Yu.N. Shilin

The belok station for protein crystallography on the synchrotron radiation beam from the bending magnet in the Sibir-2 storage ring

Design modifications made in the initial project of the Belok station in the Sibir-2 storage ring and the alignment and calibration methods are considered. The main operating parameters of the station are reported. Protein single crystals in a capillary at T = 293 K and without a capillary at T = 95 K, powders (angular resolution Δ2ϑ = 0.04°), and nanocrystalline Na and Cl2 precipitates (sizes, shape, and orientation) in electron-irradiated NaCl crystals have been investigated. The problem of focusing of a short-wavelength synchrotron radiation beam with sagittal bending of the second crystal in the double-crystal monochromator at a limited source-to-sample distance is solved in the Belok project.

A station for synchrotron X-ray topography

Abstract The scheme of a station with three parallel horizontal axes for X-ray synchrotron topography is suggested. The possibility of shifting the axis of the first monochromator along the direction of the SR beam, while the second and the third axes are stationary in the horizontal plane outside the primary beam, allows one to carry out different precise methods for dispersion and nondispersion diffraction geometries.

Modular goniometer set for high-resolution X-ray diffraction experiments using synchrotron radiation

Abstract A set of goniometer modules is described that allows easy assembling of the necessary optical layouts for experiments using synchrotron radiation. The technical parameters of the goniometers are given, and examples of setups assembled from the set elements are presented. Software drivers for the goniometers are described. Experimental results obtained with the use of an instrument based on the set are reported.

Instrumentation for high‐precision x‐ray optics at the synchrotron radiation source ‘‘Zelenograd’’

The high‐precision x‐ray optics station is to be installed on one of the five branches of the wiggler beamline at the new dedicated synchrotron radiation source ‘‘Zelenograd.’’ It is intended for the precision x‐ray diffraction measurements using different methods which have been developed in the last decade for the structure studies of nearly perfect crystals and interfaces. The station consists of the double‐crystal monochromator unit, the main goniometer with the crystal analyzer, the slit system with ion chambers, and the control and data acquisition system. The design of principal units and modules of the station is treated. The x‐ray optics schemes which can be implemented on the station are described. The control and measuring system for x‐ray experiments is presented.

Station for X-ray structural analysis of materials and single crystals (including nanocrystals) on a synchrotron radiation beam from the wiggler at the Siberia-2 storage ring

The design of the station for structural analysis of polycrystalline materials and single crystals (including nanoobjects and macromolecular crystals) on a synchrotron radiation beam from the superconducting wiggler of the Siberia-2 storage ring is described. The wiggler is constructed at the Budker Institute of Nuclear Physics of the Siberian Division of the Russian Academy of Sciences. The X-ray optical scheme of the station involves a (1, −1) double-crystal monochromator with a fixed position of the monochromatic beam and a sagittal bending of the second crystal, segmented mirrors bent by piezoelectric motors, and a (2θ, ω, φ) three-circle goniometer with a fixed tilt angle. Almost all devices of the station are designed and fabricated at the Shubnikov Institute of Crystallography of the Russian Academy of Sciences. The Bruker APEX11 two-dimensional CCD detector will serve as a detector in the station.

Crystal monochromator with a large curvature of the sagittal bending

A new crystal monochromator is designed and tested. The crystal monochromator allows for the use of a large curvature of the sagittal bending and makes it possible to focus synchrotron radiation at a short wavelength and a limited distance from the synchrotron radiation source to the sample.

X-ray instrumentation for SR beamlines

Abstract The main possibilities and parameters of experimental X-ray stations are presented: “Protein crystallography”, “X-ray structure analysis”, “High-precision X-ray optics”, “X-ray crystallography and material science”, “X-ray topography”, “Photoelectron X-ray standing wave” that are being installed at Kurchatov SR source by A.V. Shubnikov Institute of Crystallography.

The multicrystal modular spectrometer for x‐ray diffraction studies using SR

We suggest a set of elements united in the modular x‐ray spectrometer to easily implement multiaxis, multipurpose x‐ray diffraction schemes, multiple‐diffraction layouts with two‐dimensional collimation of the incident beam, surface diffraction schemes, and experiments with various modifications of the x‐ray standing wave method. The main elements of the spectrometer are: the one‐circle goniometer with the vertical axis, the multicircle research goniometer, and different slit systems. All units except the multicircle goniometer can be mounted on two parallel optical guides. The multicircle goniometer is a stand‐alone unit consisting of an Eulerian cradle mounted on a two‐circle goniometer. All rotations are driven by stepping motors via worm gears. On axes where fine (to 0.1 arc sec or less) angular positioning is desirable, torsion‐element‐based rotation is used; it is driven via piezo drivers. A program package was developed to control the experiments. The software is based on the modular principle providing for fast implementation of application programs suited for specific x‐ray diffraction methods. The results of multiple‐diffraction studies with the use of the instrument are presented.

Photoelectron yield excited by an X-ray standing wave with synchrotron radiation: energy-dispersive measurements with a magnetic analyzer

Abstract A magnetic solenoidal detector suitable for synchrotron radiation was constructed and tested at an experimental station at HASYLAB. An energy calibration and energy resolution were determined by measuring spectra from various samples. X-ray standing wave measurements were made for GaAs crystal.