%0 Journal Article %T Numerical Modeling on Thermal Loading of Diamond Crystal in X-ray FEL Oscillator %A Meiqi Song %A Qingmin Zhang %A Yuhang Guo %A Kai Li %A Haixiao Deng %J Physics %D 2015 %I arXiv %X 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 electrons 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. %U http://arxiv.org/abs/1510.04338v2