Measurement of coherence length and incoherent source size of hard x-ray undulator beamline at Pohang Light Source-II
Journal Article
·
· Review of Scientific Instruments
- Department of Physics, POSTECH, Pohang 790-784 (Korea, Republic of)
- 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, Vol. 85, Issue 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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