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

作者：Park So Yeong; Hong Chung Ki; Lim Jun^*

来源：Review of Scientific Instruments, 2014, 85(4): 045116.

DOI：10.1063/1.4871099

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 mu m (horizontal) x 50 mu m (vertical).

• 出版日期2014-4