Study of a sealed high gas pressure THGEM detector and response of alpha particle spectra  

作　　者：张宇宁 刘倩 刘宏邦 谢一冈 吕晓睿 陈石 黄文谦 洪道金 郑阳恒 

机构地区：[1]University of Chinese Academy of Sciences, Beijing 100049, China [2]CAS Key Laboratory of Vacuum Physics, UCAS, Beijing 100049, China [3]Guangxi Key Laboratory for the Relativistic Astrophysics, Guangxi University, Nanning 530004, China [4]Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Chinese Physics C》2017年第4期141-148,共8页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11575193,11205240,11265003,U1431109)

摘　　要：A sealed high gas pressure detector working in pure argon is assembled.It consists of a 5 cm × 5 cm PCB THGEM（THick Gaseous Electron Multiplier）.The detector structure and experimental setup are described.The performance under high pressure（2 atm） is examined,selecting optimal voltages for the ionization region and induction region.The dependence of the shape of alpha particle spectra measured with relative gas gain on gas pressure（1.3-2.0 atm） has been studied.Eight data sets of relative gas gain versus working voltage of THGEM,expressed by weighting field E/P,are normalized,consistent with theory.The results show that the air tightness of the chamber is good,measured by a sensitive barometer and checked with gas gain.The experimental results are compared with Monte Carlo simulation of energy deposition without gas gain involved.A sealed high gas pressure detector working in pure argon is assembled.It consists of a 5 cm × 5 cm PCB THGEM（THick Gaseous Electron Multiplier）.The detector structure and experimental setup are described.The performance under high pressure（2 atm） is examined,selecting optimal voltages for the ionization region and induction region.The dependence of the shape of alpha particle spectra measured with relative gas gain on gas pressure（1.3-2.0 atm） has been studied.Eight data sets of relative gas gain versus working voltage of THGEM,expressed by weighting field E/P,are normalized,consistent with theory.The results show that the air tightness of the chamber is good,measured by a sensitive barometer and checked with gas gain.The experimental results are compared with Monte Carlo simulation of energy deposition without gas gain involved.

关 键 词：THGEM sealed detector long-term gain stability alpha particle 

分 类 号：O572.2[理学—粒子物理与原子核物理]