities and consequently the luminosity. Non-linear focusing compensati on in a storage ring done by the opposite-charge beam circulating in anoth er storage ring was proposed and tested many years ago. Ya. S. Derbenev ha s shown that such a scheme suffers from tune shifts of coherent betatron o scillations\, which move betatron frequencies toward the nearest integer o r half-integer resonance. \nIn this paper\, the collider based on electron energy recovery linac (ERL) and “figure-8” positron storage ring wit h beams of equal currents is considered. Positrons are circulating in a tw o-loop storage ring (positron-positron collider)\, and electron-electron c ollider uses ERL\, as in original Tigner’s proposal. Thus\, a collision of four bunches and space-charge compensation in a multi-bunch mode can b e ensured. The mathematical and numerical analysis of this configuration i s presented.\nResults of researches supported by RBRF grant 15-02-07776 we re used in this work.\n\nhttps://indico.inp.nsk.su/event/24/contributions/ 1792/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1792/ END:VEVENT BEGIN:VEVENT SUMMARY:Status of the development of the silicon microstrip detector for u ltra-fast dynamic studies DTSTART;VALUE=DATE-TIME:20200713T133800Z DTEND;VALUE=DATE-TIME:20200713T133900Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1809@indico.inp.nsk.su DESCRIPTION:Speakers: Lev Shekhtman ()\nNew silicon microstrip detector fo r ultra-fast dynamic studies is being developed in the Institute of Nuclea r Physics SB RAS. The first prototype of such detector with a silicon sens or with 50 um strip pitch\, 30 mm strip length and with 96 active channels equiped with specially developed ASIC is now operating at the SR beam lin e 8 of the VEPP-4M storage ring. The new prototype demonstrated about 20 t imes higher limit of the detected photon flux that the detector can measur e as compared to the current detector DIMEX-G\, based on gas technology. S patial resolution of the new prototype is ~4 times better and frame rate i s about 6 times higher than in the gaseous detector. The first results of operation in multi-bunch mode with VEPP-4M storage ring will be demonstrat ed in the presentation.\n\nThis work is supported by RFBR grant number 19- 42-540006.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1809/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1809/ END:VEVENT BEGIN:VEVENT SUMMARY:Analysis of the individual annual layers elemental composition in the Lake Kucherlinskoe (Altai) varves sediments with submicron spatial res olution by scanning micro_XRF-SR with x-ray optics (poly capillary lenses) . DTSTART;VALUE=DATE-TIME:20200713T140100Z DTEND;VALUE=DATE-TIME:20200713T140200Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1811@indico.inp.nsk.su DESCRIPTION:Speakers: Andrey Darin (Sobolev Institute of Geology and Miner alogy SB RAS)\nSamples for analysis (optical thin section) were prepared f or several core intervals of Lake Kucherlinskoe bottom sediments with well visually distinguished separate annual layers (varves). The annual nature of the layers was previously confirmed by the coincidence of varvechronol ogy (layer counting) with isotopic dating (Cs-137\, Pb-210\, C-14). The th ickness of the annual layers ranged from \n\nhttps://indico.inp.nsk.su/eve nt/24/contributions/1811/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1811/ END:VEVENT BEGIN:VEVENT SUMMARY:A step-wise tapered undulator for the quick-EXAFS beamline at the Siberian Circular Photon Source DTSTART;VALUE=DATE-TIME:20200713T131400Z DTEND;VALUE=DATE-TIME:20200713T131500Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1814@indico.inp.nsk.su DESCRIPTION:Speakers: Andrei Trebushinin (Novosibirsk State University)\nS ynchrotron radiation (SR) provides a powerful tool for studying materials with X-rays in a wide energy range. A combination of high photon flux and flexibility in photon energy tunability allows exploiting SR for absorptio n and emission spectroscopy techniques such as XAS\, XANES\, XES. Some sop histicated techniques like\, for example\, quick X-ray Absorption Fine str ucture (qXAFS) spectroscopy allow to quickly measure the XAS spectrum. qXA FS is based on the use of a fast monochromator that scans through a broad spectral range (1 keV) providing data acquisition in less than 100 ms. How ever\, modern SR sources equipped with superconducting undulators require new approaches for generating radiation with such bandwidth and still reta in the advantage of undulator radiation compared to other broadband source s.\nIn this research\, we propose to use a stepwise tapered magnetic field configuration for the superconducting undulator: we gradually change the magnetic field along the device. An undulator is effectively split into ce lls\, each with a slightly different magnetic field\, such that a given ha rmonic of the radiation emitted in each cell is shifted by half of its ban dwidth. The contribution from the segments sums up to a continuous spectru m with the desired total bandwidth of 1 keV.\nWe studied the performance o f this device both analytically and numerically including propagation of t he emitted radiation up to the sample location. We also studied how propag ation and spatial filtering affects radiation spectral density. This resea rch serves as a conceptual design for the quick-EXAFS beamline at the Sibe rian Circular Photon Source (SKIF ― the Russian acronym) in Novosibirsk\ , Russia.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1814/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1814/ END:VEVENT BEGIN:VEVENT SUMMARY:Development of SRXFA method with the hard X-ray range for paleocli mate reconstruction (region of Lake Baikal) on the storage ring VEPP-4M DTSTART;VALUE=DATE-TIME:20200713T135800Z DTEND;VALUE=DATE-TIME:20200713T135900Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1005@indico.inp.nsk.su DESCRIPTION:Speakers: Aleksandr Legkodymov (Budker Institude of Nuclear Ph ysics)\nThe aim of the research was to identify trends and changes of mois ture supply\, global and local climate regime of the Central ecological zo ne of the Baikal natural territory (the Selenga River). For this\, wet sed iment core samples were analyzed by scanning X-ray fluorescence spectromet ry (SRXFA scanning) in the context of paleoclimate studies. The new SRXFA station on the VEPP-4M storage ring (BINP RAS) was used to determine the e lemental composition of wet cores\, which allows us to significantly expan d the set of detectable elements to 35 or more\, including lanthanides (La \, Ce\, Pr\, Nd\, Sm). The use of this technique in the study of wet botto m sediments showed a high relevance of this method when displaying short-p eriod climatic fluctuations. The obtained data can be used in an interdisc iplinary aspect\, and in particular\, when predicting the water content of Lake Baikal and as a result when planning the activities of the Angarsk H PP cascade. Work is partially supported by RFBR gant 17-29-05016 офи_м .\n\nhttps://indico.inp.nsk.su/event/24/contributions/1005/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1005/ END:VEVENT BEGIN:VEVENT SUMMARY:Superconducting elliptical undulator DTSTART;VALUE=DATE-TIME:20200713T131600Z DTEND;VALUE=DATE-TIME:20200713T131700Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1817@indico.inp.nsk.su DESCRIPTION:Speakers: Pavel Kanonik (Budker Institute of Nuclear Physics)\ nCircularly polarized photons are widely used for conducting experiments t o study the magnetic structures of matter. On the basis of superconducting coils developed at the Budker Institute of nuclear physics for a short-pe riod superconducting planar undulator\, a superconducting elliptical undul ator with a period of ~2.2 cm and an elliptic coefficient of ~ 0.7 is prop osed. The poles of the upper and lower halves of the undulator are located at an angle of 45 degrees to each other in the horizontal plane\, which c reates a periodic vertical and horizontal elliptical field of up to 1 T ve rtically and 0.7 T horizontally. There is a possibility to create a fast s witching left and right polarizations of radiation at a zero angle from t wo sequentially installed undulators by quickly switching the electron orb it using correction magnets external to the cryostat (up to hundreds of He rtz). A short prototype of an elliptical superconducting undulator was mad e and magnetic measurements were made in the bath cryostat. The paper pres ents numerical calculations of the undulator fields\, its spectra\, and th e experimentally measured field.\n\nhttps://indico.inp.nsk.su/event/24/con tributions/1817/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1817/ END:VEVENT BEGIN:VEVENT SUMMARY:Superconducting undulator with a variable configuration of the mag netic field. DTSTART;VALUE=DATE-TIME:20200713T131700Z DTEND;VALUE=DATE-TIME:20200713T131800Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1818@indico.inp.nsk.su DESCRIPTION:Speakers: Pavel Kanonik (Budker Institute of Nuclear Physics)\ nBased on coils developed at the Budker Institute of nuclear physics for a superconducting undulator with a period of 15.6 mm\, a model of a superco nducting undulator with variable polarization (SCUVP)with a period of ~32 mm is proposed. The undulator consists of two superconducting undulators p laced mutually perpendicular and powered by currents independently. Depend ing on the different currents values in the windings of the undulator\, th ere is a possibility to create both an elliptical undulator with different elliptic coefficients\, and planar undulators with linear radiation polar ization at a zero angle both horizontally and vertically. The paper presen ts numerical calculations of the undulator fields and its spectra.\n\nhttp s://indico.inp.nsk.su/event/24/contributions/1818/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1818/ END:VEVENT BEGIN:VEVENT SUMMARY:Measurement of the residual stresses dynamics in tungsten during h eating DTSTART;VALUE=DATE-TIME:20200713T142600Z DTEND;VALUE=DATE-TIME:20200713T142700Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1824@indico.inp.nsk.su DESCRIPTION:Speakers: Ilya Balash (Budker INP\, NSU)\nIn a thermonuclear r eactor plasma interacts with the divertor walls in the form of periodic he at pulses as well as constant heat load. As a result\, residual plastic de formations and mechanical stresses can occur\, which cause destruction of the divertor material. However\, these residual deformations and stresses can be relieved under the influence of constant flux of plasma and the con sequential high temperature of the material. The goal of this work was the study of residual stresses dynamics in a heated material. Residual deform ations and stresses were measured using X-ray diffractometry. The measurem ents were conducted on tungsten samples that were irradiated with an elect ron beam on the BETA facility with the purpose of modeling plasma heat loa ds. SR scattering station “Anomalous scattering” on the beam line 2 of VEPP-3 was used to measure diffractograms from which scattering angle – sample tilt angle dependencies were obtained. The experimental data was u sed for calculation of deformation and stress tensor components. To compar e heat load and residual stress profiles the measurements were conducted w ith spatial resolution. SR scattering station “Diffraction movie” was used for measuring the dynamics of residual stresses during heating. As a result of these experiments scattering angle – temperature dependencies were obtained. Residual stresses relaxation was measured and turned out to be ~75 MPa.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1824/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1824/ END:VEVENT BEGIN:VEVENT SUMMARY:Techniques for generation of annular surface plasmon polaritons wi th refractive binary and reflective cylindrical diffraction gratings DTSTART;VALUE=DATE-TIME:20200713T135100Z DTEND;VALUE=DATE-TIME:20200713T135200Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1016@indico.inp.nsk.su DESCRIPTION:Speakers: Boris Knyazev (Novosibirsk State University)\nThe pr opagation length of surface plasmon polaritons (SPPs) increases with incre asing wavelength\, which makes it possible to use radiation from the far-i nfrared and terahertz ranges to create communication devices in which SPPs will be carriers of information. In this paper\, we consider methods for implementing the multiplex transmission of information along cylindrical c onductors using a combination of SPPs with orbital angular momentum. The w ork was supported in parts by the RSF grant No. 19-12-00103.\n\nhttps://i ndico.inp.nsk.su/event/24/contributions/1016/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1016/ END:VEVENT BEGIN:VEVENT SUMMARY:Current status of the studies of X-ray diffraction on tungsten dur ing pulsed heat loads at the scattering station «Plasma» at the VEPP-4 s ource of synchrotron radiation DTSTART;VALUE=DATE-TIME:20200713T143100Z DTEND;VALUE=DATE-TIME:20200713T143200Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1868@indico.inp.nsk.su DESCRIPTION:Speakers: Sergey Kazantsev (Budker Institute of Nuclear Physic s)\nFusion plasma confinement at facilities based on a tokamak geometry of the magnetic field includes periodical transient heat loads to divertor p lates. The divertor plates of ITER are seem to be covered by polycrystalli ne tungsten. The tungsten tends to crack in case of the pulsed heating. Th e reasons of the crack formation are deformations and mechanical stresses caused by the sharp rise in temperature of thin surface layer. The X-ray s cattering station «Plasma» at the beamline 8 at the VEPP-4M source of sy nchrotron radiation was developed for dynamical measurements of deformatio ns and mechanical stresses in tungsten during pulsed heating simulating by laser radiation. First results were carried out on the mosaic single-crys tal tungsten. The observed evolution of the diffraction peak shape agrees with theoretical predictions based on calculations of deformation caused b y pulsed heating. Deconvolution of the residual stress distribution show g ood agreement with theoretical model of distribution of the deformations i n thin surface layer in the sample during pulsed heating. One of the most important cases was the observation of the bifurcation of the diffraction peak during the occurrence of the crack on the sample during sequential re peated irradiations of the sample. Moreover\, the first experiments on the measurements of the diffraction on polycrystalline tungsten were carried out.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1868/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1868/ END:VEVENT BEGIN:VEVENT SUMMARY:Study of thiacalexarene conformation effect on the electronic stru cture by X-Ray Absorption Spectroscopy and quantum chemistry methods DTSTART;VALUE=DATE-TIME:20200713T141200Z DTEND;VALUE=DATE-TIME:20200713T141300Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1830@indico.inp.nsk.su DESCRIPTION:Speakers: Svetlana Lavrukhina (Nikolaev Institute of Inorganic Chemistry)\nCalixarenes (CA) and thiacalixarenes (TCA) are macrocyclic co mpounds. Calixarenes (CA) and thiacalixarenes (TCA) structure include the upper and lower rims. These molecules can be in cone conformation\, partia l cone\, 1\,2-alternate and 1\,3-alternate. An important feature of CA and TCA is the ability to functionalize molecules by substitution of upper an d / or lower rims by different functional groups\, substitution of methyle ne bridges for S\, SO\, SO2\, N\, NO bridges\, etc.\, and by changes the c onformation of molecules. This makes it possible to widely change the sele ctivity and binding efficiency of various substrates [4]\, which allows th em to be used in extraction processes\, and opens up great opportunities f or the use of CA and TCA molecules in various fields of chemistry\, biolog y\, and physics.\nAccordingly\, the question arises of the effect of confo rmation on the electronic structure and\, as a consequence\, on the physic al and chemical properties of CA and TCA molecules. The methods of X-ray e mission (XES)\, X-ray absorption spectroscopy (XANES\, EXAFS) and X-ray ph otoelectron spectroscopy (XPS)\, as well as quantum-chemical methods are h ighly characteristic and effective methods for studying the electronic str ucture of various chemical compounds.\nIn this paper\, we studied the elec tronic structure of TCA molecules by XES\, XPS\, XANES\, and quantum chemi stry. The influence of molecular conformation on RES and XANES was studied . The X-ray absorption spectra of the acyclic molecule TCA and cone confor mation and 1\,3-alternate were obtained. Quantum-chemical calculations of TCA molecules electronic structure in the cone 1\,3-alternate conformation were carried out by DFT in the ADF software package. Carbon XANES spectra were calculated in the ground state of the molecules and the Z+1 model by ADF software package and by FMDNES program. The experimental K-edges of c arbon absorption of TCA molecules cone\, 1\,3-alternate and acyclic molecu les are compared and compared with the results of quantum chemical calcula tions. Based on the carried out theoretical calculations\, it was shown th at\, the LUMO of the studied TCA molecules were constructed with the parti cipation of 2p AO carbon atoms of CH\, CS\, CO fragments constituent TCA. It is also shown that\, when passing from cone conformation to 1\,3-altern ate conformation\, the LUMO structure changes and the contribution of 2p A O CH fragments becomes dominant.\n\nhttps://indico.inp.nsk.su/event/24/con tributions/1830/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1830/ END:VEVENT BEGIN:VEVENT SUMMARY:Electromagnetic Undulator with switchable period for soft X-ray ap plication in the SKIF project DTSTART;VALUE=DATE-TIME:20200713T132000Z DTEND;VALUE=DATE-TIME:20200713T132100Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1853@indico.inp.nsk.su DESCRIPTION:Speakers: Anatoly Utkin (Budker Institute of Nuclear Physiscs) \nThe “Electronic structure” beamline is dedicated for realization dif ferent photoelectron spectroscopy application in the SKIF project\, requir es intense photon flux in the soft X-ray and VUV ranges (10 - 2000 eV). Th e generation of the undulator radiation in this range is very problematic for electron beams with 3 GeV energy. For keeping the opportunity to cover whole range\, the special undulator design with possibility doubling of t he period was proposed. The commutation of the coils groups provides chang e the undulator period from 10 to 20 cm with keeping the amplitude magneti c field (0.5 T). The undulator mode (5 cm period) gives a big flux for hig h energy edge of the range and the wiggler mode (with period 20 cm) provid es the sufficient number of the photons for soft region (down to 10 eV). S ome details of the undulator design are presented in the report.\n\nhttps: //indico.inp.nsk.su/event/24/contributions/1853/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1853/ END:VEVENT BEGIN:VEVENT SUMMARY:Generation of Smith-Purcell radiation from an array of sub-wavelen gth particles DTSTART;VALUE=DATE-TIME:20200713T132500Z DTEND;VALUE=DATE-TIME:20200713T132600Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1896@indico.inp.nsk.su DESCRIPTION:Speakers: D.Yu. Sergeeva (National Research Tomsk Polytechnic University\, Tomsk\, Russia)\nSmith-Purcell radiation is emitted by an ele ctron moving near a periodically inhomogeneous target. The main features o f Smith-Purcell radiation is monochromaticity and relation between the wav elength of radiation and the observation angle. As during generation there is no direct scattering the electrons on the atoms of material\, this typ e of radiation can serve as a tool for non-invasive beam diagnostics. Here \, we report on the recent progress in theoretical investigation of Smith- Purcell radiation from two-periodical arrays consisting of small particles . Such targets are referred as metasurfaces or photonic crystals as well. Second period in direction perpendicular to the electron trajectory opens new possibilities for the diagnostics of relativistic electron beam\, incl uding simultaneous measuring the two emittances for the electron beams wit h asymmetric cross-section.\nThis work was supported by the Russian Scienc e Foundation\, grant № 19-72-00178.\n\nhttps://indico.inp.nsk.su/event/2 4/contributions/1896/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1896/ END:VEVENT BEGIN:VEVENT SUMMARY:Comparison of experimental data of 3D density of the expansion zon e of TATB detonation products obtained on the synchrotron radiation of VEP P-3 with computer simulation DTSTART;VALUE=DATE-TIME:20200713T143400Z DTEND;VALUE=DATE-TIME:20200713T143500Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1889@indico.inp.nsk.su DESCRIPTION:Speakers: Evgeniy Smirnov (Russian Federal Nuclear Center - VN IITF)\nUnique installations were made - an experimental synchrotron radiat ion station at the VEPP-3 / VEPP-4 accelerator complex: “Explosion”\, “Investigation of the extreme state of matter”. According to the chara cteristics of the experiments\, the station “Investigation of the extrem e state of matter” has no analogues in the world. The new stations made it possible to obtain unique data on measuring the 3D density of the expan sion zone of the detonating TATB.\nIn experiments on measuring the density of the zone of expansion of detonation products\, a difference was found between computer simulation data and data obtained in experiments using sy nchrotron radiation. The new data allowed to modernize the codes for calcu lating the detonation parameters and take into account the condensation pr ocess of the solid nano - phase during the detonation of the used detonati ng systems.\nThis work was supported by RFBR grants 19-29-12045\, 16-29-01 050\, 14-03-00770 and Ministry of Science and Education of Russia grant А ААА-А17-117030310280-6.\n\nhttps://indico.inp.nsk.su/event/24/contribu tions/1889/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1889/ END:VEVENT BEGIN:VEVENT SUMMARY:Способ изготовления LIGA-шаблонов на основе танталовой фольги DTSTART;VALUE=DATE-TIME:20200713T133900Z DTEND;VALUE=DATE-TIME:20200713T134000Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1837@indico.inp.nsk.su DESCRIPTION:Speakers: александр генцелев ()\nА.Н. Ге нцелев1\, Ф.Н. Дульцев2\,3 \n\n1 Институт ядер ной физики им. Будкера Сибирского отделе ния Российской академии наук\, 630090\, Ново сибирск\, просп. Академика Лаврентьева\, 1 1\n2 Новосибирский государственный униве рситет\, 630090\, Новосибирск\, ул. Пирогова\, 2 \n3 Институт физики полупроводников им. А.В. Ржанова Сибирского отделения Россий ской академии наук (ИФП СО РАН)\, 630090\, Нов осибирск\, просп. Академика Лаврентьева\, 13\n\nОписаны конструкция и способ изгото вления высококонтрастных самонесущих п ерфорированных (со сквозными отверстиям и) сеточных LIGA-шаблонов\, используемых в рентгеновском диапазоне длин волн λ ≈ 0\, 5÷3Å. Способ основан на плазмохимическом сквозном травлении танталовой фольги че рез металлическую алюминиевую маску\, сф ормированную на поверхности фольги поср едством фотолитографии. Шаблоны предназ начены для формирования толстых резисти вных масок толщиной 250-1000 мкм\, в частност и\, из негативного резиста SU-8\, что позвол ит создавать толстые планарные металлич еские микроструктуры\, предназначенные для управления потоками электромагнитн ого излучения терагерцевого диапазона.\n В качестве исходной заготовки LIGA-шабл она использовалась танталовая фольга то лщиной 30 мкм и диаметром ~80 мм. Заготовка шаблона проводилась через следующую пос ледовательность операций:\n1. Напыление н а рабочую поверхности заготовки тонкого (толщиной ~ 1\,5 мкм) слоя алюминия (Al).\n2. Фо рмирование резистивной маски на рабочей поверхности заготовки посредством конт актной фотолитографии из позитивного ре зиста SPR 220 (7.0).\n3. Жидкостное травление ал юминия через резистивную маску и удален ие остатков резистивной маски.\n4. Плазмо химическое травление тантала через алюм иниевую маску на глубину 30 мкм.\n\nДоклад содержит СЭМ-фотографии\, иллюстрирующи е как процесс изготовления LIGA-шаблона. П о результатам работы оформлен и получен патент RU №2721172 на изобретение: «Способ и зготовления самонесущего рентгеношабло на» / Генцелев А.Н.\, Дульцев Ф.Н. - Опубл. в Б.И.\, 2020\, №14.\n\nПри выполнении работы исп ользовалась инфраструктура Центра колл ективного пользования «Сибирский центр синхротронного и терагерцового излучен ия (СЦСТИ) на базе накопительного компле кса ВЭПП-3/ВЭПП-4М ИЯФ СО РАН\, поддержанно го Министерством образования и науки РФ (проект RFMEFI62117X0012).\n\nКлючевые слова: глуб окая рентгеновская литография\, плазмох имическое травление\, LIGA-технология\, мик роструктуры\, квазиоптические фильтры\, терагерцовый диапазон.\n\nАлександр Нико лаевич Генцелев\,\n630090\, Новосибирск\, про спект ак. Лаврентьева\, 11\nЕ-mail: ang1209@mail.ru\; Тел.: (383) 329-41-38\n\nhttps://indico.inp.nsk.su/event/24/contributio ns/1837/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1837/ END:VEVENT BEGIN:VEVENT SUMMARY:Theory of multibunch storage ring with transverse feedback DTSTART;VALUE=DATE-TIME:20200713T131900Z DTEND;VALUE=DATE-TIME:20200713T132000Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1838@indico.inp.nsk.su DESCRIPTION:Speakers: NIKOLAY VINOKUROV ()\nMost of contemporary storage r ings operates in multibunch mode. In this case the transverse dynamics in the presence of feedback may be complicated. Indeed\, in general case\, th e amplified signal of a beam position monitor kicks all circulating bunche s. In this paper the stability of such system with many degrees of freedom is considered. Damping times are estimated for the simplest cases.\nResul ts of researches supported by RBRF grant 15-02-07776 were used in this wor k.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1838/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1838/ END:VEVENT BEGIN:VEVENT SUMMARY:Single-color pump-probe setup at the NovoFEL facility for measurin g the temporal dynamics of relaxation in Ge:As DTSTART;VALUE=DATE-TIME:20200713T135500Z DTEND;VALUE=DATE-TIME:20200713T135600Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1835@indico.inp.nsk.su DESCRIPTION:Speakers: Valeriia Kukotenko (Budker Institute of Nuclear Phys ics)\nThe short\, narrow-band THz pulses produced by the Novosibirsk free electron laser (NovoFEL) in combination with a pump-probe experimental set up are a powerful tool to reveal information on the dynamics of resonant p rocesses. In this work\, we present our experimental setup and show some r ecent results on the relaxation of electronic impurity states in germanium at low temperatures.\n\nhttps://indico.inp.nsk.su/event/24/contributions/ 1835/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1835/ END:VEVENT BEGIN:VEVENT SUMMARY:Studying the effects of electron beam irradiation on thermal prope rties and particle size distribution of magnesium hydroxide DTSTART;VALUE=DATE-TIME:20200713T142800Z DTEND;VALUE=DATE-TIME:20200713T142900Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1834@indico.inp.nsk.su DESCRIPTION:Speakers: ThiVanAnh Nguyen (Novosibirsk National State Researc h University)\, Mikhail Mikhailenko ()\nThe aim of this work is to study t he effects of electron beam irradiation on thermal properties and particle size distribution of magnesium hydroxide. The sample was irradiated by th e high-energy electron beam at the different irradiation doses in air at r oom temperature. The high-energy electron beam was generated by electron a ccelerator model ILU-6 which is located in BINP SB RAS\, Novosibirsk\, Rus sia. The changes of thermal behaviours and particle size distribution of s tudied sample were analyzed by using thermogravimetric analysis/ different ial scanning calorimetry\, SR-XRPD and image analysis\, respectively.\nThe TGA and DSC data show that there was no changes occuring in Tmax (the tem perature of maximum rate of mass loss) values of the sample before and aft er irradiation. However\, the irradiated sample began to lose mass at the lower initial temperature as compared with this temperature of the sample without irradiation and the quantities of released water of irradiated spe cimen are higher than these values of non-irradiated one. In addition\, DS C profiles indicate that the endothermic effects of irradiated sample are stronger than that of the sample without irradiation. The SR-XRPD results also agrees with the previous TGA and DSC results.\nThe the median particl e size value (d50) of all irradiated samples is lower than d50 of non-irra diated one.\nThe results of studying of thermal behaviours and particle si ze distribution of magnesium hydroxide before and after modifying by high- energy electron beam irradiation in this work are possitive and greatly im portant\, especilally in studying polymer composite materials using magnes ium hydroxide as a flame retardant. All results indicate that high energy electron beam irradiation significantly improve the flame-retardant proper ties of studied magnesium hydroxide.\nThis work was supported by RFBR gran t 19-29-12045 and Ministry of Science and Education of Russia grant ААА А-А17-117030310280-6.\n\nhttps://indico.inp.nsk.su/event/24/contribution s/1834/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1834/ END:VEVENT BEGIN:VEVENT SUMMARY:“In situ diffraction at extreme conditions” end-station at SKI F DTSTART;VALUE=DATE-TIME:20200713T134000Z DTEND;VALUE=DATE-TIME:20200713T134100Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1840@indico.inp.nsk.su DESCRIPTION:Speakers: Sergey Rashchenko (Sobolev Institute of Geology and Mineralogy\, SB RAS)\nThe “Microfocus” beamline of SKIF storage ring i s a multi-branch undulator beamline to be commissioned in 2024. The “in situ diffraction at extreme conditions” end-station is designed for X-r ay diffraction (powder\, single crystal\, and multi-grain techniques) and total X-ray scattering from samples under high-pressure conditions (up to several million atmospheres) combined with high (up to 6000 K) and cryoge nic temperatures. Extreme conditions will be achieved using diamond anvils cells (DACs) of various designs\, as well as compact toroid (Paris-Edinbu rgh) presses. The end-station offers beam parameters suitable for solving the most demanding user tasks in the fields of Earth and planetary science s\, materials science\, physics and chemistry of the extreme state of matt er etc.\n\nThe section will use radiation of the 15th harmonic of supercon ducting undulator (resonance energy of 30.9 keV)\, with source dimensions (r.m.s.) of 9×8 μm\, divergence of 16×13 mrad\, and integrated flux of about 2×10^13 phot/s/0.1% b.w.\nThe “in situ diffraction at extreme co nditions” end-station will consist of two experimental setups: a laser h eating (LH) and general purpose (GP)\, where experiments can be carried ou t using DACs with resistive heating or cryogenic cooling\, toroid press\, etc.\n\nTo reach the smallest beam focus\, a compound refractive lens (CRL ) with ~1 m focal length will be placed in front of the sample\, collectin g a 10^10 phot/s flux into a 0.3×0.3 μm (FWHM) spot. A moderate focus mode using a pre-focusing CRL located in an optical hutch near the diamond monochromator will be also available. Using the pre-focusing CRL \, almos t the entire photon flux transmitted by the monochromator can be transport ed to the aperture of the focusing CRL. This configuration provide focusin g of larger flux (10^11 phot/s) into a 1.6×1.4 μm spot (FWHM). The flux density in both modes is about 1011 ph/s/μm2\, allowing the proposed sche me to compete with capabilities of similar beamlines of main world synchro tron facilities both in the tight focusing\, and in flux density.\n\nThe r eported study was funded by RFBR according to the research project #18-35- 20047.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1840/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1840/ END:VEVENT BEGIN:VEVENT SUMMARY:XAFS study of stable bimetallic catalysts for selective hydrogenat ion of furfural DTSTART;VALUE=DATE-TIME:20200713T142300Z DTEND;VALUE=DATE-TIME:20200713T142400Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1901@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Kriventsov ()\nToday catalytic reaction of the selective hydrogenation of furfural is perspective way to create of mo tor fuel components and products with high added value. Unfortunately exis ting catalysts providing high conversion of the initial furfural have not sufficiently high selectivity for the target products (70-80%)\, which ind icates the need to develop new significantly more active and selective cat alysts with high stability. In this connection\, the search for correlatio ns between structural features and the charge state of metals in deposited bimetallic clusters and their catalytic activity and selectivity in the p rocess of selective hydrogenation of various functional groups of the furf ural molecule is an urgent research task. This presentation is devoted by a study of the state and local structure of the active component of Ru-Sb\ , Fe-Sb model catalysts catalysts for selective hydrogenation of furfural by XAFS (XANES/EXAFS). The catalysts were prepared by sol-gel from organic and inorganic mono- and bimetallic complex precursors. All XAFS spectra w ere recorded at SSTRC\, Novosibirsk. The genesis of local structures and s tate metals for the prepared nano-structured catalysts were studied in det ail. The interatomic distances and corresponded coordination numbers were determined. All possible structural models were discussed. The obtained XA FS results are in good agreement with XPS\, XRD\, EDX and HRTEM data.\nThe work was carried out in the framework of the RNF project no. 18-73-10216\ , RFBR projects no. 19-05-50046\, 18-03-01251. The work was done at the sh ared research center SSTRC on the basis of the Novosibirsk FEL/VEPP-4-VEPP -2000 complex at BINP SB RAS\, using equipment supported by project RFMEFI 62119X0022.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1901/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1901/ END:VEVENT BEGIN:VEVENT SUMMARY:THE INFLUENCE OF INTERNAL BERYLLIUM MICROSTRUCTURE AND IMPURITIES ON THE CRL X-RAY OPTICAL PROPERTIES DTSTART;VALUE=DATE-TIME:20200713T132300Z DTEND;VALUE=DATE-TIME:20200713T132400Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1894@indico.inp.nsk.su DESCRIPTION:Speakers: Ivan Lyatun (X-Ray Coherent Optics Laboratory (IKBFU ))\nNovel fourth generation and updated synchrotron radiation sources requ ire highest quality X-ray optics resilient to extreme thermal and radiatio n loading while preserving their coherence and brilliance. And refractive optics is the best candidate for this task due to its extensively employed at synchrotrons and X-ray free-electron lasers. Refractive lenses are use d as condensers\, micro-radian collimators\, low-band pass filters\, high harmonics rejecters\, beam-shaping elements. Two-dimensional beryllium len ses are and remain the driving force in the development of Fourier optics\ , coherent diffraction and full-field imaging techniques. However\, the de velopment of new coherent techniques such as phase-contrast imaging and co herent diffraction microscopy demanded to revise the requirements for surf ace quality and internal structure of X-ray optic materials [1-3].\nIt is worth noting that almost all beryllium grades\, used for X-ray optics manu facturing\, are sintered materials\, which have inevitably internal micro- and nanograined structure and relatively high beryllium oxide (BeO) and o ther heavy elements concentration\, which leads to strong small- and ultra -small angular X-ray scattering and additional losses of intensity [4]. Th e influence of the beryllium microstructure and impurities on the optical properties of the compound refractive lens was studied and successfully de monstrated for the first time in the microbeam and coherent full-field har d X-ray microscopy mode [5]. The paper includes recommendations on berylli um refractive lenses and beryllium windows manufacturing processes by usin g different beryllium grades for various applications of X ray optics. We are confident that there is a reasonable choice of beryllium materials sui table for coherence related techniques allowing to use the full potential of novel X-ray sources.\nThis research was supported by the Russian Scienc e Foundation (Project No. 19-72- 30009).\n\n\n[1] A. Snigirev\, V. Kohn\, I. Snigireva\, B. Lengeler\, Nature\, 384 (1996) 49. \n[2] A. Snigirev\, I . Snigireva\, Springer Series in Optical Sciences\, 137 (2008) 255.\n[3] T . Roth\, A. Snigirev\, A.andetal. MRS Bulletin\, 42(6)\, (2017) 430-436.\n [4] I. Lyatun\, A. Goikhman\, P. Ershov\, I. Snigireva\, A. Snigirev\, Jou rnal of Surface Investigation. X-ray\, Synchrotron and Neutron Techniques \, 9 (2015) 446.\n[5] I. Lyatun\, P. Ershov\, I. Snigireva\, A. Snigirev\, Journal of Synchrotron Radiation\, 27(1)\, (2020).\n\nhttps://indico.inp. nsk.su/event/24/contributions/1894/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1894/ END:VEVENT BEGIN:VEVENT SUMMARY:SECONDARY MINERAL FORMATION MONDMILCH FROM BOTOVSKAYA CAVE (EASTER N SIBERIA) DTSTART;VALUE=DATE-TIME:20200713T140400Z DTEND;VALUE=DATE-TIME:20200713T140500Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1844@indico.inp.nsk.su DESCRIPTION:Speakers: Yulia Sholokhova (IGC SB RAS)\nMondmilch\, or moon m ilk\, is a special type of speleothems (secondary mineral formations forme d in a cave environment from a primary mineral as a result of physical and chemical reactions). This mineral formation is a soft clay-like substance with a high water content\, which becomes fluid when touched. In caves\, mondmilch is found in the form of covers\, leaks\, lumps on the walls and on the floor\, extensive deposits and small solitary formations. The compo sition of moon milk dependes on the rocks in which the underground cavity is located. It can be carbonate\, gypsum\, aluminosilicate and phosphate [ Chirienco\, 2004].\nThe questions of the moon milk origin and the variabil ity of its crystalline structure are con-troversial. It remains uncertain as the thixotropic characteristics (fluidity) of the sediment and water co ntent are changing in accordance with the features of the crystals formed the formation. It is possible that there are some regularity between the c omposition\, structure of the crystals and the physical properties of this type of sediment. There is also a hypothesis about the biogenic origin of the moon milk. It is known that microorganisms of different physiological groups were found in the secondary formation content [Hill\, Forti\, 1997 ]\, and it can be assumed that microorganism cells can act as crystallizat ion centers during the formation of moon milk\, but the hypothesis that th e microbiota is secondary in the content of moon milk and the sedimentatio n is its habitat.\nThis paper presents the data on chemical composition an d morphology of crystals of the samples of moon milk (mondmilch) from Boto vskaya cave\, which is the largest in Russia. It was determined that moon milk is characterized by increased concentrations of Ca and Sr and lower c ontents of Ti\, Mn and Fe relatively to the host rocks. The morphology of mondmilch crystals indicates that the genesis of this secondary mineral fo rmation is based on both abiogenic and biogenic mechanisms.\nIt should als o be noted that this type of sediment has been studied using the XRF SR me thod for the first time. The examination of sampled specimens provides new information on chemical composition and structure of moon milk in caves of carbonate karst.\nThis work is partially supported by RFBR grant №13- 05-90780.\nReferences\nChirienco M. The crystalline phase of the carbonate moonmilk: a terminology approach // Acta carstologica\, 33/1\, 2004. p. 2 57-264.\nHill C. A.\, Forti P.\, Cave minerals of the world // NSS. Huntsv ille\, 1997. p. 463.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1 844/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1844/ END:VEVENT BEGIN:VEVENT SUMMARY:The NovoFEL Optical Diagnostics Upgrade DTSTART;VALUE=DATE-TIME:20200713T130900Z DTEND;VALUE=DATE-TIME:20200713T131000Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1015@indico.inp.nsk.su DESCRIPTION:Speakers: D. Reshetov (Budker INP)\, O.I. Meshkov (Budker INP) \, V.L. Dorokhov (Budker INP)\, Vladislav Borin (BINP)\nNovosibirsk Free E lectron Laser (NovoFEL) is based on rather complicated accelerator system. Complex uses three separate FELs installed on various Energy Recovery Lin acs (ERLs). ERLs operate with high average beam current (about 5 mA). The severe restrictions on the electron bunch parameters for the lasing requir e the beam diagnostic system. The transverse beam profile measurement syst em uses an electron beam synchrotron radiation (SR) from the bending magne t and the optical transition radiation (OTR) from the aluminum foil. This allows adjusting the beam parameters before the undulator and measuring th em after lasing. This year\, the diagnostic complex has been improved by t he installation of additional SR monitor at the place with a large dispers ion function and spectrometer for studying the undulator radiation. The re cent results of the beam dynamics measurements and calculations are presen ted.\nThis work was supported by grant 18-72-00123 of Russian Science Foun dation.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1015/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1015/ END:VEVENT BEGIN:VEVENT SUMMARY:The nongaussian behaviour of the spread function of the x-ray poly capillary lens: characteristical cases and new nonstandard approximation m odels DTSTART;VALUE=DATE-TIME:20200713T140500Z DTEND;VALUE=DATE-TIME:20200713T140600Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1849@indico.inp.nsk.su DESCRIPTION:Speakers: Dmitry Sorokoletov ()\nThe spread function of a x-ra y polycapillary lens may be approximated very accurately by a laterally sy mmetrical gaussian function [1]. However it is true statement for the spac ial fields whose are near to a focus of the lens only. We carried out the research to clarify a specifics of the lateral spacial distribution of the intensity of x-ray radiation around more spacious areas (placed more farl y from lens' focus along axial directions). As the result we found that in many cases a range of characteristical features of nonstandard behavior f or the spread function are exist. They may be asymmetrical behavior of gau ssian peak (most frequently)\, superposition of two peaks (whose are respe ctively big and small)\, strong nongauss behavior\, etc.\n We consider for all these effects to be explained fully by a nonaccuracy adjustment of an gles and position of the polycapillary lens because of a limited precision of applied piesomechanics. Herewith most acceptable of the quality of the adjustment of the lens refers to cases of asymmetrical behavior of gaussi an peak of the spread function of the lens. In the frame of this research a range of series of scanning experiments for detecting the spread functio n of the x-ray lens was carried out. The numbers of these series and the e xperiments of each series were be about 10. (Each series corresponded to a n individual case of adjustment of the polycapillary lens\, whereas a sing le experiments in each series referred to an individual case of spacial po sition of interesting field of spread function along the axial direction.) \n We selected the range of the cases of the detected spread functions in order to be proceed by the quantitative analysis (approximation) those ref er to the cases of most good quality of lens' adjustment. After that a var ious of approximation models (asymmetrical gaussians\, extreme\, logistpk\ , lorentz peaks [2]\, some our models) were tested by us. As the result it was shown that most good results refer to the cases of the extreme peaks approximation model additionally modified by us.\nThe scanning experiments were carried out at Synchrotron and Terahertz Research (INP SB RAS\, Novo sibirsk) and the Kurchatov Complex of Synchrotron-Neutron Research (KISI\, Moscow) using a confocal X-ray microscope. The work was carried out in th e framework of the RFBR projects no. 19-05-50046. The work was partly done at the shared research center SSTRC on the basis of the VEPP-4-VEPP-2000 complex at BINP SB RAS\, using equipment supported by project RFMEFI62119X 0022.\n[1] Mantouvalou\, W. Malzer\, and B. Kanngiesber\, “Quantificatio n for 3D Micro X-ray Fluorescence\,” Spectrochimica Acta. Pt. B 77\, 9 –18 (2012).\n[2] http://www.originlab.com/pdfs/16_CurveFitting.pdf\n\nht tps://indico.inp.nsk.su/event/24/contributions/1849/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1849/ END:VEVENT BEGIN:VEVENT SUMMARY:Measuring Installation for Determining Current-Voltage Characteris tics at Liquid Helium Temperature DTSTART;VALUE=DATE-TIME:20200713T131000Z DTEND;VALUE=DATE-TIME:20200713T131100Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1776@indico.inp.nsk.su DESCRIPTION:Speakers: Alexandr Brodnikov (inp.nsk.su (l.8-2))\nMeasuring p lant are made on the base of cryostat КГ-60/300-1 in internal cavity of which\, in liquid helium medium\, solenoid is located\, and in its central part insert-holder with sample is located. Power supply of solenoid and t ested sample\, by current leads located in the upper cover of cryostat\, a re performed by power supplies of Danfysik - system 8800 company with the help of PC and control program developed in BINP. In order to test the pla nt for determination of current–voltage characteristics (CVC) in superco nductors at helium temperatures\, test measurements were carried out accor ding to the method MVI 400-423/8-2018 developed by JSC VNIINM [2]. Measure ments were made on composite wire samples based on the Nb-Ti alloy\, 0\,08 m long and 0\,5 and 0\,85 mm diameters cut from the wires of standard bat ches\, with CVC being indicated by the manufacturers of these superconduct ors. He calculated value of the critical current specified by the manufact urer of the measured superconducting wires at the 7 T shall be 200 A and 3 72 A. The value we have obtained is 212 A and 382 A\, which is less than 1 0% [4] and this corresponds to the limit of the permissible basic absolute error of the meter В7-99 which is ± (1\, 5·10-3 + 4\, 5·10-5 | U |) m V (U - measured voltage\, mV). As can be seen\, the operability of the mea suring unit for determining the actual critical current values is confirme d\, and obtaining a more accurate measurement result will allow modern pre cision digital measuring equipment\, with the permissible basic absolute e rror of ± 0\,0025%+ 0\,02 nV.\n\nhttps://indico.inp.nsk.su/event/24/contr ibutions/1776/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1776/ END:VEVENT BEGIN:VEVENT SUMMARY:Development of indirect cooling cryogenic system with nitrogen and helium heat pipes for superconducting insertion devices in BINP. DTSTART;VALUE=DATE-TIME:20200713T132100Z DTEND;VALUE=DATE-TIME:20200713T132200Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1858@indico.inp.nsk.su DESCRIPTION:Speakers: Valeriy Tsukanov (BINP)\nThe using of indirect cool ing cryogenic system based on cryocoolers for superconducting insertion d evices (wigglers and undulators) gives opportunity\, in contrast to magnet s immersed into liquid helium\, to reduce the size of the magnetic gap due to the removal from it the walls of the helium vessel and increase the m agnitude of the magnetic field. To increase the cooling efficiency of such a magnet\, which is in vacuum and does not have direct thermal contact wi th cryogenic liquids\, the heat pipes of siphon type filled by nitrogen and helium is used as the heat conductors for connecting of superconductin g magnet with cryocoolers stages. The article describes the principle of o peration\, design and application features of the heat pipes on several in directly cooled superconducting insertion devices created in BINP.\n\nhttp s://indico.inp.nsk.su/event/24/contributions/1858/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1858/ END:VEVENT BEGIN:VEVENT SUMMARY:Structural study of Pt-complexes in aqueous solution by EXAFS DTSTART;VALUE=DATE-TIME:20200713T141500Z DTEND;VALUE=DATE-TIME:20200713T141600Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1865@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Kriventsov ()\nThis work is devoted to the study of the process of hydrolysis of chloride Pt(II) complexes and Pt(IV) nitrate complexes existing in aqueous solutions of different nature by EX AFS spectroscopy.\nThe deposited platinum catalysts are inevitable in vari ous industrial oxidation and reduction processes due to their unique prope rties\,. The variety of catalytic properties is determined by the possibil ity of varying the dispersion and lability of the active component. It is quite obvious that the development of methods for fine control of Pt dispe rsion is necessary to study the fundamental relationships between the size \, state of the active component nanoparticles\, their detailed electronic structure\, and the actual properties of a catalyst in a chemical reactio n. As a rule\, various precursor solutions based on Pt(IV) and Pt(II) salt s are used for the synthesis of platinum catalysts\; after precipitation t o a carrier the system undergoes various heat treatments. The main factor affecting the dispersion of Pt forms existing in salt solutions is the ong oing hydrolysis process. To implement the research goals\, ~0.01-0.05 M aq ueous solutions of K2 PtCl4 and nitrate solutions of Pt (IV) with differen t ligand environments were prepared and EXAFS spectra (Pt-L3 edge) of stu died samples were recorded at SSTRC\, Novosibirsk. The composition and str uctures of the hydrolysis products being polynuclear platinum (II) hydroxo complexes (PHC-Pt) were studied. It was found that during the hydrolysis r eaction of [PtCl4]2-complexes\, oligomeric chains containing Pt-O-Pt fragm ents are formed\, in which neighboring Pt atoms are connected by a single O–bridge atom. Aging of solutions containing PHC-Pt for a long time\, by formation of 3D-oxide structures. does not take place\, in contrast to so lutions of PHC-Pd (II) and PHC-Pt (IV). Increase in size of PHC-Pt particl es is shown to take place while the process of oligomerization of Pt(II) m ononuclear complexes proceeds. It was shown that during hydrolysis of Pt(I V) nitrate solutions\, Pt(IV) polynuclear hydroxocomplexes were formed. It was established that the nearest environment of Pt in these solution is a lways octahedral\, with the distortion caused by replacing the O part with the N part. However\, formation and stabilization of various agglomerated Pt-containing forms of different nuclea are possible. It was found out th at the nuclearity of various forms and their resistance to hydrolysis depe nd on the preliminary history of the sample and the nature of O\, N-ligand s in the platinum coordination sphere platinum in the solutions. The Pt-O\ , N\, and Pt-Pt distances and corresponding coordination numbers are deter mined. Variants of possible structural models are considered. Additionally \, all prepared samples of solutions were examined by NMR\, TEM methods. D ata from all these methods agree with each other.\nThe work was carried ou t in the framework of the RFBR projects no. 19-05-50046\, 18-03-01251. The work was done at the shared research center SSTRC on the basis of the Nov osibirsk FEL/VEPP-4-VEPP-2000 complex at BINP SB RAS\, using equipment sup ported by project RFMEFI62119X0022.\n\nhttps://indico.inp.nsk.su/event/24/ contributions/1865/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1865/ END:VEVENT BEGIN:VEVENT SUMMARY:Focusing system of synchrotron radiation with refractive mosaic le nses for the station “Extreme state of matter” of the VEPP-4 DTSTART;VALUE=DATE-TIME:20200713T143000Z DTEND;VALUE=DATE-TIME:20200713T143100Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1862@indico.inp.nsk.su DESCRIPTION:Speakers: Alexandr Berdyugin (INP)\nThe purpose of the work is to create a system for focusing synchrotron radiation for the station “ Extreme state of matter” on a VEPP-4 [1]. For experiments at this statio n\, there is a problem of insufficient radiation intensity\, which worsens the statistics in fast processes experiments with an exposure time of dif fraction patterns of 100 ps [2\, 3\, 4\, 5\, 6]. This problem can be solve d through the use of refractive focusing optics made of a polymer (epoxy r esin SU-8). An x-ray mosaic lens was chosen for focusing [7]. The system m akes it possible to focus SR into a smaller spot by increasing the radiati on intensity and allowing realizing a local structural analysis. The follo wing tasks were solved:\n1) the mechanical precision parts of the detector alignment and fastening system are designed and manufactured\;\n2) a cont rol program for the adjustment device is designed\;\n3) a calculation was made of the heat absorption on the lens and its heating under monochromati c and polychromatic radiation using the ANSYS program\;\n4) the system is installed and debugged on the channel No. 8 VEPP-4\;\n5) an experiment was conducted to focus synchrotron radiation on a monochromatic beam.\nIn the experiment it was shown that the lens stably works on monochromatic radia tion\, but it heats up strongly (heating rate of 17 deg / s) on polychroma tic radiation. A scheme of the pulsed operation of the lens (active interv al of 100 ms) for the study of fast-flowing processes on polychromatic rad iation is proposed.\nThis work was supported by RFBR grant 19-29-12045 and Ministry of Science and Education of Russia grant AAAA-A17-117030310280-6 .\n\n1. Tolochko B.P\, Kosov A.V.\, Evdokov O.V.\, Zhogin I.L.\,Ten K.A.\, Pruuel E.R.\, Shekchtman L.I.\, Aulchenko V.M.\, Zhulanov V.V.\, Piminov P.F.\, Nazmov V.P.\, Zolotarev K.Vb \, Kulipanov G.N. The synchrotron rad iation beamline 8-b at VEPP-4 collider for SAXS\, WAXS and micro tomograph y investigation of fast processes at extreme condition of high temperature and pressure with nanosecond time resolution. Physics Procedia 84 ( 2016 ) 427 – 433\n2. Aulchenko\, V.M.\, Zhulanov\, V.V.\, Kulipanov \, G.N.\, Ten\, K.A.\, Tolochko\, B.P.\, Shekhtman\, L.I.Investigations of fast processes by X-ray diffraction methods at the Siberian Synchrotron a nd Terahertz Radiation Center(2018) Physics-Uspekhi\, 61 (6)\, pp. 515-530 . \n3. Pruuel\, E.R.\, Ten\, K.A.\, Tolochko\, B.P.\, Merzhievskii\, L.A.\ , Luk'Yanchikov\, L.A.\, Aul'Chenko\, V.M.\, Zhulanov\, V.V.\, Shekhtman\, L.I.\, Titov\, V.M. Implementation of the capability of synchrotron radia tion in a study of detonation processes(2013) Doklady Physics\, 58 (1)\, p p. 24-28. \n4. Arakcheev A.S.\, Aulchenko V.M.\, Balash I.I.\, Burdakov A. V.\, Chernyakin A.D.\, Dokutovich V.A.\, Evdokov O.V.\, Kasatov A.A.\, Kaz antsev S.R.\, Kosov A.V.\, Popov V.A.\, Sharafutdinov M.R.\, Shekhtman L.I .\, Shoshin A.A.\, Tolochko B.P.\, Vasilyev A.A.\, Vyacheslavov L.N.\, Vai gel L.A.\, Zhulanov V.V. Dynamic observation of X-ray Laue diffraction on single-crystal tungsten during pulsed heat load.\nJournal of Synchrotron R adiation. 2019. Vol. 26. P. \n5. Aulchenko V.\, Shekhtman L.\, Zhulanov V. \, Tolochko B.\, Pruuel E.\, Ten K. Development of the microstrip silicon detector for imaging of fast processes at a synchrotron radiation beam.\nN uclear Instruments and Methods in Physics Research. Section A: Accelerator s\, Spectrometers\, Detectors and Associated Equipment. 2017. Vol. 845. P. 169-172.\n6. Arakcheev A.\, Aulchenko V.\, Kudashkin D.\, Shekhtman L.\, Tolochko B.\, Zhulanov V. Development of a silicon microstrip detector wit h single photon sensitivity for fast dynamic diffraction experiments at a synchrotron radiation beam.\nJournal of Instrumentation. 2017. Vol. 12. P. C06002.\n7. Nazmov V.P.\, Tolochko B.P. Patent RF 2572045.\n\nhttps://ind ico.inp.nsk.su/event/24/contributions/1862/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1862/ END:VEVENT BEGIN:VEVENT SUMMARY:Method for polarization shaping at free-electron lasers DTSTART;VALUE=DATE-TIME:20200713T131500Z DTEND;VALUE=DATE-TIME:20200713T131600Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1815@indico.inp.nsk.su DESCRIPTION:Speakers: Andrei Trebushinin (Novosibirsk State University)\nX -ray free-electron lasers (FEL) deliver high-power\, ultra-short polarized X-ray pulses\, where the polarization state is determined by the electron beam trajectory in the FEL undulator. In this way\, the polarization stat e depends on the kind of a magnetic structure used\, and is fixed along th e entire pulse. However\, it would be beneficial to control the dependence of the polarization shape on time over the scale of one single pulse dura tion (about tens of femtoseconds). Such radiation may enable study of ultr afast molecular dynamics and magnetism.\nIn this contribution\, we discuss a new method to control the polarization state of a single FEL pulse long itudinally (in time) and/or transversely (spatially) on the scales of 100 femtoseconds and several micrometers respectively.\nWe propose to use a cr ossed-undulators setup consisting of a pair of two co-axial Apple-X undula tors. These undulators are scheduled for installation downstream the nomin al SASE3 undulator line of European XFEL and they may be tuned to emit rad iation pulses with two orthogonal polarization states\, e.g. linear (verti cal and horizontal) or circular (right and left). Both pulses upon reachin g the sample are overlapped both spatially and temporally with some phase difference. Their interference yields polarization states\, circular or li near respectively\, with orientation that depends on that phase difference . If the frequency of one of the pulses is detuned\, polarization of the r esulting radiation will be shaped temporally. If the distance between the undulator cells is considerable\, a difference between the wavefront curva tures allows shaping the resulting polarization spatially. We investigate possibilities to maximize or minimize both effects with a focusing system and demonstrate it with numerical simulations.\n\nhttps://indico.inp.nsk.s u/event/24/contributions/1815/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1815/ END:VEVENT BEGIN:VEVENT SUMMARY:Pulsed wire field measurements of 38-period superconducting undula tor prototype DTSTART;VALUE=DATE-TIME:20200713T131800Z DTEND;VALUE=DATE-TIME:20200713T131900Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1820@indico.inp.nsk.su DESCRIPTION:Speakers: Fedor Kazantsev (Novosibirsk State University)\nIn t his paper\, a pulsed wire method (PWM) for magnetic measurements was descr ibed. Experimental setup was developed and assembled. The results of measu rements on superconductive 38-pole 0.75 T undulator are given. Two differe nt wires were used – 200µm and 140 µm diameter. For 140µm the calibra tion curve was obtained\, wire position sensor has high sensitivity – 0. 28 V/µm. A dispersion correction algorithm was applied to the raw data fr om sensor and corrected signals were given. The results and further works are being discussed.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1 820/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1820/ END:VEVENT BEGIN:VEVENT SUMMARY:XAFS study of zirconium oxides modified by yttrium and magnesium DTSTART;VALUE=DATE-TIME:20200713T141600Z DTEND;VALUE=DATE-TIME:20200713T141700Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1866@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Kriventsov ()\nToday the mixed oxides with a fluorite structure of the composition (Zr\, Y) O2-x are widely used to h arden ferritic steels used as fuel element cladding materials for the new generation of fast neutron reactors operating under irradiation and high t emperatures. This work is devoted to study of the state and local structur e of samples of zirconium oxides modified by yttrium and magnesium\, prepa red by coprecipitation and calcined at a temperature of 1250 °C. XAFS (XA NES/EXAFS) spectra (Y-K\, Zr-K edges) of studied samples were recorded at SSTRC\, Novosibirsk. It was shown that from the yttrium side\, the XANES s pectra of both samples were almost identical. On the zirconium side\, the XANES spectra have minor differences. It can be assumed that the charge st ate and the nearest environment of yttrium also practically does not chang e depending on the composition of the samples. For zirconium\, with the ch arge state unchanged\, some changes in the nearest oxygen environment appe ar to occur due to the composition of the samples. It was found out that t he curves of the radial distribution of atoms (RDFs) obtained from the EXA FS spectra of the studied samples have a number of characteristic features . Only the first coordination spheres of the Me-O and Me-Me types are obse rved\, but long-range coordination spheres (more than ~0.45 nm) are practi cally absent\, which may indicate distortions of the long-range order in t he structures. The local yttrium arrangement is stable when the compositio n of the samples changes\, which may indicate the formation of clusters th at include only Y and O elements. The local zirconium arrangement depends on the composition of the samples\, since there are some differences in th e RDFs curves. Thus\, the amplitudes of the peaks assigned to the coordina tion spheres Zr-O and Zr-Me are significantly reduced (by more than 25%) f or the Y\,Mg- modified sample in comparison with those for the Y- modified sample\, which indicates distortions of the original fluorite structure. The observed changes in the Zr-O and Zr-Me distances (more than 0.05) are greater than the changes due to differences in the cell parameters for the compared samples. Using the model of statistical solid solution with a fl uorite structure\, it is suggested that the presence of Y-O clusters preve nts refinement of structures.\nThe work was carried out in the framework o f the RFBR project no. № 19-03-00530. The work was done at the shared re search center SSTRC on the basis of the Novosibirsk FEL/VEPP-4-VEPP-2000 c omplex at BINP SB RAS\, using equipment supported by project RFMEFI62119X0 022.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1866/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1866/ END:VEVENT BEGIN:VEVENT SUMMARY:X-ray reflecto-interferometer based on compound refractive lenses for thin-films study DTSTART;VALUE=DATE-TIME:20200713T134400Z DTEND;VALUE=DATE-TIME:20200713T134500Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1878@indico.inp.nsk.su DESCRIPTION:Speakers: Maria Voevodina (Immanuel Kant Baltic Federal Univer sity)\nCompound refractive lenses (CRLs) have been widely used for more th an 20 years on leading synchrotrons and free-electron lasers for hard X-ra y beam transport\, collimation and focusing [1-2]. The combination of cohe rent compatible optics and new coherent sources increased opportunities fo r the development of new research methods.\nIn this abstract\, we demonstr ate a new X-ray interferometer based on compound refractive optics (CRL) f or thin-film structures study [3]. The idea of a reflecto-interferometer i s to use a very simplified experimental setup\, where a coherent monochrom atic X-ray beam\, focused by CRL\, impinges on a thin film at a grazing an gle. This converging fan of radiation incoming on a sample surface provide s a range of grazing angles. For each grazing angle\, the rays reflected f rom the front and rear boundaries of the film will interfere\, and as a re sult\, the diffracted intensity in the range of exit angles equal to the a ngular range of the incident fan will generate an interference pattern rep resenting fringes of equal inclination. The capabilities of the new reflec to-interferometer were demonstrated at the ESRF ID06 beamline using X-rays from 10 to 20 keV. The Si3N4 membranes of thicknesses in the range from 1 00 to 1000 nm were studied. Experimentally obtained reflecto-interferogram s correspond well with calculated ones\, and the distance between fringes correspond to the thickness of the tested membranes. While the interferenc e pattern in rather wide angular range is recorded in one shot\, the propo sed approach has a very good temporal resolution\, which is limited to a f ew milliseconds\, depending on the X-ray flux and the sensitivity of the d etector. The high spatial resolution of the interferometer was demonstrate d on interferograms recorded from an 8 nm-thick gold strip deposited on an Si3N4 membrane. It was shown that the interference pattern is very sensit ive even to small deviations in the thickness of the layer. \nIn addition\ , this reflecto-interferometer can be easily adapted for use with the Meta lJet Excillium micro-focus laboratory source\, which has GaKα emission li ne at 9.25 keV. As a result\, a series of interference patterns for test s ample - free-standing thin-film membrane thick of 500 um were observed.\nT he new X-ray reflecto-interferometer opens a wide range of opportunities f or the analysis of thin-film and multilayer systems. The recording of the interference pattern in a single shot allows a fast in-situ analysis of so lid and liquid materials including organic and biological films. The prop osed method has significant advantages compared to classical X-ray reflect ometry\, providing information on the thickness and density of layers or s tructures in real time which allows research with a fundamentally new spat ial and temporal resolution.\n\n1. A. Snigirev\, V. Kohn\, I. Snigireva et al. // Nature\, 384\, 49-51 (1996).\n2. Snigirev\, I. Snigireva // Spring er Series in Optical Sciences\, 137\, 255-285 (2008).\n3. Lyatun\, S.\, et al. Journal of synchrotron radiation 26.5 (2019).\n\nhttps://indico.inp.n sk.su/event/24/contributions/1878/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1878/ END:VEVENT BEGIN:VEVENT SUMMARY:Regularization approach for specific adverse events in processing elemental maps obtained using micro-XRF DTSTART;VALUE=DATE-TIME:20200713T140700Z DTEND;VALUE=DATE-TIME:20200713T140800Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1874@indico.inp.nsk.su DESCRIPTION:Speakers: Dmitry Sorokoletov ()\nMicro-XRF is a promising method to study elemental composition of samples and objects of v arious nature with spatial resolution of tens of microns to tens of nanometers [1]. Application of polycapillary optics for focusing an d (optionally) collecting enables conduction of studies on synchrot ron radiation (SR) sources of the second and higher generation\, the minimum possible spatial resolution limited to values of 10 to 25 microns (effective width of the focus of X-ray lenses\, depen ding on the energy of transmitted radiation) [1].\n\nAt a sufficient ly high signal-to-noise ratio and small scanning step\, one can attain subfocus resolution (i.e.\, its further reduction by a fact or of 2-3 [2]) via processing chemical element distribution maps using deconvolution methods [3]. However\, at operation on second generation SR sources\, this method is applicable for processing maps only for matrix and minor elements (with relative concentratio n of not less than one percent) [4].\n\nWe have developed a regu larization approach for situations with signal noise of medium gra de. This approach correctly takes into account a priori specific information and is aimed at identifying the most general properti es of composition and morphology in micro-areas less than 15 micr ons in size. It was tested and showed a good result for two c haracteristic cases of practical importance\, which arose in proces sing of a series of maps resulting from studies of geological and cosmic samples (e.x.\, [4-5] and so on) using micro-XRF.\n\nThe wo rk was carried out in the framework of the state assignment for Budker INP SB RAS and the RFBR projects no. 19-05-50046\, 18-03-01251 . The work was partly done at the shared research center SSTRC on the basis of the Novosibirsk FEL/VEPP-4-VEPP-2000 complex at BIN P SB RAS\, using equipment supported by project RFMEFI62119X0022.\n\ n[1] I. Mantouvalou\, W. Malzer et al. Spectrochemica Acta Part B. 77\, 2012\, 9-18 [2] D.S. Sorokoletov\, Ya.V. Rakshun\, E.P. Voytovic h et al. Physics Procedia. 84\, 2016\, 295-301\n[3] P. Wrobel\, M. Cz yzycki. Talanta. 113\, 2013\, 62-67\n[4] F.A. Darin\, Y.V. Rakshun\, D.S. Sorokoletov et al. Bulletin of the Russian Academy of Scien ces: Physics. 83\, 2019\, 1433-1436\n[5] F. Darin\, D. Sorokoletov\, Ya. Rakshun et el\, Journal of surface investigation: x-ray\, s ynchrotron and neutron techniques\, 12 (1)\, 2018\, 123-127\n\nhttps:// indico.inp.nsk.su/event/24/contributions/1874/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1874/ END:VEVENT BEGIN:VEVENT SUMMARY:XAFS study of stable bimetallic catalysts for selective hydrogenat ion of furfural DTSTART;VALUE=DATE-TIME:20200713T141800Z DTEND;VALUE=DATE-TIME:20200713T141900Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1870@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Kriventsov ()\n1Kriventsov V.V.\, 1Volodin A.M.\, 1Novgorodov B.N.\, 1Zyuzin D.A.\, 1Aksenov D.G.\, 1Ivanov D.P.\, 2N ikolaev S. A.\, 3Chistyakov A.V.\n\n1Boreskov Institute of Catalysis SB RA S\, Lavrentiev Ave. 5\, Novosibirsk\, 630090\, Russia\n2Faculty of Chemist ry\, Moscow State University\, GSP-1\, 1-3 Leninskiye Gory\, Moscow 1\, 11 9991\, Russia\n3Topchiev Institute of Petrochemical Synthesis RAS\, Lenins ky Pr.\, 29\, Moscow\, 119991\, GSP-1\, Russia\n\n\nThe work was carried o ut in the framework of the RNF project no. № 18-73-10216\, RFBR projects no. 19-05-50046\, 18-03-01251. The work was done at the shared research c enter SSTRC on the basis of the Novosibirsk FEL/VEPP-4-VEPP-2000 complex a t BINP SB RAS\, using equipment supported by project RFMEFI62119X0022.\n\n https://indico.inp.nsk.su/event/24/contributions/1870/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1870/ END:VEVENT BEGIN:VEVENT SUMMARY:An attempt of the quantitative analysis of cyclical constituents i n structure of scanning microfluorescence signals from human hairs DTSTART;VALUE=DATE-TIME:20200713T132800Z DTEND;VALUE=DATE-TIME:20200713T132900Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1871@indico.inp.nsk.su DESCRIPTION:Speakers: Dmitry Sorokoletov ()\, Maria Chernetskaja (Busker I NP SB RAS)\nThe distribution of some chemical elements along human hairs i s proved to be an valuable indicator in a range of various cases. It may s erve in order to use in medicine\, toxicology\, criminalistics\, forensic\ , archaeologics\, and so on [1]. However at the present any systematical s tudies focusing to analysing these distribution with submillimetrical and tens micron spacial resolution do not exist. We took an attempt to describ e qualitatively as well as to test an possibility of the analyse in detail such distributions on the example of the limited sample (consisting of fr agments of 5 human hairs).\n Our work was partitioned by two parts: panora mical and quantitative. The first part allowed to identify three main type s of superposing legible pseudoperiodical cyclical components of elemental distribution for all studied hairs. The diapason of all crutial parameter s of needed scanning experiments that is optimal for applied equipment for ability to process the results (cycles and correlation] between elemental signals) by statictical methods with a good quality was also found. The e xistence of an amount of strong limitations of these parameters are fully explained by the specifics of using synchrotron radiation sources of secon d generation. We can assume that this obstacle results in the existence of some principal limits for ability to process a detail analysis of human h airs (those are also characteristic for any case of applying a similar equ ipment).\n In the second part of this work we selected a concrete distribu tion of fluorescent signal from the sulfur with sufficiently acceptable re lation «signal to noise». Two special mathematical methods of analysing time series were applied successfully for a detail analysis of the cyclica l part of the signal. The algorithm «Hilbert-Huang transformation (HHT) » [2] found 4 pseudoperiodical constituents\, the algorithm «Singular S pectrum Analysis (SSA)» [3] found 5 preudoperiodiс constituents. The sum of all found components is equal initial signal despite of a normally dis tributed stochastic noise with very good quality. The shapes of the cyclic al components differ from approximating cosines by 10-30 % in average (unt il 40-50 % for singular points) for different constituents. The small amou nt of determinated pseudoperiodical components may be explained by human m ethabolizm intraday cycles as well as the characteristic features [1] of t he hair structure.\n The scanning experiments were carried out at Synchrot ron and Terahertz Research (INP SB RAS\, Novosibirsk) and the Kurchatov Co mplex of Synchrotron-Neutron Research (KISI\, Moscow) using a confocal X-r ay microscope. The work was carried out in the framework of the RFBR proje cts no. 19-05-50046. The work was partly done at the shared research cente r SSTRC on the basis of the VEPP-4-VEPP-2000 complex at BINP SB RAS\, usin g equipment supported by project RFMEFI62119X0022.\n[1] Hair in Toxicology . An Important Bio-monitor. \nEdited by Desmond John Tobin. The Royal Soci ety of Chemistry 2005\n[2] https://www.mathworks.com/help/signal/ref/hht.h tml\n[3] https://www.gistatgroup.com/cat\n\nhttps://indico.inp.nsk.su/even t/24/contributions/1871/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1871/ END:VEVENT BEGIN:VEVENT SUMMARY:Self-aligned single exposure deep x-ray lithography DTSTART;VALUE=DATE-TIME:20200713T133300Z DTEND;VALUE=DATE-TIME:20200713T133400Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1045@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Nazmov (Budker Institute of Nuclear Physics )\nMicrodevices are usually made up of several interacting components that can be assembled on the basis of 3-dimensional LIGA structures\, using va rious techniques to fulfill the required positioning accuracy - the so-cal led combined LIGA technology [1]. As a part of the LIGA technology\, deep X-ray lithography enables the formation of 3-D microstructures of signific ant size in each of the three dimensions\; however\, it is often possible to improve positioning accuracy by using self-alignment technique when pat terning with the use of X-ray mask\, as shown in [2]. In our work\, we con sider single-exposure with self-alignment technique for the creation of mi crodevices of technological material\, which can demonstrate new physical capabilities. \n \n[1] LIGA and Its Applications\, Ed.V. Saile\, U. Wal lrabe\, O. Tabata\, J G. Korvink\, 2008\, Wiley‐VCH Verlag\, Weinheim. \n \n[2] V.Nazmov\, E.Reznikova\, M.Boerner\, J.Mohr\, V.Saile\, A.Snigi rev\, I.Snigireva\, M.DiMichiel\, M.Drakopoulos\, R.Simon\, M.Grigoriev\, Refractive lenses fabricated by deep SR lithography and LIGA technology fo r X-ray energies from 1 keV to 1 MeV. AIP Conf. Proc.\, 705(2004)752-755.\ n\nhttps://indico.inp.nsk.su/event/24/contributions/1045/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1045/ END:VEVENT BEGIN:VEVENT SUMMARY:A range of intuitive discretization schemes to accelerate algorith ms for solving deconvolution problems without loss of accuracy DTSTART;VALUE=DATE-TIME:20200713T134100Z DTEND;VALUE=DATE-TIME:20200713T134200Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1873@indico.inp.nsk.su DESCRIPTION:Speakers: Dmitry Sorokoletov ()\nA discretized inverse prob lem of deconvolution with single- or multi-dimensional Gaussian fun ction as the apparatus function [1] is found in a number of op tical and spectroscopic applications. Because of its instability [1 \, p. 12\; 2\, p. 32-37]\, it is necessary to reduce it to som e regularized analogue [1\; 2\, p. 47]\, after which it can be solved by common methods for solving linear systems of equations or optimization.\n\nThe so-obtained result has a meaning of approxi mate solution\, signal noise influence filtered by certain superimpo sition of special restrictions\, either on the solution or on pa rameters of its search. The value of the key parameter of regula rization method applied [2\, p. 47]\, in turn\, should be selecte d according to known principles. Proper selection [1\, p. 55-61\; 2\, p. 66] of the key parameter reduces the signal noise contr ibution to the solution to the lowest possible level with maximum possible preservation of signal information and compliance of it s a priori set properties\, if any.\n\nDespite the uniqueness of r esult obtained by the chosen regularization method at specific imp lementations of signal noise and values of its key parameter\, t here remains the problem of competition of various regularized sol utions. It consists in the fact that selection of different regul arization methods\, their auxiliary parameters\, and implementation of signal noise can yield solutions that formally have comparable explanatory power\, but differ in their features. An effective w ay to overcome this is the use of global optimization methods a nd genetic algorithms. Application of these methods radically incre ases the time required for calculations\, and hence methods for further acceleration of solving the deconvolution problem\, if poss ible\, are in demand.\n\nWe have developed a number of techniques that may enable acceleration of solving discretized problems of d econvolution without significant loss of accuracy regardless of th e regularization method. We considered specific examples to show that application of alternative schemes for improving discre te approximation of deconvolution problem and reducing its dimensio nality (involving non-standard methods of interpolation and taking edge effects into account [1\, p. 35]\, as well as breaking th e separation problem into many equivalent subproblems) makes it po ssible to accelerate computing processes\, at least when obtain ing solutions of a certain class.\n\nThe work was carried out in the framework of the state assignment for Budker INP SB RAS and RFBR project no. 19-05-50046. The work was done at the shared research center SSTRC on the basis of the Novosibirsk FEL/VEPP-4- VEPP-2000 complex at BINP SB RAS\, using equipment supported by pr oject RFMEFI62119X0022.\n\n[1] Hansen P. C.\, Nagy J. G.\, O'Leary D. P. Deblurring Images\, Matrices\, Spectra\, and Filtering. SI AM\, Philadelphia\, 2006. 130 p.\n[2] Leonov A.S. Solving ill-posed inverse problems. Outline of the theory\, practical algori thms and demonstrations in Matlab (in Russian). 2nd ed. M.: "LIBROKOM " Book House\, 2012. 336 p.\n\nhttps://indico.inp.nsk.su/event/24/contri butions/1873/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1873/ END:VEVENT BEGIN:VEVENT SUMMARY:The first results of measuring XAFS spectra in the soft X-ray rang e at KOSMOS station DTSTART;VALUE=DATE-TIME:20200713T134200Z DTEND;VALUE=DATE-TIME:20200713T134300Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1875@indico.inp.nsk.su DESCRIPTION:Speakers: Anton Nikolenko (Budker INP SB RAS)\, Mikhail Syrokv ashin (NIIC SB RAS)\nXAFS spectra were measured near the K edges of the ab sorption of phosphorus\, sulfur\, and L III absorption edges of molybdenum and niobium (2100 - 2700 eV). The measurements were carried out using an upgraded Si (111) dual-crystal monochromator in normal incidence geometry. The monochromator device is described. The main difficulties arising in t he course of obtaining spectra are discussed. It is shown that the spectra l resolution of the monochromator allows one to obtain XAFS spectra\, the quality of which is sufficient to decipher the structure of the sample. Th e measurement was carried out with a partial funding from the Russian Scie nce Foundation (project No. 18-03-01061).\n\nhttps://indico.inp.nsk.su/eve nt/24/contributions/1875/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1875/ END:VEVENT BEGIN:VEVENT SUMMARY:Characteristic of the BiTeCl electronic structure by resonant phot oemission DTSTART;VALUE=DATE-TIME:20200713T142000Z DTEND;VALUE=DATE-TIME:20200713T142100Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1880@indico.inp.nsk.su DESCRIPTION:Speakers: Yulia Khatchenko (M.N. Miheev Institute of Metal Phy sics of UB RAS\, 18 S. Kovalevskaya Str.\, Ekaterinburg\, 620108\, Russia) \nThe aim of this work is an experimental study of the electronic interact ion in the BiTeCl compound and its effect on the formation of the electron ic structure. The used method of resonant x-ray photoemission spectroscopy (RPES) allows distinguishing the contributions of the various components to the valence bands. We can study not only the ground state\, but also th e characteristics of excited two-particle states\, the reaction to externa l action\, and the relaxation processes of the electronic system. \nBiTeCl has a hexagonal crystal structure of alternating layers of chlorine\, bis muth and tellurium atoms. The crystal has no inversion symmetry due to the continuous stacking order of the three atomic layers. The weak bonding be tween the Te and Cl layer provides a natural cleaving plane in the (0001) plane. The BiTeCl crystal was grown based on BiCl3–Bi2Te3. The telluride compound was obtained by fusing stoichiometric amounts of elemental Bi an d Te at 600 ◦C. BiCl3 was prepared by the evaporation of a saturated sol ution of Bi2O3 in HCl acid. The charge was then sealed in a growth quartz ampoule under a pressure of 10−3 Torr. After heating to 430 ◦C at a ra te of 20 ◦C h−1 followed by 1 day of soaking at this temperature the m elt was crystallized by a modified Bridgman method [1]. According to our x -ray diffraction analysis a major part of the aggregate consisted of the B iTeCl phase\, which was selected for the RPES measurements.\nThe experimen ts were carried out at the Russian–German laboratory of the BESSY II syn chrotron (Berlin). The RPES spectra were obtained using synchrotron radiat ion with 150–900 eV photon energy range. The energy resolution was 0.1 e V. The perfect working surface was prepared by cleaving the samples direct ly in the ultrahigh vacuum chamber of the spectrometer. The main regularit ies that appear when the excitation energy and the photoionization cross-s ection change were established.\n\n\n\nThe reported study was funded by RF BR\, project number 19-29-12061 and was carried out within the state assig nment of Ministry of Science and Higher Education of the Russian Federatio n (theme “Spin” No. АААА-А18-118020290104-2 and АААА-А19-119 081990020-8).\n\nhttps://indico.inp.nsk.su/event/24/contributions/1880/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1880/ END:VEVENT BEGIN:VEVENT SUMMARY:Test results of the 7 T superconducting solenoid for THz laser spe ctroscopy DTSTART;VALUE=DATE-TIME:20200713T135300Z DTEND;VALUE=DATE-TIME:20200713T135400Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1791@indico.inp.nsk.su DESCRIPTION:Speakers: Alexey Bragin (Budker Institute of Nuclear Physics)\ nThis project is related to new spectroscopy method in less researched THz range. The method is founded on using of a free electron laser with high spectral power radiation which can be smoothly tuned in desirable range of spectrum. The objects of research of this method are fast processes in ph ysics\, chemical and biological reactions. Uniform magnetic field of 6 T v alue in the research area can considerably increase possibilities of this method. The magnetic field will modulate free induction decay (FID) radiat ion of molecules on characteristic frequencies of the Zeeman splitting tha t gives more possibilities of identification of molecules having even weak magnetic momentum. Moreover\, the use of magnetic field allows essentiall y increase sensitivity of this method due to almost complete polarized sep aration of weak measuring FID signals from powerful radiation of the laser .\nThe operational characteristics of the superconducting solenoid providi ng the field up to 7 T will be presented. The magnetic field measurements results will be discussed.\n\nhttps://indico.inp.nsk.su/event/24/contribut ions/1791/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1791/ END:VEVENT BEGIN:VEVENT SUMMARY:Mathematical modeling of thermal loads of x-ray adaptive optics m aterials DTSTART;VALUE=DATE-TIME:20200713T143200Z DTEND;VALUE=DATE-TIME:20200713T143300Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1884@indico.inp.nsk.su DESCRIPTION:Speakers: Maksim Korobenkov (Immanuel Kant Baltic Federal Univ ersity)\nThe paper presents the results of a study of the thermal loads of materials used in the production of x-ray optics. The development of new types of x-ray studies and the transition to the fourth generation of sync hrotron radiation sources\, which is realized by reducing the emittance of undulator sections\, requires advanced studies of the thermal stability o f the first components of the optical line of the beam. An increase in the radiation power density is a critical problem for the design of the optic al elements of the undulator section\; this is especially important for cr ystalline monochromators with relatively high angles of incidence. However \, other optical elements — windows\, lenses\, slits\, and zoom — are exposed to thermal loads. Therefore\, it is important to consider the effe ct of thermal loads on materials of adaptive x-ray optics to predict not o nly cooling modes\, but also thermal deformations. To this end\, studies h ave been conducted on the interaction of X-rays with the main materials us ed in the production of X-ray optics - aluminum\, beryllium\, diamond and UHMW (ultra high molecular weight polyethylene).\nThe occurrence of therma l gradients occurs due to the absorption of X-rays by the surface of the m aterial (radiant heat transfer) and volume absorption (according to the Bu rer-Lambert law). The problem was solved numerically by the finite element method in the ANSYS Workbench software package. In the framework of the t ask\, the heat flux arising from the interaction of X-ray radiation with t he surface of the substance was set as the boundary condition of heat tran sfer of the second kind. The shape of the heat spot was chosen in the form of a circle with a Gaussian character distribution of the density of ther mal radiation. The interaction of X-rays with a plate of finite size and t hickness was considered. As part of the problem statement\, 3 loading mode s with a characteristic X-ray wavelength were selected: 1\, 0.5\, and 0.25 angstroms.\nThe results of the calculations showed that the use of UHMW a s a material for x-ray optics requires a very careful selection of operati ng modes\, preference should be given to modes with a very low power densi ty of the radiation load. The main heat load is associated with the surfac e absorption capacity of the material\, combined with low thermal conducti vity\, leading to the appearance of a surface heat source that can literal ly burn through the material.\nThe best calculated thermal stability resul ts were shown by diamond plates. In addition to excellent thermal conducti vity\, diamond has a low coefficient of volume attenuation of intensity\, leading to low temperature gradients of the established temperature regime .\n\nhttps://indico.inp.nsk.su/event/24/contributions/1884/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1884/ END:VEVENT BEGIN:VEVENT SUMMARY:Experimental implementation of X-ray powder diffraction by polychr omatic synchrotron radiation in the range of 20-30 keV DTSTART;VALUE=DATE-TIME:20200713T143300Z DTEND;VALUE=DATE-TIME:20200713T143400Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1885@indico.inp.nsk.su DESCRIPTION:Speakers: Boris Tolochko (Institute of solid state chemistry a nd mechanochemistry)\nThe aim of the work is to develop a method that allo ws X-ray phase analysis using a wide synchrotron radiation (SR) spectral b and (polychromatic radiation). This will make it possible to increase the number of photons in the primary beam by 2-3 orders of magnitude and\, acc ordingly\, reduce the time for determining the composition of the sample t o nanoseconds.\n\nThe relationship between the angular dependence of the s cattering intensity of polychromatic radiation and the angular dependence of the scattering intensity of monochromatic radiation by an object is des cribed by the Fredholm equation of the first kind and is an incorrect task . The solution of this equation in the case of significant experimental er rors (which is inevitable in experiments with extremely high time resoluti on) is quite problematic.\nThe idea of the method is to form a sharp short -wavelength boundary in the SR spectrum and approximate the X-ray diffract ion pattern from the polycrystalline sample by the sum of Gaussian peaks\, which allows one to determine the intensities and interplanar distances f rom polychromatic X-ray diffraction patterns using the procedure of minimi zation by peak parameters. Computer model experiments showed that in this case\, the initial values of the peak parameters to minimize are determine d with sufficient accuracy for a successful procedure\, and the errors in determining the interplanar distances and their corresponding intensities are equal in order of magnitude to the errors associated with traditional experiments.\nThe purpose of this work is the experimental implementation of the proposed method\, debugging it on test samples and using fast proce sses to study.\nThe work is aimed at methodological support of the fundame ntal task - obtaining previously inaccessible information about the atomic structure of matter during fast processes (explosion\, solid-phase reacti ons). The results obtained will allow us to determine such process paramet ers as pressure\, temperature\, density and phase composition in the local region (several microns)\, as well as the dynamics of their changes in re al objects.\nTo date\, obtaining direct structural information about the s tate of a substance during fast-moving processes and the dynamics of its c hange has been impossible. This hindered the development of the theory of fast-flowing chemical reactions and processes occurring in matter during t he passage of the front of shock and detonation waves. The use of polychro matic synchrotron radiation (SR) opens up new possibilities and will allow to obtain previously inaccessible information on the kinetics of phase fo rmation in explosion products after passing through a detonation wave.\nSy nchrotron radiation\, as a source of x-ray radiation\, has a number of uni que properties\, the main of which are a large flux intensity\, which allo ws the use of a very short exposure time (\n\nhttps://indico.inp.nsk.su/ev ent/24/contributions/1885/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1885/ END:VEVENT BEGIN:VEVENT SUMMARY:Investigation of the chemical composition of bottom sediments Beri ng Sea DTSTART;VALUE=DATE-TIME:20200713T140000Z DTEND;VALUE=DATE-TIME:20200713T140100Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1802@indico.inp.nsk.su DESCRIPTION:Speakers: Ivan Kirichenko (IGM SB RAS)\nThe chemical compositi on of the bottom sediments of Bering Sea (north-west of the Pacific) was m easured by method of X-ray fluorescence analysis using synchrotron radiati on (SRXRF) at the collective station\, VEPP 3 (Institute of Nuclear Physic s\, SB RAS). Column length is 560 cm. The study of the chemical compositio n of this column is a continuation of large-scale work aimed at studying t he climate of the North Pacific.\nThe aim of the work is to construct seve ral climate change schemes for the Bering Sea and the subarctic of the Pac ific for the characteristic time slices of the last two glacier-ice cycles : the maximum of the last glaciation\, the Marine Isotope Stage 4 (MIS 4)\ , the maximum of the last interglacial glaciation (MIS 5.5)\, the maximum of the penultimate glaciation (Heinrich event 11\, MIS 6.2) and the warmes t possible MIS 6.5. The general characteristic patterns of orbital and mil lennial environmental\, climate and ventilation changes in the Bering Sea and the Pacific subarctic that have occurred during global climate change over the last two glaciation-ice cycles (190-0 thousand years ago) will be established. Analysis of mutual influence of environment and climate para meters between the subarctic of the Pacific Ocean and the Bering Sea over the last 190 thousand years.\nThe experiment is aimed at studying the dist ribution of chemical elements\, markers of paleoclimatic changes along the core of bottom sediments in order to identify orbital and rapid climate c hanges in the last two cycles of glaciation-icing. And also to clarify the role of the region in changes in the palaeoceanology of the world's ocean s and in the interaction of water and atmosphere that had occurred during orbital and millennial climate changes.\nAs part of the work were obtained distributions of chemical elements (from K to Mo for K-series and U\, Th\ , Pb for L-series) along the column under study in 1 cm steps. The conduct ed cluster analysis showed the presence of two large groups of elements. T he first one reflects the terrigenous component of the sediment (K\, Rb\, Nb\, Th\, Y\, Zr\, Mo\, Ti\, Fe\, etc.) and the second - biogenic (Ca\, Sr \, U\, Ge\, As\, Br). In the Fourier and wavelet spectra of the distributi on of the chemical elements were found periodically components comparable with periods of D-O events.\nThis work was supported of the grant "Intera ction of orbital and millennial changes in the environment and hydrology o f the Bering Sea and Sub-Arctic\, Pacific Ocean for the last two cycles of glaciation and glaciation under global climate variations" № 19-05-0066 3\n\nhttps://indico.inp.nsk.su/event/24/contributions/1802/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1802/ END:VEVENT BEGIN:VEVENT SUMMARY:Discovery of the scale effect of the dependence of the mass of sol id detonation products on the mass of explosives in "in situ" explosive ex periments on synchrotron beams VEPP-4 DTSTART;VALUE=DATE-TIME:20200713T143500Z DTEND;VALUE=DATE-TIME:20200713T143600Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1891@indico.inp.nsk.su DESCRIPTION:Speakers: Ivan Rubtsov (Lavrentyev Institute of Hydrodynamics of the Siberian Branch of the Russian Academy of Sciences)\nA unique insta llation\, the only one in the world\, was commissioned - an experimental s ynchrotron radiation station at the VEPP-4 accelerator complex: “Investi gation of the extreme state of matter” [1]. According to the characteris tics of the conducted experiments\, the station has no analogues in the wo rld. The new station made it possible to obtain unique in situ data on the dynamics of the formation of detonation products of large explosive charg es (up to 200 grams) of TNT - RDX.\nThe investigated explosive charges wer e cast TG samples (𝜌 ≈1.7 g / cm3) with a diameter of 20\, 30\, 40 an d a length of 55 mm. Initiation was carried out by the EDV-1 electric deto nator through a plane wave generator (20 mm in diameter) and an intermedia te charge of P-84 with a length of 5 mm and a corresponding diameter. Afte r the electric detonator\, a contact sensor was installed to stop the reco rding of the detector.\nThe experimental data obtained in this work are al ready used to take into account the carbon condensation energy behind the chemical reaction zone during detonation of TG charges. They are also impo rtant for constructing physical models of detonation and testing early mod els of the development of detonation processes.\nIn these experiments\, a scale effect was discovered - a nonlinear dependence of the mass of solid detonation products on the mass of explosives. At small charges (10 -50 gr ams)\, the amount of solid detonation products linearly depends on the ini tial explosive mass. With large masses of 50 - 150 grams\, a deviation fro m the linear dependence is observed. This is a large-scale effect - a devi ation from linear dependence.\nThis work was supported by RFBR grants 19-2 9-12045\, 16-29-01050\, 14-03-00770 and Ministry of Science and Education of Russia grant АААА-А17-117030310280-6.\n\n1. Tolochko\, B.P.\, Koso v\, A.V.\, Evdokov\, O.V.\, Zhogin\, I.L.\, Ten\, K.A.\, Pruuel\, E.R.\, S hekchtman\, L.I.\, Aulchenko\, V.M.\, Zhulanov\, V.V.\, Piminov\, P.F.\, N azmov\, V.P.\, Zolotarev\, K.V.\, Kulipanov\, G.N. The Synchrotron Radiati on Beamline 8-b at VEPP-4 Collider for SAXS\, WAXS and Micro Tomography In vestigation of Fast Processes at Extreme Condition of High Temperature and Pressure with Nanosecond Time Resolution (2016) Physics Procedia\, 84\, p p. 427-433. \n2. Shekhtman\, L.\, Aulchenko\, V.\, Kudashkin\, D.\, Kudrya vtsev\, V.\, Pruuel\, E.\, Ten\, K.\, Tolochko\, B.\, Zhulanov\, V. Operat ion of a silicon microstrip detector prototype for ultra-fast imaging at a synchrotron radiation beam. (2020) Nuclear Instruments and Methods in Phy sics Research\, Section A: Accelerators\, Spectrometers\, Detectors and As sociated Equipment\, 958\, № 162655. \n3. Rubtsov\, I.A.\, Ten\, K.A.\, Pruuel\, E.R.\, Kashkarov\, A.O.\, Kremenko\, S.I.\, Voronin\, M.S.\, Shek htman\, L.I.\, Zhulanov\, V.V.\, Tolochko\, B.P.Methods to restore the dyn amics of carbon condensation during the detonation of high explosives (201 9) Journal of Physics: Conference Series\, 1147 (1)\, № 012038.\n\nhttps ://indico.inp.nsk.su/event/24/contributions/1891/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1891/ END:VEVENT BEGIN:VEVENT SUMMARY:Development of photon diagnostic methods for synchrotron radiatio n sources DTSTART;VALUE=DATE-TIME:20200713T134500Z DTEND;VALUE=DATE-TIME:20200713T134600Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1890@indico.inp.nsk.su DESCRIPTION:Speakers: Artem Khegay (BFU)\nSynchrotron radiation is the uni que electromagnetic radiation\, allowing the detailed study of the interna l structure of materials using various non-destructive methods. As is know n\, such radiation is characterized by exceptional brightness and coherenc e\, due to the choice of a specific wavelength or energy\, synchrotron lig ht is used in many diffraction methods [1]. \nExisting technology in parti cle accelerators led to the ultimate characteristics of the synchrotron ra diation source. Further improvement of the storage ring\, namely an increa sing the electron density and an increasing the brightness of light\, beco mes difficult [2]. Today\, 4th generation synchrotron sources considered d iffraction-limited\, since such sources have an electron beam emittance le ss than a photon beam emittance [3]. The transition to synchrotron sources with an ultra-small electron beam opens up new prospects in X-ray diffrac tion methods and coherent imaging. However\, the determination of extremel y small source parameters (for example «SKIF» [4])\, requires a special approach and tools. Therefore\, the diagnosis of such sources becomes an i mportant task.\nThe interest in the diagnosis of synchrotron sources is be cause this tool allows you to accurately determine the parameters of the g enerated X-ray beam. We present a source imaging experiment carried out wi th different detection methods at the ESRF beamline. Photon beam diagnosti cs of a synchrotron radiation source can be divided into two directions: t he direct source imaging method and the interferometric approach. The dire ct imaging method allows you to get an enlarged image of the source using Compound Refractive Lens (CRL) [5-6]\, Fresnel zone plate (FZP) [7]\, or p inhole camera [8]. The use of interference methods gives a complete image of the phase structure of the photon beam. The proposed diagnostic methods are applicable both for the 3rd generation of synchrotron sources and for the 4th generation.\nThis research was supported by the Russian Science F oundation (Project No. 19-72-30009).\n\nReferences: \n[1] Als-Nielsen J.\, McMorrow D. Elements of modern X-ray physics. – John Wiley & Sons\, 201 1. \n[2] P. Elleaume\, et al.\, “Measuring Beam Sizes and Ultra-Small El ectron Emittances Using an X-ray Pinhole Camera” J. Synchrotron Rad. 2 ( 1995) 209.\n[3] Ewald\, F.\, et al. "Vertical emittance measurement at the ESRF." MOPD61\, DIPAC 11 (2011).\n[4] V. Korchuganov\, M. Blokhov\, M. Ko valchuk\, et al.\, Nucl. Instrum. Methods. Phys. Res. A543\, 14 (2005).\n[ 5] Snigirev A. et al. A compound refractive lens for focusing high-energy X-rays //Nature. – 1996. – Т. 384. – №. 6604. – С. 49.\n[6] Ku hlmann M. Hard x-ray microanalysis with parabolic refractive lenses : Bibl iothek der RWTH Aachen\, 2004.\n[7] Snigireva I. et al. Stacked Fresnel Zo ne Plates for High Energy X‐rays //AIP Conference Proceedings. – AIP\, 2007. – Т. 879. – №. 1. – С. 998-1001.\n[8] Thomas C. et al. X- ray pinhole camera resolution and emittance measurement //Physical Review Special Topics-Accelerators and Beams. – 2010. – Т. 13. – №. 2. – С. 022805.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1890/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1890/ END:VEVENT BEGIN:VEVENT SUMMARY:Development of an approach to minimize the effects of x-ray glitch es DTSTART;VALUE=DATE-TIME:20200713T134600Z DTEND;VALUE=DATE-TIME:20200713T134700Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1892@indico.inp.nsk.su DESCRIPTION:Speakers: Nataliya Klimova (Immanuel Kant Baltic Federal Univ ersity\, 236041 Kaliningrad\, Russia)\nThe construction of 4th generation synchrotron sources will make it possible to obtain a fully coherent high- energy x-ray beam with extremely low emittance and high brightness. The us e of effective refractive optics already at the radiation output (front-en d) is necessary to realize all the possibilities and fully reveal the pote ntial of new diffraction-limited sources.\nX-ray refractive lenses (herein after CRL) [1] satisfy the above requirements. Monocrystalline diamond is considered to be an ideal material for CRL\, mainly because of its stabili ty in flow and high reflectivity in the hard X-ray range. Being universal for a wide range of applications\, diamond СRL\, nevertheless\, have a fe ature for application in spectroscopic experiments\, which was noted in a recently published article [2]\, which reported on the observation of inte nsity modulation at certain energies in the transmission spectrum.\nThis i ssue is well known in X-ray spectroscopy and is called “diffraction loss ” or “glitch” [3]. In paper [2\, 4] X-rays were propagating through lenses\, while the transmitted intensity was measured at different energie s. Use of compound refractive lenses\, that were perfectly aligned by stac king in a single plate\, gave us strong diffraction losses\, reducing the outgoing signal by maximal value of 40%. The magnitude of the effect was t hen minimized down to ~ 10% by use of CRLs compiled from individual lenses with different crystallographic orientation. At the same time\, X-ray gli tches did not affect any focal spot’s size or shape while only arousing the darkening of the focal spot at exact energies of X-ray glitches [4]. D espite X-ray glitches\, monocrystalline X-ray optical materials are prefer able than polycrystalline ones. While single crystals only uniformly reduc e the outgoing intensity (i.e.\, gain factor of the lens)\, polycrystallin e materials introduce speckles and distortions to the transmitted wave fro nt. Such negative influence of the inner material limits the resolution an d optical efficiency of X-ray lenses.\nIn [5-6]\, it was found that the sp atial position of the incident X-ray beam (relative to the lens aperture) most strongly affects the intensity and position of the glitches. The valu e of the glitch intensity strongly depends on the thickness of the materia l of the test sample\, which is associated with the effect of attenuation (extinction) i.e. as the thickness of the material increases\, the fractio n of incident radiation diffracts\, which causes a decrease in the intensi ty passing through the lens. Glitches become more pronounced with increasi ng thickness of the material through which the x-rays pass.\nAlthough glit ches are always present in the transmission spectrum of single-crystal mat erials\, based on the data obtained above\, attempts were made to develop approaches to minimize or\, ideally\, get rid of glitches in the spectrum of single-crystal optical elements.\nAn important result of the proposed w ork is a theoretical model\, which was confirmed by the experimental resul ts and which allows predicting the position and strength (intensity) of gl itches if the crystallographic orientation relative to the x-ray beam is k nown with sufficient accuracy. Therefore\, performing calculations for a p recisely positioned single-crystal lens with a known crystallographic orie ntation\, it is possible to choose specific energy intervals where the eff ect of glitches will have a minimal effect.\nThe results and assumptions m ade it possible to start developing a method of getting rid of glitches at each energy using a small lens flap\, which is calculated on the basis of a program that can determine the lens orientation solely from the spectru m of glitches and on the basis of an analytical approach that allows you t o refine the orientation of the crystal and\, probably \, will allow the u se of crystalline lenses for experiments in which it is necessary to chang e the energy of the incident beam.\nHow to avoid glitches (practical guida nce). First current orientation and cell parameter of the lens has to be d etermined. For this energy of several glitches (at least 3) have to be mea sured with high precision. Then the found energies can be fitted using pro posed approach (by tilting possible K0 directions and comparing the result ing spectrum to the measured one). This will allow to assign hkl indexes t o the observed glitches. Next step is to calculate analytically the exact direction of the incident beam and cell parameter\nThis will allow to pred ict with high precision all glitches for current orientation. Next multipl e glitches spectra for different small tilts can be calculated\, so for ea ch energy a tilt with no glitches at that energy can be selected. During t he energy scan the lens has to be tilt into precomputed orientations.\nThe glitches are rather sharp\, so the tilt required to shift a glitch is sma ll. Therefore the efficiency of the lens shouldn’t suffer. The method mi ght require small increase in the lenses thickness to have possibility to tilt the lenses.\nThus\, by performing the sequence of actions indicated i n the developed approach\, the negative impact of glitches can be avoided. \nThis research was supported by the Russian Science Foundation (Project No. 19-72-30009).\nReferences: \n [1] Snigirev A. V. Kohn\, I. Snigireva a nd B. Lengeler\, A compound refractive lens for focusing high-energy X-ray s //Nature. – 1996. – Т. 384. – №. 6604. – С. 49.\n[2] M. Poli karpov\, H. Emerich\, N. Klimova. I. Snigireva and A. Snigirev Diffraction losses in monocrystalline X-ray refractive lenses // Proceedings of SPIE – 2017. – Vol.10235\, – P. 102350H-2.\n[3] G. Turiyanskii\, S. S. Gi zha\, V. M. Senkov\, I. V. Pirshin\, Y. M. Stanishevskii\, Band reject fil tration of the excitation spectrum at energy dispersive X-ray spectroscopy of weak signals // JETP Lett. – 2016\, – Vol. 104\, – P. 417.\n[4] M. Polikarpov\, H. Emerich\, N. Klimova\, I. Snigireva\, V. Savin and A. S nigirev Spectral X-ray glitches in monocrystalline diamond refractive lens es // Physica Status Solidi B – 2018. – Vol.255 – P. 1700229.\n[5] Q. Zhang\, M. Polikarpov\, N. Klimova\, H. B. Larsen\, R. Mathiesen\, Herm ann Emerich\, G. Thorkildsen\, I. Snigireva and A. Snigirev\, Investigatio n of glitches induced by single-crystal diamond compound refractive lenses based on crystal orientation//AIP Conference Proceedings. – 2019. - Vol . 2054. - P. 060007 \n[6] Q. Zhang\, M. Polikarpov\, N. Klimova\, H. B. La rsen\, R. Mathiesen\, H.Emerich\, G. Thorkildsen\, I. Snigireva and A. Sni girev\, Investigation of ‘glitches’ in the energy spectrum induced by single-crystal diamond compound X-ray refractive lenses // Journal of Sync hrotron Radiation. - 2019. – Vol. 26(1). – P. 109-118.\n\n\n---------- \n\nhttps://indico.inp.nsk.su/event/24/contributions/1892/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1892/ END:VEVENT BEGIN:VEVENT SUMMARY:The code for processing of the SRXRF spectra DTSTART;VALUE=DATE-TIME:20200713T140600Z DTEND;VALUE=DATE-TIME:20200713T140700Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1855@indico.inp.nsk.su DESCRIPTION:Speakers: Konstantin Zolotarev (Budker Institute of Nuclear Ph ysics)\nThe X-ray fluorescence (XRF) analysis with using synchrotron radia tion (SR) is a powerful technique for resolving elemental composition of t he different samples with high sensitivity and good special resolution. \ nFor precise quantitative analysis\, the procedure for robust and reliable processing of the XRF spectra is necessary. Especially\, such code is ver y important for realization scanning mode of the XRF analysis for the oper ative treatment big spectral data. \nAs a rule\, the specialized codes fo r conventional XRF systems are not suitable for this aim because of the SR excitation provides a big variety of the analysis modes. Thus\, the propo sal of the code for processing of the SRXRF spectra is very actual.\nThe m odern program libraries provide a simple ways for organizing robust fittin g XRF peaks with keeping a prior data for X-ray lines. In current work the reliable code for estimation of the XRF peaks areas was proposed. Algori thm suitable for calculation net areas of the peaks in the case of series overlapping and in case violation of the mutual intensity ratios of the line in the series due to sample absorption and due to difference in the r egistration efficiency. \nCode was tested in the new beamline for hard XRF analysis was supported by RFBR grant 17-29-05016 офи_м.\n\nhttps://in dico.inp.nsk.su/event/24/contributions/1855/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1855/ END:VEVENT BEGIN:VEVENT SUMMARY:Inverse Compton scattering at collision of electron and photon bea ms with oblique fronts DTSTART;VALUE=DATE-TIME:20200713T132400Z DTEND;VALUE=DATE-TIME:20200713T132500Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1895@indico.inp.nsk.su DESCRIPTION:Speakers: A.A. Tishchenko (National Research Nuclear Universit y MEPhI\, Moscow\, Russia\, National Research Centre “Kurchatov Institut e”\, Moscow\, Russia\, Laboratory of Radiation Physics\, Belgorod Natio nal Research University\, Belgorod\, Russia)\nInverse Compton scattering d ubbed “light undulator” is a known source of x-ray radiation\, bright and intense. Among the perspective directions of research one of the most significant is idea of Debus with co-authors: to use the laser pulse with skew front to increase the time of interaction of the electron and photon beams. The corresponding calculations were performed within classical elec trodynamics. Here\, we calculated this process in the terms of luminosity within quantum electrodynamics. Our results show that the condition sugges ted by Debus et al. for the maximal intensity will not result in the numbe r of the scattered photons compared with the conventional collinear orient ation of the fronts. \nThe study was supported by RFBR\, grant 19-29-12036 .\n\nhttps://indico.inp.nsk.su/event/24/contributions/1895/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1895/ END:VEVENT BEGIN:VEVENT SUMMARY:The study of the aerosol impurities seasonal accumulation in a sno w cover by scanning µXRF-SR. DTSTART;VALUE=DATE-TIME:20200713T140300Z DTEND;VALUE=DATE-TIME:20200713T140400Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1822@indico.inp.nsk.su DESCRIPTION:Speakers: Andrey Darin (Sobolev Institute of Geology and Miner alogy SB RAS)\nSnow cover is an ideal deposition medium in which aerosol p articles of both natural and technogenic origin are fixed and accumulated during the winter period. As a rule\, environmental studies analyze the to tal amount of aerosol accumulated. This paper presents a study of the aero sol accumulation dynamics in the vertical section of snow cover with high spatial (temporal) resolution.\nSampling over the entire height of the sno w cover accumulated during November 2019 - March 2020 was carried out on t he Novosibirsk region territory using polypropylene pipes with a diameter of 100 mm and a length of 1 m. The cores were selected to the entire depth of the snow cover to the base. After that\, the pipe was shut up from bel ow by a tight stopper\, and from above the snow was pressed by the top sto pper to a total core height of 40 cm. This was done to achieve a uniform s now density over the entire core height. Mixing of snow layers did not occ ur. Samples were transported to the laboratory of the IGM SB RAS in a froz en state. The pipes were opened along the sampling axis and placed horizon tally in a plastic box\, cooled with liquid nitrogen. Snow sublimated duri ng the day without the formation of a liquid phase. The solid components r emaining in the pipe were transferred onto a conductive adhesive tape with out disturbing their vertical distribution.\nThe analysis was carried out using the µXRF-SR according to the standard certified method at the exper imental station "Elemental analysis" in the shared research center SSTRC. Experimental conditions: excitation energy 23 keV\, dimensions of the exci ting radiation beam 1.0 mm in height and 10 mm in width of the sample. The scanning step was 1 mm in height of the sample. The distributions of more than 20 rock-forming and trace elements over the sample depth were obtain ed. The data obtained make it possible to calculate the dynamics of aeroso l accumulation. Analysis of individual particles is used to identify their sources.\nThe work was carried out in the framework of the RFBR projects no. 19-05-50046. The work was done at the shared research center SSTRC on the basis of the VEPP-4-VEPP-2000 complex at BINP SB RAS\, using equipment supported by project RFMEFI62119X0022.\n\nhttps://indico.inp.nsk.su/event /24/contributions/1822/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1822/ END:VEVENT BEGIN:VEVENT SUMMARY:X-ray phase-sensitive imaging technique based on a bilens interfer ometer DTSTART;VALUE=DATE-TIME:20200713T140800Z DTEND;VALUE=DATE-TIME:20200713T140900Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1882@indico.inp.nsk.su DESCRIPTION:Speakers: Dmitry Zverev (Immanuel Kant Baltic Federal Universi ty)\nNowadays\, the continuous evolution of synchrotron radiation sources has resulted in a dramatic increase of brilliance and degree of spatial co herence with respect to older designs. The availability of such intense co herent X-ray beams has triggered the development of wave splitting interfe rometers similar to the classical double-slit Young’s experiment [1-4]. The bilens interferometer consisting of two parallel compound refractive l enses (CRL) and characterizing by high efficiency even in hard X-rays is a remarkable demonstration of such optical devices [5].\nIn this work\, the phase-sensitive X-ray imaging technique based on the bilens interferomete r is developed [6]. The essence of the method consists of scanning a sampl e\, which is set upstream of the bilens across the beam of one lens of the interferometer by recording changes in the interference pattern using a h igh-resolution image detector. The proposed approach allows acquiring the absolute value of a phase shift profile of the sample with a fairly high p hase and spatial resolution. The possibilities of the imaging technique we re studied theoretically and experimentally using fibres with different si zes as the test samples at the ESRF ID06 beamline with 12 keV X-rays. The corresponding phase shift profile reconstructions and computer simulations were performed. The experimental results are fully consistent with theore tical concepts and appropriate numerical calculations. Future improvements and applications of the interferometric imaging technique are discussed.\ n\n[1] Leitenberger\, W.\, Kuznetsov\, S. M.\, & Snigirev\, A. (2001). Int erferometric measurements with hard X-rays using a double slit. Optics com munications\, 191(1-2)\, 91-96.\n[2] Lyubomirskiy\, M.\, Snigireva\, I.\, & Snigirev\, A. (2016). Lens coupled tunable Young’s double pinhole syst em for hard X-ray spatial coherence characterization. Optics express\, 24( 12)\, 13679-13686.\n[3] Lyubomirskiy\, M.\, Snigireva\, I.\, Kuznetsov\, S .\, Yunkin\, V.\, & Snigirev\, A. (2015). Hard x-ray single crystal bi-mir ror. Optics letters\, 40(10)\, 2205-2208.\n[4] Suzuki\, Y. (2004). Measure ment of x-ray coherence using two-beam interferometer with prism optics. R eview of scientific instruments\, 75(4)\, 1026-1029.\n[5] Snigirev\, A.\, Snigireva\, I.\, Kohn\, V.\, Yunkin\, V.\, Kuznetsov\, S.\, Grigoriev\, M. B.\, ... & Detlefs\, C. (2009). X-ray nanointerferometer based on si refr active bilenses. Physical review letters\, 103(6)\, 064801.\n[6] Zverev D. \, Snigireva I.\, Kohn V.\, Kuznetsov S.\, Yunkin V.\, Snigirev A.\, (2020 ) X-ray phase-sensitive imaging using a bilens interferometer based on ref ractive optics. Accepted for publication in journal Opt. Express\n\nhttps: //indico.inp.nsk.su/event/24/contributions/1882/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1882/ END:VEVENT BEGIN:VEVENT SUMMARY:Microelemental limitation of lymph nodes structure according to th e X-ray fluorescent analysis with a synchrotron radiation DTSTART;VALUE=DATE-TIME:20200713T140900Z DTEND;VALUE=DATE-TIME:20200713T141000Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1779@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Gorchakov (Novosibirsk University State)\nU nique properties of X-ray fluorescent analysis with synchrotron radiation and classical morphological method allowed to reveal interrelation between the trace elements content and structure of lymph nodes. Belonging of lym ph nodes to different regions is defining in formation of a certain microe lemental profile and features of the microanatomic organization of lymph n odes. Lymph nodes have different functional specialization with prevalence of immune or drainage function and a certain microelemental composition. The inguinal lymph node has active drainage function because of the develo ped sinus system at the maximum of Mn\, Fe\, Zn concentration\; immune fun ction prevails in a tracheobronchial lymph node at the low content of all trace elements\; the mesenteric lymph node has evenly developed drainage a nd immune functions at the maximum of Cu\, Se contents. The content of tra ce elements is considered as the leading mechanism limitation the structur al organization of lymph nodes. Innovative approach helped to reveal forma tion of lymphoid-microelemental association. Features of this association modify the structural organization of lymph nodes depending on localizatio n (region specifics).\n\nhttps://indico.inp.nsk.su/event/24/contributions/ 1779/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1779/ END:VEVENT BEGIN:VEVENT SUMMARY:Transmission Hard X-ray Interferometer-Microscope (15-35 keV) at V EPP-4 storage ring facility as a project DTSTART;VALUE=DATE-TIME:20200713T134700Z DTEND;VALUE=DATE-TIME:20200713T134800Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1897@indico.inp.nsk.su DESCRIPTION:Speakers: Elena Reznikova ()\nA new Transmission Hard X-ray In terferometer-Microscope (THXIM)\, which is based on X-ray refractive lense s and diffractive gratings\, was developed for 15-35 keV photon energies t o set up at the second front-end of VEPP-4M storage ring. The synchrotron radiation (SR) path from the bending magnet source to the experimental hut ch is 17 m. The THXIM block sequence on the SR beam course within the 6.5 m hutch distance is the following: 1) The forvacuum block includes horizon tal and vertical slits\, a multilayered X-ray mirror monochromator\, an SR beam position detector and a blocker absorbing the direct beam. 2) The bl ock of the X-ray refractive condenser lens in the air atmosphere. 3) The b lock of a research object and the X-ray refractive objective lens with X-r ay diffractive gratings is in the air environment. 4) At the end of the be amline station\, the air block of the THXIM detector is disposed\, which i ncludes an X-ray scintillator (a 100 m thin\, 1 cm large area\, CdWO4 c rystal) and an optical microscope with a planapochromate objective\, incli ned mirror and a CCD camera. Between 2\, 3 and 4 blocks\, forvacuum tubes for the beam inflights are disposed. We develop inclined X-ray lithography with SU-8 and PMMA resist\, as well as photo- and e-beam lithography and galvanoplastics technologies of gold\, nickel and aluminum microstructures in order to create X-ray refractive lenses with high aspect ratios of 3D apex elements and X-ray diffractive gratings with nanometer range periods. The X-ray refractive long compound paraboloid objective lenses with 100 m apertures and focal distances of several centimeters provide the THXI M resolution of dozens nanometers. The position choice for a THXIM researc h object within a local coherent zone\, which is obtained by means of an X -ray refractive condenser lens with a long-length focal waist\, is discuss ed.\n\nThis work is partially supported by grant №19-42-540014 of Russia n Foundation for Basic Research and Government of Novosibirsk Region.\n\nh ttps://indico.inp.nsk.su/event/24/contributions/1897/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1897/ END:VEVENT BEGIN:VEVENT SUMMARY:mu-XRF for thick specimens DTSTART;VALUE=DATE-TIME:20200713T134800Z DTEND;VALUE=DATE-TIME:20200713T134900Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1898@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Nazmov ()\nWhen studying samples without de struction by x-ray fluorescence analysis\, the thickness of the investigat ed sample is limited by the depth of total absorption of the outgoing and excitation radiation. When analyzing complex geological objects containing high-Z atoms\, the excitation energy can reach several tens of kiloelectr onvolts\, which can generate x-ray fluorescent light from a depth of sever al hundred micrometers. However\, focused on the front plane of the sample the beam of excitation radiation is defocused at such depth\, and its cro ss-section under the conditions discussed in the report can become signifi cantly larger than the focus size. This effect is especially significant w hen the x-ray source is small\, for example\, for the SKIF synchrotron rad iation source. Based on the geometric model of the actinic voxel\, the con ditions for optimal choice of the excitation energy and focusing condition s of the initial x-ray beam are determined.\nThis work was supported in pa rt by RFBR Grant Number 17-45-540618.\n\nhttps://indico.inp.nsk.su/event/2 4/contributions/1898/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1898/ END:VEVENT BEGIN:VEVENT SUMMARY:Application of XAFS spectroscopy for study of microparticles of Si khote-Alin meteorite DTSTART;VALUE=DATE-TIME:20200713T141400Z DTEND;VALUE=DATE-TIME:20200713T141500Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1864@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Kriventsov ()\nThe presented work shows the new results of a study of microparticles of the Sikhote-Alin meteorite us ing XANES and EXAFS methods. XANES / EXAFS spectra (Ni-K\, Fe-K\, W-L2)\, using μ- and standard methods\, for meteorite microparticles and referenc e comparison samples were obtained both on experimental module X-ray Confo cal Microscopy situated on NRC “Kurchatov Institute” (Moscow) and at X RF-\, EXAFS- stations of Siberian Synchrotron Terahertz Radiation Center ( SSTRC\, Novosibirsk). Some differences in the local structure and phase co mposition in different microparticles of the studied meteorite samples wer e determined. The interatomic distances and the corresponding coordination numbers were calculated. Various options for structural models are consid ered. Additionally\, the chemical and phase compositions\, and the morphol ogy of the samples were studied by SEM\, EDX\, and XRF methods. On the exa mple of a test meteorite\, the possibilities of the proposed approach for the study of microparticles of complex composition are shown. The data obt ained by all the methods are in a good agreement.\nThe work was carried ou t in the framework of the RFBR projects no. 19-05-50046\, 18-03-01251. The work was done at the shared research center SSTRC on the basis of the Nov osibirsk FEL/VEPP-4-VEPP-2000 complex at BINP SB RAS\, using equipment sup ported by project RFMEFI62119X0022.\n\nhttps://indico.inp.nsk.su/event/24/ contributions/1864/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1864/ END:VEVENT BEGIN:VEVENT SUMMARY:High resolution monochromator for synchrotron radiation based on f lat VLS-gratings DTSTART;VALUE=DATE-TIME:20200713T141700Z DTEND;VALUE=DATE-TIME:20200713T141800Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1869@indico.inp.nsk.su DESCRIPTION:Speakers: Alexey Shatokhin ()\nWe present the design of a high -resolution plane-VLS-grating soft X-ray and VUV monochromator of synchrot ron radiation for the 125 – 4200 Å spectral range. A concave mirror is located at a distance of 28 m from a synchrotron radiation source. The mir ror is set in a highly asymmetric scheme and focuses radiation at a distan ce of about 1350 mm. The VLS-grating is set close to the mirror and focuse s onto the exit slit the radiation diffracted in the first external order. The frequency is scanned by rotation of only the plane VLS grating. Two r eplaceable VLS-gratings with line densities of 600 1/mm and 150 1/mm are p lanned for the 125 – 1000 Å and 900 – 4200 Å spectral ranges\, respe ctively. The ruled area of the VLS gratings is 40x20 mm. The gratings and the mirror each operate for a deviation angle of 32˚\, the total deviatio n angle being equal to zero. The resolving power obtained by numerical ray tracing is higher than 2000 in the entire spectral range. This work was p artially supported by RFBR grant No.19-12-50059\n\nhttps://indico.inp.nsk. su/event/24/contributions/1869/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1869/ END:VEVENT BEGIN:VEVENT SUMMARY:Structural study of mono- bimetallic catalytic nanosystem by XAFS DTSTART;VALUE=DATE-TIME:20200713T141900Z DTEND;VALUE=DATE-TIME:20200713T142000Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1872@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Kriventsov ()\n1Kriventsov V.V.\, 1Volodin A.M.\, 1Novgorodov B.N.\, 1Zyuzin D.A.\, 1Aksenov D.G.\, 1Ivanov D.P.\, 2I ost K.N.\, 2Shlyapin D.A.\, 3Nikolaev S. A.\, 4Chistyakov A. V.\, 4Tsodiko v M.V.\n\n1Boreskov Institute of Catalysis SB RAS\, Lavrentiev Ave. 5\, No vosibirsk\, 630090\, Russia\n2Center of New Chemical Technologies BIC\, Ne ftezavodskaya St.\, 54\, Omsk\, 644040\, Russia \n3Faculty of Chemistry\, Moscow State University\, GSP-1\, 1-3 Leninskiye Gory\, Moscow 1\, 119991\ , Russia\n4Topchiev Institute of Petrochemical Synthesis RAS\, Leninsky Pr .\, 29\, Moscow\, 119991\, GSP-1\, Russia\n\n\nThe work was carried out in the framework of the RFBR projects no. 19-05-50046\, 18-03-01251. The wor k was done at the shared research center SSTRC on the basis of the Novosib irsk FEL/VEPP-4-VEPP-2000 complex at BINP SB RAS\, using equipment support ed by project RFMEFI62119X0022.\n\nhttps://indico.inp.nsk.su/event/24/cont ributions/1872/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1872/ END:VEVENT BEGIN:VEVENT SUMMARY:Determination of the state of the active component of nanocomposit e model metal-carbon catalysts by XAFS method DTSTART;VALUE=DATE-TIME:20200713T142100Z DTEND;VALUE=DATE-TIME:20200713T142200Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1899@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Kriventsov ()\nThis report shows the result s of XAFS (XANES/EXAFS) research on the state and local structure of metal s in the active component of model low-percentage metal-carbon nanocomposi te catalysts containing nanoscale forms of Pt\, Pd\, Ru. It is a well-know n fact that low-percentage catalytic nanosystems containing platinoids dep osited on various carbon carriers are of great interest to researchers bec ause of their practical significance\; possibilities for varying catalytic properties and applications for a wide range of processes (hydrogenation\ , conversion of industrial substrates\, debenzylation of amines\, etc.).)\ , low cost of final products\, ease of disposal and recovery of expensive components from spent catalysts. Model samples were prepared from precurso rs of different nature\, with varying methods of synthesis and formation o f the applied component\, recovery and activation modes. XAFS (XANES/EXAFS ) spectra (Pt-L3\, Pd-K\, Ru-K) of studied samples were recorded at SSTRC\ , Novosibirsk. The lengths of interatomic bonds and the corresponding coo rdination numbers are established. Additionally XPS\, TEM\, XRD\, XRF meth ods were applied to study chemical and phase compositions\, morphology of the samples. Data obtained by different methods do not contradict each oth er. Possible variants of structural models are considered in detail. Corre lations were found between the structure of the active component and the c atalytic properties of the studied samples. The perspective of the propose d approach for the study of nanocomposite model metal-carbon catalysts con taining platinoids is shown.\nThe work was carried out in the framework of the RFBR projects no. 19-05-50046\, 18-03-01251. The work was done at the shared research center SSTRC on the basis of the Novosibirsk FEL/VEPP-4-V EPP-2000 complex at BINP SB RAS\, using equipment supported by project RFM EFI62119X0022.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1899/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1899/ END:VEVENT BEGIN:VEVENT SUMMARY:Structural study of bimetallic catalytic nanosystems containing pr ecious metals by XAFS spectroscopy DTSTART;VALUE=DATE-TIME:20200713T142200Z DTEND;VALUE=DATE-TIME:20200713T142300Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1900@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Kriventsov ()\nThis work presents the resul ts of a study of the local structure of the active component of mono-\, bi -metallic low-percentage (~1%) catalysts (containing Pt\, Au\, Pd\, Ru) st abilized on oxide carriers using XAFS method (XANES/EXAFS). Studying the n ature of nano-forms of noble metal stabilization is promising for creating effective catalysts for various applications\, including catalytic system s for alternative energy applications. The development of synthesis method s can lead to a significant economic gain\, due to the reduction of the me tal content and optimization of the catalytic properties of the system. Mo del catalysts were prepared from mono-and bimetallic complexes\, with vary ing synthesis methods: sol-gel\, ion exchange\, impregnation\, reducing mo des\, and the nature of carriers. XAFS (XANES/EXAFS) spectra (Pt-L3\, Au-L 3\, Pd-K\, Ru-K) of studied samples were recorded at SSTRC\, Novosibirsk. Genesis of the local structure of the active component was studied\, inclu ding the study of oxidized precursors and catalysts after reducing and act ivation. It is established that depending on the background\, it is possib le to form various nanoscale forms of noble metals localized on the surfac e of the oxide carrier. Additionally\, the samples were studied by XRD\, X PS\, XRFA\, HRTEM. Variants of possible structural models are considered i n detail.\nThe work was carried out in the framework of the RFBR projects no. 19-05-50046\, 18-03-01251. The work was done at the shared research ce nter SSTRC on the basis of the Novosibirsk FEL/VEPP-4-VEPP-2000 complex at BINP SB RAS\, using equipment supported by project RFMEFI62119X0022.\n\nh ttps://indico.inp.nsk.su/event/24/contributions/1900/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1900/ END:VEVENT BEGIN:VEVENT SUMMARY:STUDY THE DIAMOND THIN MEMBRANES BY X-RAY REFLECTOR-INTERFEROMETER Y AT THE ESRF BEAMLINE ID10 DTSTART;VALUE=DATE-TIME:20200713T143600Z DTEND;VALUE=DATE-TIME:20200713T143700Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1893@indico.inp.nsk.su DESCRIPTION:Speakers: Svetlana Lyatun (Immanuel Kant Baltic Federal Univer sity)\nToday\, the combination of new generation X-ray sources with modern optical elements gives a strong impetus to the development of new researc h methods\, and to improve the classical methods. One such method is X-ray reflectometry (XRR). Despite the widespread use for thin-film structures study\, XRR has a strong limitation related with the size and surface qual ity of the samples.\nRefractive optics is the most dynamically developing kinds of X-ray optical elements [1-2]. CRLs quickly gained popularity amon g synchrotron sources users due to their ease of operation and the possibi lity of application in a wide range of energies [3-4].\nIn this work\, a n ew X-ray reflecto-interferometer (XRI)\, based on CRL\, was demonstrated t o study thin-film structures using the synchrotron X-ray source [5]. Due t o the CRL focusing properties\, X-rays incident on the sample surface cont ain the necessary range of angles for the formation of an interference pat tern in one shot.\nThe capabilities of the new XRI were demonstrated at th e ESRF ID10 beamline (Grenoble\, France). The Si3N4 and diamond membranes with thicknesses 100 and 200 nm were studied using X-rays of energy 22 keV . Experimentally obtained reflecto-interferograms are in good agreement wi th calculated ones\, and the distance between fringes in the interference patterns corresponds to the thickness of the tested membranes.\nThe new XR I opens wide horizons both for rapid thin-film and multilayer analysis and for studying the dynamics of processes on the surface and in the depth of the sample\, as well as for studying complex structured and biological sa mples.\nThis research was supported by the Russian Science Foundation (Pro ject No. 19-72- 30009). \n\n[1] Snigirev\, V. Kohn\, I. Snigireva and B. L engeler\, Nature\, vol. 384\, 49-51 (1996)\n[2] Snigirev\, I. Snigireva\, Springer Series in Optical Sciences\, vol. 137\, 255-285 (2008)\n[3] Snigi rev\, V. Kohn\, I. Snigireva\, et.al.\, Appl. Opt.\, 37\, 653-662 (1998)\n [4] Bosak\, I. Snigireva\, K. S. Napolskii\, A. Snigirev\, Adv.Mater.\, 2 2\, 3256–3259 (2010)\n[5] Lyatun\, S.\, Zverev\, D.\, Ershov\, P.\, Lyat un\, I.\, Konovalov\, O.\, Snigireva\, I.\, & Snigirev\, A. (2019). X-ray reflecto-interferometer based on compound refractive lenses. Journal of sy nchrotron radiation\, 26(5).\n\nhttps://indico.inp.nsk.su/event/24/contrib utions/1893/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1893/ END:VEVENT BEGIN:VEVENT SUMMARY:THE RESEARCH OF STRUCTURE AND MORPHOLOGY OF POWDER TYPE D-16 AND M ATERIAL ON IT’S BASIS OBTAINED BY METHOD OF 3D PRINTING DTSTART;VALUE=DATE-TIME:20200713T130000Z DTEND;VALUE=DATE-TIME:20200713T130100Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1021@indico.inp.nsk.su DESCRIPTION:Speakers: Danil Eselevich (ISSC UB RAS)\nAluminum alloys with copper as a structural material are widely used in various fields of indus try. Currently\, there is growing significant interest in the method of 3D printing of products based on ferrous and non-ferrous metal alloys using selective laser fusion (SLS) technology. In addition to choosing the type of laser and the parameters of the manufacturing process\, the quality of the materials obtained is influenced by the physicochemical properties of the initial powder (the stability of oxide films on the surface of particl es\, the tendency to form low melting phases\, etc.). \nThe structure of the surface and volume of a 3D product obtained by the method of selectiv e laser alloying from a powder of alloy D-16 was studied. It was found by the XPS method that on the surface of the sample there is an Al2O3 layer a bout 3 nm thick\, and below it an Al-Cu metal alloy with a copper content of ~ 5 mass. %\, which coincides with the EDX analysis performed on the in itial powder by scanning electron microscopy. Local areas with a high copp er content (up to 13 at. %) were found at the grain boundaries of the crys tals. A high porosity of the fused sample was established (5-6%)\, which i s almost two times higher than permissible for materials obtained by the S LS method. This is due to the crystallization features of Al-Cu system all oys associated with the transfer of matter along the interfaces\, as well as to non-optimal 3D printing conditions. \nIt is of interest to study t he physicochemical properties of D-16 powder at a synchrotron radiation so urce. \nThe research was carried out within the state assignment of FASO of Russia (theme № АААА-А19-119031890028-0)\n\nhttps://indico.inp. nsk.su/event/24/contributions/1021/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1021/ END:VEVENT BEGIN:VEVENT SUMMARY:Numerical simulation of the interaction of terahertz waves with di ffraction metal gratings and conditions for the generation of surface plas mons DTSTART;VALUE=DATE-TIME:20200713T135400Z DTEND;VALUE=DATE-TIME:20200713T135500Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1805@indico.inp.nsk.su DESCRIPTION:Speakers: Oleg Kameshkov ()\nIn the terahertz plasmonics\, it is widely used wavelength 1D grooved metal gratings for excitation of surf ace plasmon polaritons (SPPs). SPPs are traveling charge density waves at the surface of conducting materials. Since these modes have a non-radiativ e nature\, it is possible to excite them only if the configuration providi ng the wavevector-matching condition between the incident light and SPP di spersion law. The wavelength gratings are the most suitable and cheaper so lution to satisfy this requirement. The careful optimization of the most suitable experimental parameters by the numerical simulations leads to the enhancement of surface plasmon resonance response. In this paper\, numeri cal results of grating optimization with different groove profiles are dis cussed. The work was supported by RSF grant 19-12-00103\n\nhttps://indico. inp.nsk.su/event/24/contributions/1805/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1805/ END:VEVENT BEGIN:VEVENT SUMMARY:EFFECT OF TiOy STOICHIOMETRY ON THE STRUCTURE OF TiOy/HAP NANOCOM POSITE DTSTART;VALUE=DATE-TIME:20200713T132700Z DTEND;VALUE=DATE-TIME:20200713T132800Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1025@indico.inp.nsk.su DESCRIPTION:Speakers: Danil Eselevich (Institute of Solid State Chemistry UB RAS)\nComposite materials based on hydroxyapatite (HAP) are of much int erest for biology and medicine owing to their bioactivity. The advanced st rength properties of HAP can be achieved by its reinforcement with dispers ed titanium and titanium oxide particles. This makes it possible to combin e biocompatibility with high mechanical strength and fracture toughness. \nThe structure of initial TiOy nanopowders and nanocomposite materials H AP/TiOy with different stoichiometry (TiO0.92 and TiO1.23) has been studie d. The XRD\, IR and Raman spectroscopy methods were used to establish the dependence of the shift and relative intensity of bands in the region of 1 44–151 cm–1 in Raman spectra on the relative content of vacancies and Ti-O bond length. Depending on the stoichiometry of additive during heat t reatment\, surface groups [Ti(OH)2]2+ and [TiHPO4]2+ are formed on interfa ces of matrix and reinforcing additive nanoparticles\, partial cationic he terovalent substitution of Ti3+ and Ti4+ for Ca2+ takes place\, and new ph ases\, in particular Ti4.5O5 and TiO2\, are formed. The stoichiometry of a dditives affects the initial process of formation of new phase\, the phase composition of nanocomposites at different annealing stages\, as well as the physical properties of final product. \nOf interest are the in situ studies of the physicochemical properties of HAP/TiOy nanocomposites on a synchrotron radiation source\, which can provide an insight into the pecul iarities of interaction of additives with the matrix and the sequence of p hase formation when nanoparticles come in contact. \nThe reported study was funded by RFBR\, project number 20-03-00675.\n\nhttps://indico.inp.nsk .su/event/24/contributions/1025/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1025/ END:VEVENT BEGIN:VEVENT SUMMARY:W-containing PMMA-based nanocomposite DTSTART;VALUE=DATE-TIME:20200713T133100Z DTEND;VALUE=DATE-TIME:20200713T133200Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1038@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Nazmov (BUdker Institute of Nuclear Physics )\nThe development of polymer nanocomposites has been an area of ​​adv anced scientific and industrial interests in the last ten years in connect ion with advances in improving the properties of materials based on a comb ination of a polymer matrix and\, as a rule\, inorganic nanomaterial. As a result\, new materials are formed with improved properties such as mechan ical resistance\, strength and stiffness\, electrical conductivity and the rmal conductivity\, increased flame retardant properties\, lower diffusion coefficient of vapors and gases. Nanocomposites can also demonstrate uniq ue engineering capabilities that guarantee the benefits of creating functi onal materials with desired properties for specific applications. Therefor e\, it is promising to use new materials in micromachining to obtain funct ional microstructures. Some micromachining technologies are based on the u se of photo and electronic resists\, which are just an organic polymer or prepolymer\, and the introduction of inorganic particles into it increases the chemical and thermal stability and mechanical stability of microstruc tures. One of the promising applications of LIGA technology is the formati on of an X-ray detector with high spatial resolution. The introduction of inorganic particles of the inorganic particles of the GdO2S2 scintillator with a grain size of several microns into the technological layer of the r esist promotes the conversion of X-ray radiation\, but significantly limit s the spatial resolution. On the other hand\, large particles scatter the generated radiation in the visible range of the spectrum. Therefore\, we h ave developed a method of in-situ polymerization of dispersing PMMA partic les of submolecular size into an electronic resist\, which stimulate the t ransformation of X-ray radiation into visible-spectrum radiation. The resu lts of the resulting X-ray detector based on a polymer nanocomposite are r eported in this report. This work is partially supported by RFBR grant № 19-42-540014.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1038/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1038/ END:VEVENT BEGIN:VEVENT SUMMARY:Technical and software improvements of the EPR spectroscopy statio n at the NovoFEL facility: status 2020. DTSTART;VALUE=DATE-TIME:20200713T135000Z DTEND;VALUE=DATE-TIME:20200713T135100Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1009@indico.inp.nsk.su DESCRIPTION:Speakers: Anatoly Melnikov (International Tomography Center)\n This contribution describes the current state of the X-band EPR setup at t he Novosibirsk Free Electron Laser facility (NovoFEL). Recent advances in experimental hardware and software are discussed in detail. Improvements i nclude implementations of fast detectors for recording the THz macropulses during experiment\, possibility of simultaneous use of two oscilloscopes\ , configured at different timescale\, and the development of software for on-the-fly data treatment. Modification of hardware and software of the EP R spectroscopy station at NovoFEL facility was funded by the Russian Scien ce Foundation\, grant number 17-13-01412. Synthesis of [Co0.01Zn0.99(piv)2 (2-NH2-Py)2] complex was funded by IGIC RAS state assignment.\n\nhttps://i ndico.inp.nsk.su/event/24/contributions/1009/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1009/ END:VEVENT BEGIN:VEVENT SUMMARY:Application of complex studies of test samples for the implementat ion of combined SR methods for the study of micro-objects DTSTART;VALUE=DATE-TIME:20200713T141100Z DTEND;VALUE=DATE-TIME:20200713T141200Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1781@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Kriventsov ()\nThis work shows the results of the study of trial test samples of technological and natural origin\, a nd using a complex composition for the development of combined methods bas ed on synchrotron radiation (SR)\, such as μ-XANES/EXAFS\, μ-XRF\, and o thers. Main goal of the study is to adapt the developed integrated approac h for the study of micro-inclusions and microparticles by SR methods in th e near future. All the spectra of the studied samples were recorded using standard methods\, both at the experimental module of x-ray confocal micro scopy located at NRC “Kurchatov Institute” (Moscow) and at XRF-\, EXAF S- stations of Siberian Synchrotron Terahertz Radiation Center (SSTRC\, No vosibirsk).\nThe studied test samples with a complex composition (such as low-percentage metal oxide nanocomposites\, nanoalloys\, and samples of na tural origin) were synthesized and/or selected from existing collections. Test samples and benchmarks necessary for testing and developing SR techni ques were studied by a set of methods (μ-XANES/EXAFS\, μ-XRF\, XAFS\, XR F\, HRTEM\, XPS\, SEM\, EDX\, etc.). New information about phase and eleme nt compositions\, atomic structure\, morphology\, and structural parameter s was obtained for the test systems under study. The data obtained by all the methods are in a good agreement. The possibilities of the proposed app roach for the study of microparticles and micro-inclusions of complex comp osition by methods implemented using synchrotron radiation are demonstrate d.\nThe work was carried out in the framework of the RFBR projects no. 19- 05-50046\, 18-03-01251. The work was done at the shared research center SS TRC on the basis of the Novosibirsk FEL/VEPP-4-VEPP-2000 complex at BINP S B RAS\, using equipment supported by project RFMEFI62119X0022.\n\nhttps:// indico.inp.nsk.su/event/24/contributions/1781/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1781/ END:VEVENT BEGIN:VEVENT SUMMARY:Calculation of thermal loads of X-ray mirror optics of a synchrotr on radiation source SKIF DTSTART;VALUE=DATE-TIME:20200713T142500Z DTEND;VALUE=DATE-TIME:20200713T142600Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1804@indico.inp.nsk.su DESCRIPTION:Speakers: Nikolay Razumov (Институт химии тве рдого тела и механохимии Со РАН)\nThe work is de voted to the problem of the occurrence of large thermal loads on x-ray opt ics when it is irradiated with a 69 kW synchrotron radiation beam from a s uperconducting wiggler installed on a SKIF synchrotron radiation source. T he task was to reduce the temperature gradient on the surface of the mirro r\, which lead to mechanical thermal stresses and\, consequently\, to geom etric distortions of X-ray mirrors.\nThe task of this work was: 1) calcula tion of the thermal load on X-ray mirror optics when it is irradiated with a synchrotron radiation beam with a power of about 80 kW\, which leads to a temperature gradient and\, accordingly\, to mechanical thermal stresses \, which lead to geometric distortions of X-ray mirrors\; 2) choosing the geometry of the cooling system\; 3) choosing a refrigerant for the cooling system\; 4) optimization of the exposure time of x-ray mirror optics of t he experimental station "Fast processes"\; 5) conducting test (calibration ) experiments to study the heating of elements of X-ray mirror optics on b eams of synchrotron radiation from the wiggler of the VEPP-4 accelerator.\ nIn this work\, we simulate the heating of an X-ray mirror for synchrotron radiation from the SKIF superconducting wiggler\, as well as for the VEPP -4M wiggler. The beam characteristics\, such as power\, divergence\, and s patial distribution\, are calculated. In the calculation of the emission s pectrum\, the SPECTRA program was used. To calculate the passage of synchr otron radiation through the material of filters and mirrors\, as well as t o calculate the reflected spectrum from the mirror at the angle of total e xternal reflection\, the XOP 2.3 program was used. Using the data obtained \, the distribution of the thermal power of the beam in the near-surface l ayer of the mirror was simulated. Further\, using the obtained distributio n and the ANSYS Workbench program\, the local heating of the X-ray mirror under various modeling conditions was calculated\, which made it possible to construct a map of the temperature distribution over the mirror surface .\nA control experiment was carried out to measure the surface temperature of a mirror when irradiated with a SI beam from a VEPP-4 wiggler. This ma de it possible to verify the calculations performed by the ANSYS Workbench codes. In the case of VEPP-4M\, the mirror was cooled convectively by air .\nFor the SKIF wiggler\, computer simulation of radiation heating of a mi rror was calculated for various cases\, both of the cooling geometry and o f various refrigerants\, including liquid nitrogen.\n\nhttps://indico.inp. nsk.su/event/24/contributions/1804/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1804/ END:VEVENT BEGIN:VEVENT SUMMARY:SR-XRFA in Botanical Research: Elemental Composition of Species of the Genus Syringa (Oleaceae) under Technogenic Impact in Novosibirsk DTSTART;VALUE=DATE-TIME:20200713T135900Z DTEND;VALUE=DATE-TIME:20200713T140000Z DTSTAMP;VALUE=DATE-TIME:20260613T121830Z UID:indico-contribution-202-1039@indico.inp.nsk.su DESCRIPTION:Speakers: Elena Khramova (Central Siberian Botanical Gardens\, SB RAS)\nA study has been first made of the element composition of both t he plants of two species of the genus Syringa\, growing under technogenic impact in Novosibirsk and the soil samples from their habitat by method of X-ray fluorescence analysis using synchrotron radiation (SRXRF) at the st ation of element analysis of SCSTR of the Institute of Nuclear Physics SB RAS (VEPP-3 store ring). \nThe material studied was represented by the p lants of two species - Syringa josikaea and S. vulgaris\, represented by t hree cultivars: ‘Nadezhda’\, ‘Olimpiada Kolesnikova’\, ‘Pamjat o Kirove’\, growing in conditions of technogenic impact and background\, collected in August of 2017 in Novosibirsk. \nA comparative analysis of the soil from the points of sampling of plant samples showed an excess in the content of V\, Zn\, Br\, Pb and a decrease in Mn in urban soils compar ed with the background. \nThe study of the content of macro- and microel ements in the aerial organs of representatives of the genus Syringa showed that the concentration of macroelements K and Ca is higher in the leaves than in the stems\, regardless of the taxon and place of growth. \nThe h ighest total content of K and Ca is revealed in the leaves of S. josikaea. It was found that in plants under technogenic impact\, the content of Mn\ , Fe\, Co\, Cr\, Br\, Rb\, Nb increased and Zn and Mo decreased compared t o the control\, the most severe heavy metal pollution in urban conditions was observed in plants of S. josikaea. \nThe biogeochemical transformati on coefficient (Zv) was calculated\, which reflects a violation of the nor mal ratios of elements in the organs of plants as a result of increased an thropogenic load. The most significant changes in the elemental compositio n of lilac leaves under anthropogenic impact were observed in plants of th e species S. josikaea\, whose Zv of leaves is 37.2\, which is 1.3–1.6 ti mes higher than in plants of S. vulgaris. Plants of the ‘Memory of Kirov ’ variety (Zv = 22.8) are most resistant to pollution. \nAs a result\, reliable data were first obtained on the content of 20 elements in sample s of two species of the genus Syringa in the urban ecosystem of Novosibirs k. The species and cultivars that are most tolerant to pollution in urban conditions\, which can be recommended for widespread use in green construc tion\, are identified. The data obtained on the elemental composition of p lant samples and soils may be included in the databases. This work is part ially supported by RFBR grant № 16-44-040204.\n\nhttps://indico.inp.nsk. su/event/24/contributions/1039/ LOCATION: URL:https://indico.inp.nsk.su/event/24/contributions/1039/ END:VEVENT END:VCALENDAR