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Proceedings Paper

Diffractive-refractive optics for focusing hard x-ray beams
Author(s): Jaromir Hrdy; Nikolai Artemiev; Andreas K. Freund; John P. Quintana
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Paper Abstract

The sagittal focusing of x-ray beam diffracted on symmetrically cut crystals with a longitudinal parabolic groove on their diffraction surfaces has been proved experimentally and the results have been already published. This kind of focusing is based on the refraction phenomena occurring during Bragg x-ray diffraction. In this paper our new developments in this field are reported. First, it was shown experimentally that in some cases a channel-cut crystal monochromator with longitudinal parabolic grooves can be replaced by a single crystal with a round hole drilled parallel to diffracting planes. This substantially simplifies the manufacturing of such a focusing monochromator. Second, it has been experimentally proved that the refraction effect, on which the focusing is based, may be substantially enhanced by cutting the longitudinal parabolic groove into the surface of an asymmetrically cut crystal (or drilling a hole whose axis is tilted with respect to the diffracting planes). A very simple formula describing the focusing properties for this case is derived. Finally, the results of the first experiment on the meridional focusing of x-ray beam diffracted on a crystal with a transversal groove on its surface are reported. Some experimental results are compared with the results of ray- tracing simulations, which were developed for this purpose.

Paper Details

Date Published: 14 November 2001
PDF: 11 pages
Proc. SPIE 4501, X-Ray Mirrors, Crystals, and Multilayers, (14 November 2001); doi: 10.1117/12.448481
Show Author Affiliations
Jaromir Hrdy, Institute of Physics (Czech Republic)
Nikolai Artemiev, Institute of Physics (Czech Republic)
Andreas K. Freund, European Synchrotron Radiation Facility (France)
John P. Quintana, Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 4501:
X-Ray Mirrors, Crystals, and Multilayers
Andreas K. Freund; Tetsuya Ishikawa; Ali M. Khounsary, Editor(s)

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