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Sagittal focusing of high‐energy synchrotron X‐rays with asymmetric Laue crystals. II. Experimental studies

Sagittal focusing of high‐energy synchrotron X‐rays with asymmetric Laue crystals. II.... The use of bent asymmetric Laue crystals to focus synchrotron X‐rays sagittally from 15 to 50 keV is described. A four‐bar bender, bending a rectangular planar crystal, produced the necessary sagittal and meridional bending for this unique application. Adjustments of the tilt angle and height of the bent crystal resulted in first‐ and second‐order corrections, respectively, to the dependence of the angle of diffraction on the horizontal position on the crystal. After these corrections, the remaining variation of the diffraction angle was of the order of 10 µrad. The theoretical sagittal focal length was verified. A prototype of a double‐crystal sagittally focusing monochromator was constructed and tested, using two identical Laue crystals. A horizontal divergence of 3 mrad was focused to a horizontal dimension of about 0.4 mm. The X‐ray flux density at the focus was a few hundred times larger than that of unfocused X‐rays. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Crystallography Wiley

Sagittal focusing of high‐energy synchrotron X‐rays with asymmetric Laue crystals. II. Experimental studies

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References (15)

Publisher
Wiley
Copyright
Copyright © 2001 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1600-5767
eISSN
1600-5767
DOI
10.1107/S0021889801010627
Publisher site
See Article on Publisher Site

Abstract

The use of bent asymmetric Laue crystals to focus synchrotron X‐rays sagittally from 15 to 50 keV is described. A four‐bar bender, bending a rectangular planar crystal, produced the necessary sagittal and meridional bending for this unique application. Adjustments of the tilt angle and height of the bent crystal resulted in first‐ and second‐order corrections, respectively, to the dependence of the angle of diffraction on the horizontal position on the crystal. After these corrections, the remaining variation of the diffraction angle was of the order of 10 µrad. The theoretical sagittal focal length was verified. A prototype of a double‐crystal sagittally focusing monochromator was constructed and tested, using two identical Laue crystals. A horizontal divergence of 3 mrad was focused to a horizontal dimension of about 0.4 mm. The X‐ray flux density at the focus was a few hundred times larger than that of unfocused X‐rays.

Journal

Journal of Applied CrystallographyWiley

Published: Oct 1, 2001

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