The Siberian Siberian Synchrotron and Terahertz Radiation Center is the oldest Russian center for synchrotron radiation applications. The center combines the research efforts of numerous scientific groups, mostly from institutes of the Novosibirsk Scientific Center, as well as groups from institutes and universities of other Russian cities. The center provides research groups with access to...
The Novosibirsk FEL facility includes three FELs operating in terahertz, far- and mid- infrared spectral ranges. It has rather long history but its potential is not fully revealed so far. The first FEL of this facility has been operating for users of terahertz radiation since 2004. It still remains being the world’s most powerful sources of coherent narrow-band radiation in its wavelength...
Due to strong sextupole corrections, the vertical dynamic aperture of low-emittance storage ring is rather small. Therefore, in-vacuum small-period undulators may provide high enough field. In particular, significant electrostatic field value can be obtained near electrodes. To eliminate the field emission, the high-field surfaces has to be at positive electric potential. In this paper we...
Radiation stability and hyperfine mode structure of the terahertz NovoFEL
The electron outcoupling scheme was proposed for the high power FELs with optical cavities to avoid the power limitation due to overheating of the reflecting mirrors. This can be realized if the major part of radiation power is emitted at an angle to the optical axis. For this, the electron beam should be bunched and then slightly rotated in the undulator of the FEL.
At the NovoFEL...
Optically coupled X-Ray imaging systems exist for years, mostly dedicated to a given range of magnification that can be arbitrary split in two families with a boundary between 1X to 4X magnification
Optical coupling allows to limit the number of components located in the X-Ray beam axis, thus interesting for high flux and high energies X-Ray imaging applications
- X-Ray imaging microscopes...
Bruker AXS x-ray diffraction and scattering portfolio enables detailed analysis of any material from fundamental research to industrial quality control providing forward looking solutions to customers today. Applications of these qualitative and quantitative techniques include: phase identification, quantitative analysis, crystal structure determination, pdf analysis (total scattering), small...
Material testing mostly common carried out after irradiation the sample using classical standalone laboratory grade testing machines due to size limitations near the beamlines. However, the most valuable results could be recieved within simultaneous irradiation and mechanical stress.
50+ years of experience in development and productoin of material testing systems made possible to create...
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 “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...
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...
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...
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...
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...
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.
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...
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...
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...
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...
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...
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...
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...
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...
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 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,...
We present results of our research on generation of THz radiation in liquid nitrogen. We used a dual-frequency scheme when emissions of the main laser frequency and its second harmonic are mixed in the same medium. The research showed a possibility of effective conversion of optical radiation into THz radiation.
This work is partially supported by RFBR grant №18-29-20104.
Theoretical analysis has been carried out and test experiments have been implemented on the use of polychromatic synchrotron radiation to study fast processes in solids. The obvious benefits and challenges are outlined.
This presentation reviews some recent experiments using free-electron-laser-based narrow-band as well as tabletop-laser-based single-cycle terahertz (THz) fields for exploring electronic properties in semiconducting GaAs/InGaAs core/shell nanowires (NW) [1]. In undoped NW, charge carriers are optically excited by near-infrared pulses and probed by strong single-cycle THz fields up to 0.6...
At fast acceleration of metals, a cloud of microparticles (dust cloud) appears in front of the surface. Work on the study of these processes using Synchrotron Radiation (SR) was carried out at the Budker Institute of Nuclear Physics (Novosibirsk) [1,2].
In this work, the particle flux from shock-loaded tin was recorded using X-ray radiography, but also synchronously with another 4-channel...
In this study we performed a differential proteomic analysis of the total E.coli soluble protein fraction after exposure to THz radiation. Glutamine synthase was one of the proteins overexpressed in response to THz radiation. We constructed the E.coli/pGlnA-GFP biosensor based on the promoter of the glnA gene and the GFP protein and demonstrated that it could detect THz radiation.
This work describes the prospects of the point-like discharge supported by focused terahertz NovoFEL radiation as a source of UV and VUV light. This work is partially supported by RFBR grant офи-м № 14-22-02070.
The I12 Joint Engineering, Environmental and Processing (JEEP) beamline, was constructed during Phase II of the Diamond Light Source. The beamline started operating in November 2009. It is located on a short (5 m) straight section of the 3 GeV Diamond storage ring. The insertion device is a 4.2 T superconducting multipole wiggler. User experiments are possible with filtered white beam or...
In this work we present the current status of CW and TR EPR station at NovoFEL [1]. The detailed layout of the experimental user station is shown and discussed. While the CW and TR EPR X-band (9 GHz) spectrometer used is almost the same as in many EPR laboratories, it was built in the NovoFEL beamline and allows performing the unique EPR experiments with simultaneous irradiation of the sample...
The studies of the structure, phase composition and phase transformation of functional materials such as catalysts, sorbents, ion conductors, coatings, etc. are performed at Beamlines No.2 and No.6 of VEPP-3 and No.8 of VEPP-4M electron storage rings at Siberian Synchrotron and Terahertz Radiation Centre. The Beamline No.2 is dedicated to high resolution X-ray powder diffraction experiments;...
The report presents the results of research to assess the possibility of creating a terahertz (THz) Fourier spectrometer, the information carrier in which is surface plasmon-polaritons (SPPs) generated by a broadband radiation source. The key node of the spectrometer is the Michelson surface plasmon interferometer, which uses flat mirrors and plates for reflection and splitting SPP beams. The...
Laser welding is one of the most promising methods in comparison with other methods of welding dissimilar materials. This method does not require the use of additional materials, special edge processing, and also has a high welding speed. The aim of the work was to study the phase composition and morphology of various zones of the welded joint between alloys based on aluminum and titanium. ....
The results of pump-probe experiments devoted to investigation of relaxation of bound electrons in elemental semiconductors will be presented. The radiation of free electron lasers was used to excite the donor and measure the relaxation times. Several donors were investigated to uunderstand the common features as well as difference originated from different chemical nature of particular donor....
In the context of the global H2O cycle, an active interest is taken in water recycling associated with subduction of oceanic plates into the mantle. Mineral serpentine, Mg3Si2O5(OH)4, is regarded as the main water reservoir in oceanic litosphere [1], and therefore its dehydration can produce a large impact onto seismic activity and magma generation in subduction zones. Since the dehydration...
Abstract
Effect of external longitudinal magnetic field on the optical Free Induction Decay from a free radical is observed for the first time. The experiments were performed on a rotational transition of hydroxyl radical, OH (23/2(J=1) 23/2(J=0) at 83.8 cm−1) using Terahertz Free Electron Laser. In contrast to the results of the experiments with a stable paramagnetic molecule, NO, the...
The elaboration of catalytic materials is related to abilities to effectively probe nano-scale structures. There is significant drawback to common XRD methods addressed to well-crystallized materials, since catalyst components are often highly dispersed and present at low concentrations. The Pair Distribution Function (PDF) analysis based on operating with total scattering data is one of the...
An increase in the radiation power of THz sources creates the need for the development of new optics operating with it. Here, we propose and realize the fabrication of silicon and diamond diffractive lenses with a continuous profile by the method of direct and indirect laser ablation, respectively. The fabricated lenses were tested with a free-electron laser at the wavelength of 141 µm and...
At present different agents are developing for diagnostics and treatment of cancer - one of the main reasons of human deaths. Especially perspective examples are aptamers - single-stranded DNA or RNA molecules which are compact analogs of the antibodies with low immune response, have a short length (10-100 nucleotides), well-defined spatial structure and surface charge distribution providing...
Surface plasmon resonance (SPR) microscopy is one of the most sensitive label-free microscopy method, however, it has a low lateral resolution. This drawback is primarily caused by the fact that surface plasmon polaritons (SPPs) excited by terahertz (THz) radiation propagate from their excitation spot to macro distances (about ~100 λ), thereby blurring the observed region by analogy with a...
Ultrafine grained Au-Co alloys were prepared by high pressure torsion (HPT) technique. The severe plastic deformation was carried out at room and cryogenic temperatures. A consolidated alloy is formed from the initial powder mixture of metals in an equiatom ratio after mechanical alloying. Then, synchrotron radiation diffractometry of the obtained samples was carried out. It was found that...
One of the leading areas in telecommunication technology is the development of high-speed devices. At present, the use of the acousto-optical (AO) effect to control radiation is promising. Devices based on this effect are used in the ultraviolet, visible and infrared ranges. One of the main problems of using the AO effect in the terahertz (THz) range is the low diffraction efficiency (four...
Recent extensive research on high-temperature superconductivity in compressed binary hydrogen-rich compounds generat-ed a large corpus of phase stability calculations with an evident lack of their experimental verification. Pt-H system at high pressure represent a typical example of inconsistency between computational approach, which predicted stability of eight PtH structures, and experiments...
Alumina containing systems are of great significance for catalysis due to the unique properties of this oxide. These systems usually exist in nanoscale state. Their composition and physicochemical properties depend on the preparation conditions. The appearance of novel methods of alumina synthesis give a new stimulus to the study of their structure and properties. Therefore such substances are...
The reducibility of oxides is an essential characteristic of catalyst of different reactions. First of all, it is important for oxidation reactions following the Mars-van Krevelen mechanism. In this mechanism, a weakly bound surface oxygen atom is added to forming the oxygenated compound, leaving behind an oxygen vacancy on the surface. Then, the molecular oxygen react with the surface,...
Here we present our latest achievements regards diamond single crystal growth and characterization by means of X-ray diffraction. Synthetic diamond crystals were grown by the temperature gradient method using a high-pressure apparatus of the ‘‘split sphere’’ type (BARS) at P=5.7 GPa and T=1550 °C with the use of a Ni0.7Fe0.3 alloy as a solvent-catalyst. It has been shown that dislocation-free...
In 1990s, the emergence of the 3rd generation synchrotron user facilities equipped with undulator sources, stimulated pioneering works on interaction of coherent X-ray beams with matter (Brauer et al. 1995), resulted in the development of X-ray photon correlation spectroscopy (XPCS) technique, capable to probe nanoscale fluctuations up to kHz frequencies using dynamics of speckle pattern given...
A line of polymethylmethacrylate (PMMA) samples was synthesized using synchrotron radiation of the VEPP-3 accelerator and the high-energy electron beam of the ILU-6 accelerator. The study was carried out during the in situ synthesis of PMMA in the recording of luminescence spectra and their kinetics. An experimental study was also made of the luminescence of PMMA samples with a molecular...
The design of the user station for a fourth-generation synchrotron radiation (SR) source SRF “SKIF” has been proposed. The station is designed to solve a wide range of research and technological tasks using X-ray diffraction techniques. The concept of the station is based on the implementation of a complex approach to the structural studies of synthetic and natural objects. The most complete...
“Fast Processes” is one out of six 1st priority beamlines that are planned for construction within the project SRF SKIF (Shared Research Facility “Siberian circular photon source") [1]. The beamline would include two independent instruments installed at a wiggler source, i.e., Dynamic processes and Plasma. The beamline is designed to meet a wide range of research and technological challenges...
The solid solution based on the copper chromium disulfide CuCrS2 are promising functional materials for modern electronics applications. These compounds exhibit the potential properties for practical usage: the thermoelectric properties [1], the ionic conductivity [2], the helimagnetic arrangement [3-4], the colossal magnetoresistance and the phase metal-insulator transition [4].
There are...
Selective laser melting is an additive technology that is gaining popularity due to its ability to produce complex metal components that cannot be manufactured using traditional technologies.To achieve high quality components created using SLM, it is necessary to control the processes of melting and subsequent crystallization in metals. Using the high synchrotron radiation (SR) intensity from...
In this work, we have studied the structural anisotropy of polyaniline and polypyrrole films depending on the type of conductive carbon substrates, including highly oriented pyrolytic graphite (HOPG) and vitreous carbon being a fullerene-like material in its structure. The NEXAFS spectra were measured at both carbon and nitrogen K absorption edges. To analyze the chemical structure of the...
An important task of studying the properties of modern materials is to study the surface, including determining the atomic and electronic structure of solid. A special place is occupied by 2D materials where the surface structure determines the properties of the material, such as topological insulators and other low-dimensional systems. Topological insulators, because of the special properties...
“Electronic Structure” is a state-of-the-art beamline for methods using the Soft X-Rays range (10-2000 eV) at the 3 GeV ring of SKIF synchrotron facility. At present, three branch lines is funded, which will host an end station for Near Ambient pressure X-Ray Photoelectron Spectroscopy (NAP XPS), Spin-Angle Resolved Photo-Emission Spectroscopy (Spin-ARPES) and Reflectometry and Metrology. The...
The most advanced X-ray sources, such as third-generation synchrotrons and free electron lasers (XFEL), are capable to generate high brightness coherent radiation, especially in the hard X-ray region. The availability of such beams facilitates the development of a new generation of X-ray optics, whose optical properties allow going far beyond simple collimation and focusing functions. This...
Лабораторией квантовой химии НИЦ «Курчатовский институт» - ПИЯФ (http://qchem.pnpi.spb.ru) разработан комбинированный подход на основе потенциала встраивания кластера в кристалл (который мы назвали «настраиваемым под соединение» потенциалом внедрения, НСПВ, или compound-tunable embedding potential, CTEP) [1-3] для исследования различных свойств материалов (периодических структур, структур с...
Angle-resolved photoemission spectroscopy (ARPES) has proven to be particularly successful for the investigation of the electronic structure of solids and their surfaces. A synchrotron radiation beamline in a vacuum ultraviolet (VUV) to soft x-ray photon energy range of 18-240 eV and a photon flux up to 2·10^13 ph/s have been constructed at the 3 GeV Diamond Light Source storage ring. The...
Different kinds of X-ray mirrors are required for beam alignment, guidance or monochromator applications. Therefore various types of optics with coatings for energy ranges between 100 eV and 80 keV have been investigated.
We will show stripe multilayer coatings which are often used as Double Crystal Multilayer Monochromators (DCMM) for example in tomography beamlines. The optics consists of...
During last decade materials science developing the methods of obtaining and studying of new materials for magnetic and catalytic aplications based on nanostructured thin films and nanostructures of different metals [1,2]. Nickel due to there high magnetic and cathodic properties has technological and scientific interest. It should be noted that the magnetic and catalytic properties depend on...
The visualization and analysis of 3D fields of elastic displacements of micro-dimensional defects and dislocation structures in the volume of single crystals are important in the development of new functional materials. For this purpose, the X-ray diffraction tomography (XRDT) method is increasingly being used. We use XRDT to study the real structure of different single crystals, in...
LUMINESCENT SPECTROSCOPY OF Pr${}^{3+}$ IONS IN SOME PHOSPHATES, BORATES AND SILICATES USING X-RAY SYNCHROTRON RADIATION FROM VEPP-3 STORAGE RING
Kiselev S.A.${}^{1,\ a)}$, Pustovarov V.A.${}^{1,\ b)}$ and Bettinelli M.${}^{2,\ c}$${}^{)}$
${}^{1}$Institute of Physics and Technology, Ural Federal University, 19 Mira st., Ekaterinburg, 620002, Russia
${}^{2\ }$Laboratory of Luminescent...
We have employed VEPP-4 synchrotron radiation to measure CCD detector absolute responsivity in vacuum ultraviolet (115-310 nm) spectral range. The detector is designed in the form of a stainless steel enclosure containing a backside-illuminated CCD to protect the CCD from contamination. The entrance window of the enclosure is a round MgF2 spectral filter transparent for ultraviolet radiation...
Tasks arising with the growing need for alternative renewable energy sources and environmentally pure catalytic technologies stimulate the search for new functional materials. At present, growing interest is in compounds containing chalcogenide and dichalcogenide groups, which may perform as active catalytic centers. In this regard, binuclear and trinuclear transition metal clusters modified...
This work considers the optical properties and structure of thin films of titanium dioxide formed by glancing angle deposition to improve light yield of scintillation materials. The experimentally obtained value of the refractive index was about 1.2, which is almost two times less than the refractive index of crystalline titanium dioxide. This allows you to use this method to modify the...
Fluorinated graphite (FG) attracts the attention of researchers due to a wide range of physicochemical properties, which is promising for its use as an element base of microelectronic devices (LED elements, gas sensors, etc.), and also as a cathode for lithium-ion batteries. More importantly, recent studies have shown that intercalated systems based on graphite and its derivatives can be used...
In the last decade, Hybrid Photon Counting (HPC) X-ray detectors [1] have transformed synchrotron research. They provide noise-free detection and make new data acquisition modes possible. The new HPC detector family EIGER2 enables even more ambitious X-ray science. These detectors combine all advantages of previous generations of HPC detectors
while offering new features and improved...
A technique combining SR XRF, XRF mapping, μ-XRF, and μ-XAFS for search for microparticles in different matrices and determination of particle size, as well as analysis of their composition and structure, has been developed at Budker Institute of Nuclear Physics. The technique is based on comprehensive examination of sample with gradually increasing the spatial resolution and constricting the...
A short introduction to JJ X-Ray and the potential collaboration for beamline instrumentation with SKIF.
JJ-X Ray is a Danish company situated at DTU Science Park near Copenhagen. JJ X-ray specializes in developing, designing and producing advanced components and assemblies for x-ray, synchrotron radiation, FEL and neutron instrumentation. In particular, JJ X-Ray is scientifically involved...
В докладе будут рассмотрены основные потребности пользователей синхротронного излучения, задачей которых является рентгеноструктурный анализ монокристаллов биополимеров (белков, нуклеиновых кислот и их комплексов) и дальнейшая расшифровка структуры, необходимая для решения изначально поставленной биологической задачи. Для сбора информации автор консультировался с исследователями, регулярно...
For river ecosystems, one of the site of chemical elements accumulation is benthic assemblages. In our research 20 benthic samples were collected from small rivers and streams from industrial and nature areas of Novosibirsk region. Benthic invertebrates were fixed at 75% ethanol and identified up to the family taxonomical level at the laboratory. After identification samples were dried up to...
The main generators of radiation in fourth-generation sources are insertion devices which are installed in special straight sections of light sources. Multipole magnetic systems such as wigglers and undulators are used to produce high brightness due to a large number of magnetic poles. Multipole magnetic systems are manufactured using conventional electromagnets, permanent magnets, and...
