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Chinese Physics C> 2016, Vol. 40> Issue(4) : 048101 DOI: 10.1088/1674-1137/40/4/048101

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

  • 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

  • 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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  • References

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    [18] Stoupin S et al. Phys. Rev. Lett., 104:085901(2010)
    [19] K J Kim, An X-Ray FEL Oscillator:Promises and Challenges.(The Physics and Applications of High Brightness Electron Beams 2009 Maui, Hawaii, November 16-19, 2009)
    [20] Solid State Physics.(Tsinghua University Press, Beijing, 1989)
    [21] ko Y Shvyd', X-Ray Optics:High Energy Resolution Applications(Springer, Berlin, 2003)

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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
  • Received Date: 2015-10-15
  • Available Online: 2016-03-28
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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