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Research on spatial coherence of undulator source in Shanghai synchrotron radiation facility

Wang Hua Yan Shuai Yan Fen Jiang Sheng Mao Cheng-Wen Liang Dong-Xu Yang Ke Li Ai-Guo Yu Xiao-Han

Research on spatial coherence of undulator source in Shanghai synchrotron radiation facility

Wang Hua, Yan Shuai, Yan Fen, Jiang Sheng, Mao Cheng-Wen, Liang Dong-Xu, Yang Ke, Li Ai-Guo, Yu Xiao-Han
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  • Received Date:  14 July 2011
  • Accepted Date:  13 December 2011
  • Published Online:  20 July 2012

Research on spatial coherence of undulator source in Shanghai synchrotron radiation facility

  • 1. Shanghai Institute of Applied Physics, Shanghai Synchrotron Radiation Facility, Chinese Academy of Sciences, Shanghai 201204, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No. 11075200) and the National Basic Research Program of China (Grant No. 2010CB934501).

Abstract: Firstly, based on the Gaussian-schell model source theory and the propagation of cross-spectral density function in free space, the spatial coherence of undulator source (BL15U) in Shanghai Synchrotron Radiation Facility is studied. Secondly, the influences of pre-focusing mirror and the monochromator on the beam spatial coherence are discussed. Finally, the spatial coherent length at mono slit S2 is measured. The spatial coherent length at S2 theoretically is 66.5 μm, but experimentally is 27 μm. This difference is due to the high frequency vibration of pre-focusing mirror or monochromato. Nevertheless, high coherent hard X ray beams can be obtained at the location of experimental sample and many coherent experiments can be fulfilled on this beamline.

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