Design and optimization of resistive anode for a two-dimensional imaging GEM detector  

作　　者：鞠旭东 董明义 赵逸琛 周传兴 欧阳群 

机构地区：[1]State Key Laboratory of Particle Detection and Electronics, Beijing 100049, China [2]Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China [3]University of Chinese Academy of Sciences, Beijing 100049, China [4]Zhengzhou University, Zhengzhou 450001, China

出　　处：《Chinese Physics C》2016年第8期90-95,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11375219);CAS Center for Excellence in Particle Physics(CCEPP)

摘　　要：A resistive anode for two-dimensional imaging detectors, which consists of a series of high resistivity pads surrounded by low resistivity strips, can provide good spatial resolution while reducing the number of electronics channels required. The optimization of this kind of anode has been studied by both numerical simulations and experimental tests. It is found that to obtain good detector performance, the resistance ratio of the pads to the strips should be larger than 5, the nonuniformity of the pad surface resistivity should be less than 20%, a smaller pad width leads to a smaller spatial resolution, and when the pad width is 6 mm, the spatial resolution （a） can reach about 105 μm. Based on the study results, a 2-D GEM detector prototype with optimized resistive anode is constructed and a good imaging performance is achieved.A resistive anode for two-dimensional imaging detectors, which consists of a series of high resistivity pads surrounded by low resistivity strips, can provide good spatial resolution while reducing the number of electronics channels required. The optimization of this kind of anode has been studied by both numerical simulations and experimental tests. It is found that to obtain good detector performance, the resistance ratio of the pads to the strips should be larger than 5, the nonuniformity of the pad surface resistivity should be less than 20%, a smaller pad width leads to a smaller spatial resolution, and when the pad width is 6 mm, the spatial resolution （a） can reach about 105 μm. Based on the study results, a 2-D GEM detector prototype with optimized resistive anode is constructed and a good imaging performance is achieved.

关 键 词：resistive anode GEM two dimensional detector spatial resolution imaging distortion 

分 类 号：O572.212[理学—粒子物理与原子核物理]