Spectrometer of Synchrotron Radiation Based on Diffraction Focusing a Divergent Beam Formed by a Compound Refractive Lens
- Authors: Kohn V.G.1,2, Smirnova I.A.3, Snigireva I.I.4, Snigirev A.A.5
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Affiliations:
- National Research Centre “Kurchatov Institute,”
- Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”
- Institute of Solid State Physics
- European Synchrotron Radiation Facility
- I. Kant Baltic Federal University
- Issue: Vol 63, No 4 (2018)
- Pages: 536-542
- Section: Diffraction and Scattering of Ionizing Radiations
- URL: https://journals.rcsi.science/1063-7745/article/view/192639
- DOI: https://doi.org/10.1134/S1063774518040119
- ID: 192639
Cite item
Abstract
The results of the first experimental realization of a spectrometer based on the effect of diffraction focusing of X rays by a flat single crystal are discussed. A secondary X-ray source with a relatively high angular divergence and small sizes was formed at the focus of a compound refractive lens having 50 beryllium biconcave elements with a curvature radius of 50 μm. The silicon spectrometer crystal was cut in the form of a wedge of variable thickness, oriented perpendicular to the diffraction plane. The reflection 111 was used for energies of 8.3 and 12 keV. To simulate the experiment, a computer program was developed, which takes into account accurately and for the first time the focusing of radiation by the lens and its subsequent diffraction in the crystal. A calculated curve for a monochromatic beam has made it possible to determine the monochromator spectrum with high resolution from experimental data for a polychromatic beam. It is shown that monochromator resolution increases with an increase in the distance from the compound refractive lens to the crystal.
About the authors
V. G. Kohn
National Research Centre “Kurchatov Institute,”; Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”
Email: irina@issp.ac.ru
Russian Federation, Moscow, 123182; Moscow, 119333
I. A. Smirnova
Institute of Solid State Physics
Author for correspondence.
Email: irina@issp.ac.ru
Russian Federation, Chernogolovka, Moscow oblast, 142432
I. I. Snigireva
European Synchrotron Radiation Facility
Email: irina@issp.ac.ru
France, Grenoble
A. A. Snigirev
I. Kant Baltic Federal University
Email: irina@issp.ac.ru
Russian Federation, Kaliningrad