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11 December 1998 Diamond: a multilayer and sagittally focusing crystal as optical elements on the ID14/Quadriga-3 beamline at ESRF
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wilhelm P. Burmeister, Dominique Bourgeois, R. Kahn, Hassan Belrhali, E. P. Mitchell, S. M. McSweeney, and S. Wakatsuki "Diamond: a multilayer and sagittally focusing crystal as optical elements on the ID14/Quadriga-3 beamline at ESRF", Proc. SPIE 3448, Crystal and Multilayer Optics, (11 December 1998); https://doi.org/10.1117/12.332506
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