基于粒子-蒙特卡洛模型的气体电子倍增探测器的研究

Simulation of a gas electron multiplier using a PIC-MCC model

采用粒子-蒙特卡罗模型(Particle in Cell-Monte Carlo Collision,PIC-MCC)对气体电子倍增探测器(Gas electron multiplier,GEM)的倍增放大过程进行了模拟,这对更好的理解和把握GEM的物理机理具有重要的意义。在电场分析的基础上,从GEM空间粒子数和粒子的空间分布随时间的变化分析GEM的倍增过程,并建立GEM增益和各边界层收集到的电子个数之间的关系。研究结果为进一步利用该模型对GEM优化结构、选择工作参数及探讨物理机理建立了基础。

In this paper,a particle in cell-Monte Carlo collision model is used to investigate the process of electron avalanches in gas electron multiplier（GEM）,which is of great benefit to understand the GEM physics mechanism.Based on analysis of the electric field effect,electron avalanches are investigated with the time-related particle numbers and distributions in the GEM space.The relations between the GEM gain and the particle numbers deposited on the boundaries are analyzed,too.The simulation results lay the foundation for optimizing the GEM structures,working conditions based on PIC-MCC model.