Characterization of windows and filters for coherent X-ray beamlines

Yoshio Suzuki, Atsushi Momose, Hiroshi Sugiyama

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)596-599
Number of pages4
JournalJournal of Synchrotron Radiation
Issue number3
Publication statusPublished - 1998 May 1
Externally publishedYes


  • Beryllium window
  • Coherence
  • Phase contrast
  • Small-angle scattering
  • X-ray beamlines

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation


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