Monte-Carlo方法模拟单GEM空间分辨率的研究
Study of spatial resolution in a single GEM simulated by Monte-Carlo method
摘要：
鉴于X射线照相术和UV、可见光成像，空间分辨率是GEM性能的重要因素。用蒙特卡罗方法研究了器件中横向扩散对空间分辨率的影响。仿真结果表明，诸如漂移区和感应区的GEM电压和电场等电参数对空间分辨率的影响很小。另一方面，所选择的几何参数和工作气体是决定空间分辨率的主要参数。空间分辨率更多地取决于漂移和扩散过程，而不是雪崩过程。特别是对于不同的工作气体，电子扩散系数与迁移率之比的平方根函数对空间分辨率有显著的影响。
英文摘要：
Spatial resolution is a significant factor in the GEM performance in view of X-rays radiography and UV, visible light imaging. Monte-Carlo method is used to investigate the spatial resolution determined by the transverse diffusion in the device. The simulation results indicate that the electrical parameters, such as the GEM voltages and the electric field at the drift and induction regions, only have minor effects on the spatial resolution. The geometrical parameters and the working gases chosen, on the other hand, are the main parameters that determine the spatial resolution. The spatial resolution is determined more on the drift and diffusion processes than on the avalanche process. Especially for the different working gases, the square root function of the ratio of the electron diffusion coefficient and the mobility has a significant effect on the spatial resolution.
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