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Proceedings Paper

Diamond: a multilayer and sagittally focusing crystal as optical elements on the ID14/Quadriga-3 beamline at ESRF
Author(s): Wilhelm P. Burmeister; Dominique Bourgeois; R. Kahn; Hassan Belrhali; E. P. Mitchell; S. M. McSweeney; S. Wakatsuki
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Paper Abstract

ID14/Quadriga at the ESRF is an undulator beamline dedicated to monochromatic macromolecular crystallography. Based on the Troika concept, this beamline has four simultaneously operating experimental stations: three side stations using thin diamond crystals, and an end station with a fast-scan double-crystal monochromator and a toroidal mirror. Two undulators with 23 mm and 42 mm periods and a minimum gap of 16 mm on a high-beta section provide a high brilliance X-ray beam between 6.2 keV and 35 keV. The principle of a multiple station beamline on an undulator X-ray source has been developed by Als-Nielsen. We use the (111) reflection of an (100) oriented diamond in asymmetric Laue mode or a (111) oriented diamond in Bragg mode in order to select a wavelength for the side station. Compared to the Troika beamline at ESRF, the optical system is more complex comprising a sagitally (vertically) focusing Ge(220) crystal and a multilayer on a bimorph bender for horizontal focusing. Independent focusing in the horizontal and vertical planes allows the use of both a Bragg-Bragg setup of the monochromator and a Laue-Bragg setup where difficulties arise from energy dispersion and focusing effects of the Laue crystal. The properties of a thin diamond crystal in asymmetric Laue mode are discussed. The optical system provides a high brilliance monochromatic X-ray beam with focal spotsize down to 0.2*0.06 mm2 FWHM and a flux of about 1*1011 photons/s at 13.2 keV. The opticl system of the first side branch, Quadriga-3, is operating since summer 1997.

Paper Details

Date Published: 11 December 1998
PDF: 9 pages
Proc. SPIE 3448, Crystal and Multilayer Optics, (11 December 1998); doi: 10.1117/12.332506
Show Author Affiliations
Wilhelm P. Burmeister, European Synchrotron Radiation Facility (France)
Dominique Bourgeois, Institut de Biologie Structurale (France)
R. Kahn, Institut de Biologie Structurale (France)
Hassan Belrhali, European Synchrotron Radiation Facility (France)
E. P. Mitchell, European Synchrotron Radiation Facility (France)
S. M. McSweeney, European Molecular Biology Lab. (France)
S. Wakatsuki, European Synchrotron Radiation Facility (France)

Published in SPIE Proceedings Vol. 3448:
Crystal and Multilayer Optics
Albert T. Macrander; Andreas K. Freund; Tetsuya Ishikawa; Dennis M. Mills, Editor(s)

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