摘要
气体电子倍增器(GEM)因其具有较好的位置分辨以及各项同性的二维结构等优点,近年来受到了广泛的关注,在HIRFL-CSR上正在建设的低温高密核物质测量谱仪(CEE)也计划使用GEM作为TPC的读出探测器。不同电场条件下GEM探测器的传输特性对探测器的有效增益及能量分辨有较大影响。文中研究了单层GEM探测器中漂移区电场及感应区电场对探测器传输特性的影响;随后研究了双层GEM探测器的电压分配及传输区电场对探测器电荷传输性能的影响。结果表明,在单层及多层GEM探测器中,漂移区电场、传输区电场及感应区电场主要通过改变电子透过率和GEM雪崩电场强度及分布影响探测器的电荷传输性能,进而影响探测器的有效增益及能量分辨。以上实验结果表明GEM探测器是CEE-TPC读出探测器的理想选择,同时测试结果也为TPC中多层级联GEM工作点的选择提供了参考依据。
The Gas Electron Multiplier(GEM) has attracted wide attention due to its better position resolution and isotropic two-dimensional structure,GEM is also planned to be used as the TPC readout detector in CSR External-target Experiment(CEE) under construction.The transmission characteristics of GEM under different electric field conditions have great influence on the effective gain and energy resolution of the detector.In this paper the effects of the electric field in the drift region and the induction region on the transmission characteristics of the detector are performed on single GEM,and the effects of voltage distribution and electric field in induction region on the transmission characteristics of double-layer GEM detector were studied.The results show that in single and multi-layer GEM detectors,electric fields in the different region affect the transmission characteristics of the detector mainly by changing the electron transmittance and changing the avalanche field intensity and distribution of GEM,which will affect the effective gain and energy resolution of the detector finally.The above experimental results indicate that GEM detector is a good candidate for CEE-TPC readout detector and they also provide a reference for the selection of the working point of multi-layer GEM in TPC.
作者
魏向伦
鲁辰桂
张俊伟
马朋
杨贺润
邱天力
李蒙
胡荣江
段利敏
WEI Xianglun;LU Chengui;ZHANG Junwei;MA Peng;YANG Herun;QIU Tianli;LI Meng;HU Rongjiang;DUAN Limin(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;North China University Of Water Resources And Electric Power,Zhengzhou 450045,China)
出处
《原子核物理评论》
CAS
CSCD
北大核心
2020年第3期765-770,共6页
Nuclear Physics Review
基金
国家自然科学基金资助项目(11875302,11875301,11705242)。
关键词
GEM
传输性能
有效增益
能量分辨
GEM
transmission characteristics
effective gain
energy resolution
