Electron transmission ef f iciency of gating-GEM foil for TPC  

作　　者：谢文庆 黄孟 李婷 田阳 李玉兰 李元景 

机构地区：[1]Department of Engineering Physics, Tsinghua University [2]Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education

出　　处：《Chinese Physics C》2012年第4期339-343,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(10975090);Major State Basic Research Development Pro-gram(2008CB817702)

摘　　要：In a TPC, ion feedback from the readout detector can cause a space-charge effect and distort the electrical field in the drift region. Gating is one of the effective methods to solve this problem, which can block ions at the expense of losing a certain amount of primary electrons. Compared with the traditional design with a wire structure, gating based on GEM foil is more attractive because of its simplicity. In this paper, the factors influencing the electron transmission efficiency are studied with simulations and experiments. After optimizing all these parameters, an electron transmission efficiency over 80% is obtained.In a TPC, ion feedback from the readout detector can cause a space-charge effect and distort the electrical field in the drift region. Gating is one of the effective methods to solve this problem, which can block ions at the expense of losing a certain amount of primary electrons. Compared with the traditional design with a wire structure, gating based on GEM foil is more attractive because of its simplicity. In this paper, the factors influencing the electron transmission efficiency are studied with simulations and experiments. After optimizing all these parameters, an electron transmission efficiency over 80% is obtained.

关 键 词：GEM GATING electron transmission efficiency TPC 

分 类 号：O572.21[理学—粒子物理与原子核物理]