It is required an ultra-high vacuum (near 10-11 Torr in the beam absence mode) in the synchrotron source of 4+ generation SFR “SKIF”. Owing to the vacuum chambers have small molecular conductivity and it exists the space limitation for pumps 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...
Synchrotron 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 absorption and emission spectroscopy techniques such as XAS, XANES, XES. Some sophisticated techniques like, for example, quick X-ray Absorption Fine structure (qXAFS) spectroscopy...
The technique for establishing the optical characteristics of metal-lic systems from synchrotron reflection spectra allows one to establish characteristics for the required range of low energy values. It is pro-posed to use the procedure for evaluating the electronic properties of aluminum by experimentally investigating the spectrum of optical conductivity with subsequent calculation of the...
One 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 compensation in a storage ring done by the opposite-charge beam circulating in another storage ring was proposed and tested many years ago. Ya....
Requirement for deep molecular rarefaction inside low aperture beam pipe in presence of high intensity Synchrotron Radiation together with very tight magneto-optical 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...
The using of indirect cooling cryogenic system based on cryocoolers for superconducting insertion devices (wigglers and undulators) gives opportunity, in contrast to magnets 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 magnitude of the magnetic field. To increase the cooling efficiency of such...
The “Electronic structure” beamline is dedicated for realization different photoelectron spectroscopy application in the SKIF project, requires intense photon flux in the soft X-ray and VUV ranges (10 - 2000 eV). The 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...
The article provides estimates and measurements of the dose rate of photon and neutron radiation in the accelerator hall for three modes of operation of the Novosibirsk powerful FEL, when the maximum kinetic energy of the electrons reaches 12, 20 and 40 MeV. During the operation of the micron-recuperator, photoneutrons are generated and structural elements are activated. Measurements and...
Smith-Purcell radiation is emitted by an electron moving near a periodically inhomogeneous target. The main features of Smith-Purcell radiation is monochromaticity and relation between the wavelength of radiation and the observation angle. As during generation there is no direct scattering the electrons on the atoms of material, this type of radiation can serve as a tool for non-invasive beam...
Inverse Compton scattering dubbed “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...
Several last superconducting wigglers fabricated in Budker INP are of indirect cooling. They all have small aperture with cryogenic temperature. This feature makes measurements enough complicated task. Magnetic measurement system designed especially for one of such wigglers are described in this article. The results of magnetic measurements both by Hall probe and by stretched wire method are...
The article provides 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 electrons reaches 12, 20, and 40 MeV. In the range of these energies lies a giant dipole resonance. For control, copper and stainless steel samples were irradiated....
Measuring plant 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 tested sample, by current leads located in the upper cover of cryostat, are performed by power supplies of Danfysik - system 8800 company with the help of PC and control...
X-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 state depends on the kind of a magnetic structure used, and is fixed along the entire pulse. However, it would be beneficial to control the dependence of the polarization shape on...
Monitoring system of Novosibirsk FEL optical channel state using 1-Wire devices is described
Herewith, we present the optical design of the «Structural Diagnostics» beamline developed for a fourth generation synchrotron radiation (SR) source SRF “SKIF”. The multi section beamline is based on a superconducting undulator (see table 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...
In this paper, a pulsed wire method (PWM) for magnetic measurements was described. Experimental setup was developed and assembled. The results of measurements on superconductive 38-pole 0.75 T undulator are given. Two different wires were used – 200µm and 140 µm diameter. For 140µm the calibration curve was obtained, wire position sensor has high sensitivity – 0.28 V/µm. A dispersion...
A 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 results and...
Circularly polarized photons are widely used for conducting experiments to study the magnetic structures of matter. On the basis of superconducting coils developed at the Budker Institute of nuclear physics for a short-period superconducting planar undulator, a superconducting elliptical undulator with a period of ~2.2 cm and an elliptic coefficient of ~ 0.7 is proposed. The poles of the upper...
Based 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 superconducting undulator with variable polarization (SCUVP)with a period of ~32 mm is proposed. The undulator consists of two superconducting undulators placed mutually perpendicular and powered by currents independently. Depending on the different...
Novel fourth generation and updated synchrotron radiation sources require highest quality X-ray optics resilient to extreme thermal and radiation 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 used as condensers, micro-radian...
Novosibirsk Free Electron Laser (NovoFEL) is based on rather complicated accelerator system. Complex uses three separate FELs installed on various Energy Recovery Linacs (ERLs). ERLs operate with high average beam current (about 5 mA). The severe restrictions on the electron bunch parameters for the lasing require the beam diagnostic system. The transverse beam profile measurement system uses...
Aluminum alloys with copper as a structural material are widely used in various fields of industry. 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...
The new variable period undulator with unique design was developed and built recently at Budker INP. It will replace the electromagnetic undulator being used now at the second FEL of the Novosibirsk FEL facility. As the result the FEL tunability range will be substantially increased. In this paper we present the results of the undulator magnetic field measurements for different periods as well...
Most of contemporary storage rings operates in multibunch mode. In this case the transverse dynamics in the presence of feedback may be complicated. Indeed, in general case, the amplified signal of a beam position monitor kicks all circulating bunches. In this paper the stability of such system with many degrees of freedom is considered. Damping times are estimated for the simplest...
Examples of Usage of Epics Channel Access protocol and High level Applications in Novosibirsk FEL control system are described
The distribution of some chemical elements along human hairs is proved to be an valuable indicator in a range of various cases. It may serve in order to use in medicine, toxicology, criminalistics, forensic, archaeologics, and so on [1]. However at the present any systematical studies focusing to analysing these distribution with submillimetrical and tens micron spacial resolution do not...
Composite materials based on hydroxyapatite (HAP) are of much interest for biology and medicine owing to their bioactivity. The advanced strength properties of HAP can be achieved by its reinforcement with dispersed titanium and titanium oxide particles. This makes it possible to combine biocompatibility with high mechanical strength and fracture toughness.
The structure of initial TiOy...
A discretized inverse problem of deconvolution with single- or multi-dimensional Gaussian function as the apparatus function [1] is found in a number of optical and spectroscopic applications. Because of its instability [1, p. 12; 2, p. 32-37], it is necessary to reduce it to some regularized analogue [1; 2, p. 47], after which it can be ...
To implement a soft stress state scheme used to obtain high quasi-hydrostatic pressure and large plastic deformations, Bridgman type static anvils and anvils with mutual axial rotation - shear under pressure - are 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 transitions under pressure and also...
The 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 use of effective refractive optics already at the radiation output (front-end) is necessary to realize all the possibilities and fully reveal the potential of new diffraction-limited sources.
X-ray refractive...
Synchrotron radiation is the unique electromagnetic radiation, allowing the detailed study of the internal structure of materials using various non-destructive methods. As is known, such radiation is characterized by exceptional brightness and coherence, due to the choice of a specific wavelength or energy, synchrotron light is used in many diffraction methods [1].
Existing technology in...
We demonstrate the capabilities of ion-beam lithography (IBL) for the manufacturing of the X-ray refractive micro-optics. With the help of IBL, the hardest of current materials – diamond – was milled, and micro scale diamond lenses were produced. Lenses have a rotationally parabolic profile with radii of parabola apexes less than 5 μm. As has been confirmed with SEM and AFM, shape profile...
The lithographic profile on the material surface is usually based on making structural changes in the intermediate - technological layer using radiation, and the subsequent transfer of the resulting topology to the underlying layer of the functional material. However, not all materials enable the removal process that meets the sufficient selectivity value. This report presents the results of...
A new synchrotron radiation technological station at beamline #1 from the VEPP-4M storage ring was constructed and experimental work started. The station is intend for practical training of students to carryout experiments on synchrotron radiation. The modular concept of construction of station allows us to put station in to operation in stages, also it allows us to realize various research...
Layers of multi-component SU-8 resist, which includes a diglycidyl ether of bisphenol A novolac as a monomer, were investigated by the FT-IR spectroscopic method for a wave number range of 600 - 5000 cm-1 after each step of the photo and X-ray lithography processes (coating, pre-exposure baking, exposure, post-exposure baking, development). The doses of absorbed both photo and X-ray...
When studying samples without destruction by x-ray fluorescence analysis, the thickness of the investigated 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 kiloelectronvolts, which can generate x-ray fluorescent light from a depth of...
The "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 collimated PGM scheme based on a modified SX-700 monochromator is used. During monochromatization and transportation from the frontend to the sample, the SR beam passes through five reflective elements, including a plane deflecting mirror...
Microdevices are usually made up of several interacting components that can be assembled on the basis of 3-dimensional LIGA structures, using various techniques to fulfill the required positioning accuracy - the so-called combined LIGA technology [1]. As a part of the LIGA technology, deep X-ray lithography enables the formation of 3-D microstructures of significant size in each of the three...
New silicon microstrip detector for ultra-fast dynamic studies is being developed in the Institute of Nuclear Physics SB RAS. The first prototype of such detector with a silicon sensor 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 line 8 of the VEPP-4M storage ring. The new prototype demonstrated...
XAFS spectra were measured near the K edges of the absorption 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 the course of obtaining spectra are discussed. It...
The project of the beamline “Diagnostics in the high-energy X-ray range” will become the basis for 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 introscopy, diffraction, and X-ray scattering.
A new Transmission Hard X-ray Interferometer-Microscope (THXIM), which is based on X-ray refractive lenses and diffractive gratings, was developed for 15-35 keV photon energies to 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 hutch is 17 m. The THXIM block sequence on the SR beam course within the...
The development of polymer nanocomposites has been an area of advanced scientific and industrial interests in the last ten years in connection with advances in improving the properties of materials based on a combination of a polymer matrix and, as a rule, inorganic nanomaterial. As a result, new materials are formed with improved properties such as mechanical resistance, strength and...
Compound refractive lenses (CRLs) have been widely used for more than 20 years on leading synchrotrons and free-electron lasers for hard X-ray beam transport, collimation and focusing [1-2]. The combination of coherent compatible optics and new coherent sources increased opportunities for the development of new research methods.
In this abstract, we demonstrate a new X-ray interferometer...
А.Н. Генцелев1, Ф.Н. Дульцев2,3
1 Институт ядерной физики им. Будкера Сибирского отделения Российской академии наук, 630090, Новосибирск, просп. Академика Лаврентьева, 11
2 Новосибирский государственный университет, 630090, Новосибирск, ул. Пирогова, 2
3 Институт физики полупроводников им. А.В. Ржанова Сибирского отделения Российской академии наук (ИФП СО РАН), 630090, Новосибирск,...
The “Microfocus” beamline of SKIF storage ring is a multi-branch undulator beamline to be commissioned in 2024. The “in situ diffraction at extreme conditions” end-station is designed for X-ray 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...
In the terahertz plasmonics, it is widely used wavelength 1D grooved metal gratings for excitation of surface plasmon polaritons (SPPs). SPPs are traveling charge density waves at the surface of conducting materials. Since these modes have a non-radiative nature, it is possible to excite them only if the configuration providing the wavevector-matching condition between the incident light and...
The short, narrow-band THz pulses produced by the Novosibirsk free electron laser (NovoFEL) in combination with a pump-probe experimental setup are a powerful tool to reveal information on the dynamics of resonant processes. In this work, we present our experimental setup and show some recent results on the relaxation of electronic impurity states in germanium at low temperatures.
This contribution describes the current state of the X-band EPR setup at the Novosibirsk Free Electron Laser facility (NovoFEL). Recent advances in experimental hardware and software are discussed in detail. Improvements include implementations of fast detectors for recording the THz macropulses during experiment, possibility of simultaneous use of two oscilloscopes, configured at different...
The propagation length of surface plasmon polaritons (SPPs) increases with increasing wavelength, which makes it possible to use radiation from the far-infrared 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 conductors using a...
This 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 physics, chemical and biological reactions. Uniform magnetic field of 6 T value in the research area...
THz sensing is very important tool in biological and medical applications. In this paper, we study the possibility of creating a sensor on a subwave grating in the attenuated total reflection (Otto) configuration. Using theoretical analysis and numerical simulations, the optimal parameters of the gold grating with liquid water solutions under test were found. The sensitivity of the grating...
А.Н. Генцелев1, С. А. Кузнецов1,2,3, Ф.Н. Дульцев3,4
1 Институт ядерной физики им. Будкера Сибирского отделения Российской академии наук, 630090, Новосибирск, просп. Академика Лаврентьева, 11
2 проектно-технологический институт прикладной микроэлектроники, 630090, Новосибирск, просп. Академика Лаврентьева, 2/1
3 Новосибирский государственный университет, 630090, Новосибирск, ул. Пирогова,...
Samples for analysis (optical thin section) were prepared for 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 varvechronology (layer counting) with isotopic dating (Cs-137, Pb-210, C-14). The thickness of the annual layers ranged from <1...
Two cores (67 and 105 cm) of high mountain Lake Khindiktykol (Tuva) bottom sediments were sampling by a hummer gravity corer from depths 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 synchrotron radiation (µXRF-SR). The analysis was carried out at the experimental station "Elemental analysis" in the...
The aim of the research was to identify trends and changes of moisture supply, global and local climate regime of the Central ecological zone of the Baikal natural territory (the Selenga River). For this, wet sediment core samples were analyzed by scanning X-ray fluorescence spectrometry (SRXFA scanning) in the context of paleoclimate studies. The new SRXFA station on the VEPP-4M storage ring...
The chemical composition of the bottom sediments of Bering Sea (north-west of the Pacific) was measured by method of X-ray fluorescence analysis using synchrotron radiation (SRXRF) at the collective station, VEPP 3 (Institute of Nuclear Physics, SB RAS). Column length is 560 cm. The study of the chemical composition of this column is a continuation of large-scale work aimed at studying the...
Unique 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 lymph nodes to different regions is defining in formation of a certain microelemental profile and features of the microanatomic organization of lymph nodes. Lymph nodes have...
Micro-XRF is a promising method to study elemental composition of samples and objects of various nature with spatial resolution of tens of microns to tens of nanometers [1]. Application of polycapillary optics for focusing and (optionally) collecting enables conduction of studies on synchrotron radiation (SR) sources of the second and higher ...
Mondmilch, or moon milk, is a special type of speleothems (secondary mineral formations formed 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...
A study has been first made of the element composition of both the 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 station of element analysis of SCSTR of the Institute of Nuclear Physics SB RAS (VEPP-3 store ring).
The...
The X-ray fluorescence (XRF) analysis with using synchrotron radiation (SR) is a powerful technique for resolving elemental composition of the different samples with high sensitivity and good special resolution.
For precise quantitative analysis, the procedure for robust and reliable processing of the XRF spectra is necessary. Especially, such code is very important for realization scanning...
The spread function of a x-ray polycapillary lens may be approximated very accurately by a laterally symmetrical gaussian function [1]. However it is true statement for the spacial 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...
Snow cover is an ideal deposition medium in which aerosol particles of both natural and technogenic origin are fixed and accumulated during the winter period. As a rule, environmental studies analyze the total amount of aerosol accumulated. This paper presents a study of the aerosol accumulation dynamics in the vertical section of snow cover with high spatial (temporal) resolution.
Sampling...
Nowadays, the continuous evolution of synchrotron radiation sources has resulted in a dramatic increase of brilliance and degree of spatial coherence with respect to older designs. The availability of such intense coherent X-ray beams has triggered the development of wave splitting interferometers similar to the classical double-slit Young’s experiment [1-4]. The bilens interferometer...
This work shows the results of the study of trial test samples of technological and natural origin, and using a complex composition for the development of combined methods based on synchrotron radiation (SR), such as μ-XANES/EXAFS, μ-XRF, and others. Main goal of the study is to adapt the developed integrated approach for the study of micro-inclusions and microparticles by SR methods in the...
The presented work shows the new results of a study of microparticles of the Sikhote-Alin meteorite using XANES and EXAFS methods. XANES / EXAFS spectra (Ni-K, Fe-K, W-L2), using μ- and standard methods, for meteorite microparticles and reference comparison samples were obtained both on experimental module X-ray Confocal Microscopy situated on NRC “Kurchatov Institute” (Moscow) and at XRF-,...
Investigation of intermetallic compounds have been increasingly attractive due to their structural and magnetic properties and the possibility of developing new functional materials based on them. The compounds RT2Mn (R = Dy, Er; T = Ni, Co) crystallize in cubic MgCu2 – type structure by alloying 3d transition metal (T) and rare-earth (R). Certain amount of manganese is introduced in compounds...
The aim of this work is an experimental study of the electronic interaction in the BiTeCl compound and its effect on the formation of the electronic 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 the characteristics of excited...
This report shows the results of XAFS (XANES/EXAFS) research on the state and local structure of metals in the active component of model low-percentage metal-carbon nanocomposite catalysts containing nanoscale forms of Pt, Pd, Ru. It is a well-known fact that low-percentage catalytic nanosystems containing platinoids deposited on various carbon carriers are of great interest to researchers...
We present the design of a high-resolution plane-VLS-grating soft X-ray and VUV monochromator of synchrotron 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 mirror is set in a highly asymmetric scheme and focuses radiation at a distance of about 1350 mm. The VLS-grating is set close to the mirror and...
This work presents the results of a study of the local structure of the active component of mono-, bi-metallic low-percentage (~1%) catalysts (containing Pt, Au, Pd, Ru) stabilized on oxide carriers using XAFS method (XANES/EXAFS). Studying the nature of nano-forms of noble metal stabilization is promising for creating effective catalysts for various applications, including catalytic systems...
1Kriventsov V.V., 1Volodin A.M., 1Novgorodov B.N., 1Zyuzin D.A., 1Aksenov D.G., 1Ivanov D.P., 2Iost K.N., 2Shlyapin D.A., 3Nikolaev S. A., 4Chistyakov A. V., 4Tsodikov M.V.
1Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, Novosibirsk, 630090, Russia
2Center of New Chemical Technologies BIC, Neftezavodskaya St., 54, Omsk, 644040, Russia
3Faculty of Chemistry, Moscow State...
This 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 EXAFS spectroscopy.
The deposited platinum catalysts are inevitable in various industrial oxidation and reduction processes due to their unique properties,. The variety of catalytic properties is determined by the...
Calixarenes (CA) and thiacalixarenes (TCA) are macrocyclic compounds. Calixarenes (CA) and thiacalixarenes (TCA) structure include the upper and lower rims. These molecules can be in cone conformation, partial 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 and / or lower rims by different functional...
1Kriventsov V.V., 1Volodin A.M., 1Novgorodov B.N., 1Zyuzin D.A., 1Aksenov D.G., 1Ivanov D.P., 2Nikolaev S. A., 3Chistyakov A.V.
1Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, Novosibirsk, 630090, Russia
2Faculty of Chemistry, Moscow State University, GSP-1, 1-3 Leninskiye Gory, Moscow 1, 119991, Russia
3Topchiev Institute of Petrochemical Synthesis RAS, Leninsky Pr., 29,...
Today catalytic reaction of the selective hydrogenation of furfural is perspective way to create of motor fuel components and products with high added value. Unfortunately existing catalysts providing high conversion of the initial furfural have not sufficiently high selectivity for the target products (70-80%), which indicates the need to develop new significantly more active and selective...
Today the mixed oxides with a fluorite structure of the composition (Zr, Y) O2-x are widely used to harden ferritic steels used as fuel element cladding materials for the new generation of fast neutron reactors operating under irradiation and high temperatures. This work is devoted to study of the state and local structure of samples of zirconium oxides modified by yttrium and magnesium,...
The work is devoted to the problem of the occurrence of large thermal loads on x-ray optics when it is irradiated with a 69 kW synchrotron radiation beam from a superconducting wiggler installed on a SKIF synchrotron radiation source. The task was to reduce the temperature gradient on the surface of the mirror, which lead to mechanical thermal stresses and, consequently, to geometric...
Unique installations were made - an experimental synchrotron radiation station at the VEPP-3 / VEPP-4 accelerator complex: “Explosion”, “Investigation of the extreme state of matter”. According to the characteristics of the experiments, the station “Investigation of the extreme state of matter” has no analogues in the world. The new stations made it possible to obtain unique data on measuring...
Fusion plasma confinement at facilities based on a tokamak geometry of the magnetic field includes periodical transient heat loads to divertor plates. The divertor plates of ITER are seem to be covered by polycrystalline tungsten. The tungsten tends to crack in case of the pulsed heating. The reasons of the crack formation are deformations and mechanical stresses caused by the sharp rise in...
First 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 presented. The prototype includes the silicon microstrip sensor with 1024 30 mm long strips with 50 um pitch, half of which are connected to the inputs of analogue pipeline ASICs APC128. The readout electronics can...
A unique installation, the only one in the world, was commissioned - an experimental synchrotron radiation station at the VEPP-4 accelerator complex: “Investigation of the extreme state of matter” [1]. According to the characteristics of the conducted experiments, the station has no analogues in the world. The new station made it possible to obtain unique in situ data on the dynamics of the...
The aim of the work is to develop a method that allows X-ray phase analysis using a wide synchrotron radiation (SR) spectral band (polychromatic radiation). This will make it possible to increase the number of photons in the primary beam by 2-3 orders of magnitude and, accordingly, reduce the time for determining the composition of the sample to nanoseconds.
The relationship between the...
The 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 station, there is a problem of insufficient radiation intensity, which worsens the statistics in fast processes experiments with an exposure time of diffraction patterns of 100 ps [2, 3, 4, 5, 6]. This problem can be solved through...
The 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 synchrotron radiation sources, which is realized by reducing the emittance of undulator sections, requires advanced studies of the thermal stability of the first components of the optical...
In a thermonuclear reactor plasma interacts with the divertor walls in the form of periodic heat pulses as well as constant heat load. As a result, residual plastic deformations 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...
Today, the combination of new generation X-ray sources with modern optical elements gives a strong impetus to the development of new research 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 quality of the samples.
Refractive...
The aim of this work is to study the effects of electron beam irradiation on thermal properties and particle size distribution of magnesium hydroxide. The sample was irradiated by the high-energy electron beam at the different irradiation doses in air at room temperature. The high-energy electron beam was generated by electron accelerator model ILU-6 which is located in BINP SB RAS,...
