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The wavefront preservation of coherent X‐ray free‐electron laser beams is pushing the requirement on the quality and performance of X‐ray optics to an unprecedented level. The Strehl ratio can be used to quantify this requirement. In this paper, the criteria for thermal deformation of the X‐ray optics are formulated, especially for crystal monochromators. To preserve the X‐ray wavefront, the standard...
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