【作者】 管亮； 郭军军； 汪晓莲； 许咨宗；

【Author】 Guan Liang, Guo Jun-Jun, Wang Xiao-Lian, Xu Zi-Zong (University of Science and Technology of China, HeFei 230026)

【机构】 中国科学技术大学；

【摘要】 本文介绍了使用编织丝网做雪崩电极的微网格气体探测器的电子透过率和离子反馈的模拟研究结果。使用简化的三维模型构建了探测器电场并运用蒙特卡罗方法模拟电子和离子在探测器区间的漂移运动状况。讨论并解释了气体成分不同对于探测器中丝网的电子透过率的影响。通过模拟,比较了同样光学透过率下不同丝径的丝网中电子的透过率和离子反馈随电场的变化。给出的结果表明相同透过率下两个研究的量变化是不同的,这说明丝网网孔的大小在决定电子透过率与离子反馈时具有重要的作用,模拟结果可以帮助实验优化丝网的选择。更多还原

【Abstract】 In this paper we report our simulation work on the electron transparency and the ion feedback in Micromegas detector with woven wire meshes. A simplified 3D model is build to generate electric field in the detector and to perform Monte Carlo simulation of electron and ion drift behaviors. Influence of the gas mixture to the electron transparency and ion feedback is discussed and explained. Comparison of electron transparency and ion feedback with meshes which have same optical transparency and different wire diameter show different variation trends. This indicates the important role the hole size has played in the determination of the two parameters discussed in the paper. This work might be helpful to the optimization of the detector design.更多还原