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

作     者：Song Meiqi Zhang Qingmin Guo Yuhang Li Kai Deng Haixiao 

作者机构：Department of Nuclear Science and Technology School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 

出 版 物：《Chinese Physics. C》 

年 卷 期：2016年第40卷第4期

页      面：048101-01-048101-01-048101-05页

学科分类：07[理学] 0702[理学-物理学] 

基　　金：国家自然科学基金 国家教育部长江学者与创新团队发展计划 

主　　题：X-ray pulse diamond crystal energy deposition X-ray FEL oscillator 

摘      要：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.