Improved optics for multiple-wavelength anomalous diffraction crystallography at CHESS

Karl W. Smolenski; Qun Shen; Alan Pauling; Park Atkinson Doing; Ernest Fontes

doi:10.1117/12.411631

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5 January 2001 Improved optics for multiple-wavelength anomalous diffraction crystallography at CHESS

Karl W. Smolenski, Qun Shen, Alan Pauling, Park Atkinson Doing, Ernest Fontes

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Proceedings Volume 4145, Advances in X-Ray Optics; (2001) https://doi.org/10.1117/12.411631
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

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, Qun Shen, Alan Pauling, Park Atkinson Doing, and Ernest Fontes "Improved optics for multiple-wavelength anomalous diffraction crystallography at CHESS", Proc. SPIE 4145, Advances in X-Ray Optics, (5 January 2001); https://doi.org/10.1117/12.411631

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