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Title: Measurement of coherence length and incoherent source size of hard x-ray undulator beamline at Pohang Light Source-II

We measured the spatial coherence length and incoherent source size of a hard x-ray undulator beamline at Pohang Light Source-II, the stored electron energy of which has been increased from 2.5 GeV to 3 GeV. The coherence length was determined by single-slit measurement of the visibility of the Fresnel diffraction pattern. The correlated incoherent source size was cross-checked for three different optics: the single slit, beryllium parabolic compound refractive lenses, and the Fresnel zone plate. We concluded that the undulator beamline has an effective incoherent source size (FWHM) of 540 μm (horizontal) × 50 μm (vertical)
Authors:
;  [1] ;  [2]
  1. Department of Physics, POSTECH, Pohang 790-784 (Korea, Republic of)
  2. Pohang Accelerator Laboratory, POSTECH, Pohang 790-784 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22254922
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; 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:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BERYLLIUM; COHERENCE LENGTH; DIFFRACTION; HARD X RADIATION; LENSES; MEASURING METHODS; OPTICS; POHANG LIGHT SOURCE; WIGGLER MAGNETS