Numerical modeling of thermal loading of diamond crystal in X-ray FEL oscillators

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Mei-Qi Song, Qing-Min Zhang, Yu-Hang Guo, Kai Li and Hai-Xiao Deng. Numerical modeling of thermal loading of diamond crystal in X-ray FEL oscillators[J]. Chinese Physics C, 2016, 40(4): 048101. doi: 10.1088/1674-1137/40/4/048101
Mei-Qi Song, Qing-Min Zhang, Yu-Hang Guo, Kai Li and Hai-Xiao Deng. Numerical modeling of thermal loading of diamond crystal in X-ray FEL oscillators[J]. Chinese Physics C, 2016, 40(4): 048101.  doi: 10.1088/1674-1137/40/4/048101 shu
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Received: 2015-10-15
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    Supported by National Natural Science Foundation of China(11175240, 11205234, 11322550) and Program for Changjiang Scholars and Innovative Research Team in University(IRT1280)

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Numerical modeling of thermal loading of diamond crystal in X-ray FEL oscillators

    Corresponding author: Qing-Min Zhang,
  • 1.  Department of Nuclear Science and Technology, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
  • 2.  Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
Fund Project:  Supported by National Natural Science Foundation of China(11175240, 11205234, 11322550) and Program for Changjiang Scholars and Innovative Research Team in University(IRT1280)

Abstract: Due to high reflectivity and high resolution of X-ray pulses, diamond is one of the most popular Bragg crystals serving as the reflecting mirror and mono-chromator in the next generation of free electron lasers(FELs). The energy deposition of X-rays will result in thermal heating, and thus lattice expansion of the diamond crystal, which may degrade the performance of X-ray FELs. In this paper, the thermal loading effect of diamond crystal for X-ray FEL oscillators has been systematically studied by combined simulation with Geant4 and ANSYS, and its dependence on the environmental temperature, crystal size, X-ray pulse repetition rate and pulse energy are presented. Our results show that taking the thermal loading effects into account, X-ray FEL oscillators are still robust and promising with an optimized design.

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