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Updated: Jun 14, 2025

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
Published on: October 11, 2016
Precise measurement of spatial coherence and axial brightness based on the Wigner function reconstruction in
Shuhei Hatanaka1,2, Jun Yamasaki1,3
1Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, 7-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
Abstract:
The spatial coherence and the axial brightness of a cold field emission gun, a Schottky field emission gun and a lanthanum hexaboride thermionic gun are precisely measured. By analyzing the Airy pattern from a selected area aperture, various parameters including the spatial coherence length are determined. Using the determined coherence length, the axial brightness of the field emission guns is estimated using the equation which we previously derived based on the discussion of the Wigner function of an electron beam. We also make some extensions in the method to be applicable to the measurements of the thermionic gun, which has anisotropic intensity distribution in most cases unlike the field emission guns. Not only conventional average brightness but also the axial brightness measured for the three kinds of emitters are compared accurately and precisely without being influenced by the measurement conditions.
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