The Crystal Monochromator at BESSY

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Abstract
The crystal monochromator at BESSY covers the soft x-ray region above 800 eV up to about 5000 eV employing the (n,-n) double crystal arrangement with constant beam offset. Beamline and monochromator have been optimized for high flux and high resolution, and care has been taken to minimize radiation damage and temperature effects on the first crystal. The mono-chromator uses a novel mechanical linkage system for two simultaneous rotations and a translation and combines an effective homogeneous cooling of the first crystal with a simple in situ crystal exchange. Design features and performance data are presented.

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