5 January 2001 Improved optics for multiple-wavelength anomalous diffraction crystallography at CHESS
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Abstract
The optics at the F2 station of CHESS have been completely redesigned and rebuilt. The new design consists of a white- beam collimating mirror and a fixed-exit double-crystal monochromator, which are optimized for the growing field of multiple-wavelength anomalous diffraction (MAD) crystallography. The upstream mirror reduces the heat load onto the monochromator by two-thirds and increases the energy resolution of the x-ray beam to its source-size limit. The new single-rotation fixed-exit monochromator employs a slightly- tilted second-crystal translation that allows fast and reliable changes in the energy of the outgoing beam while maintaining its beam position. Two additional angle-segment stages, one for each crystal, are used to fine tune the second-crystal translation tilt so that the translation stage can be always positioned along the tangent of the desired loci of the second crystal for a wide energy range of 7 - 17 keV using Si (111).
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Karl W. Smolenski, Karl W. Smolenski, Qun Shen, Qun Shen, Alan Pauling, Alan Pauling, Park Atkinson Doing, Park Atkinson Doing, Ernest Fontes, Ernest Fontes, } "Improved optics for multiple-wavelength anomalous diffraction crystallography at CHESS", Proc. SPIE 4145, Advances in X-Ray Optics, (5 January 2001); doi: 10.1117/12.411631; https://doi.org/10.1117/12.411631
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