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Title: Circular grating interferometer for mapping transverse coherence area of X-ray beams

A circular grating interferometer was used to map the transverse coherence area of an X-ray beam. Due to the radial symmetry of the circular grating, coherence lengths along all transverse directions were obtained simultaneously by measuring the visibility decay of interferograms recorded at different distances behind a single circular π/2 phase grating. The technique is model-free and provides direct measurement of the complex coherence factor of the beam. The use of a circular grating also enables the unique capability of measuring the source shape profile. Sensitivity of this technique was demonstrated by detecting the small source tilt of a few degrees.
Authors:
; ; ; ; ;  [1]
  1. Advanced Photon Source, Argonne National Laboratory, 9700 S Cass Ave, Lemont, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
22311186
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BEAMS; COHERENCE LENGTH; DECAY; INTERFEROMETERS; SENSITIVITY; SYMMETRY; VISIBILITY; X RADIATION