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

Journal Article · Tue Apr 15 04:00:00 EDT 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4871099· OSTI ID:22254922

Park, So Yeong; Hong, Chung Ki ^[1]; Lim, Jun ^[2]

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1. Department of Physics, POSTECH, Pohang 790-784 (Korea, Republic of)
2. Pohang Accelerator Laboratory, POSTECH, Pohang 790-784 (Korea, Republic of)

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)

• OSTI ID: 22254922
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 4 Vol. 85; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BERYLLIUM
COHERENCE LENGTH
DIFFRACTION
HARD X RADIATION
LENSES
MEASURING METHODS
OPTICS
POHANG LIGHT SOURCE
WIGGLER MAGNETS