Characterization of windows and filters for coherent X-ray beamlines

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作者：
Suzuki, Yoshio
Momose, Atsushi
Sugiyama, Hiroshi
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Journal of Synchrotron Radiation | 1998年 / 5卷 / 03期
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摘要：
Beryllium windows and graphite heat absorbers used in coherent X-ray beamlines must be optically flat. If the optical path through the window varies by more than λ/4, the X-ray wave front will be distorted after passing through the window, and the divergence of the X-ray beam may be increased. This reduces the beam coherence. Beryllium, graphite and Kapton films have been tested using ultra-small-angle X-ray scattering. Wave-front distortion was also directly observed by means of phase-contrast X-ray microradiography. The measured increase of angular divergence is about 4 μrad. The wave-front distortion is larger than 2π (optical path difference of λ). These are serious problems for utilizing coherent X-ray beams.
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页码：596 / 599
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