高增益型气体电子倍增微网结构探测器的性能研究  

Study on the performance of a high-gain gas electron multiplier-MicroMegas chamber

作　　者：范胜男[1,2,3] 王波[2] 祁辉荣[1,2] 刘梅[1,2,3] 张余炼[4] 张建[1,2] 刘荣光[1,2] 伊福廷[2] 欧阳群[1,2] 陈元柏[1,2] 

机构地区：[1]核探测与核电子学国家重点实验室,中国科学院高能物理研究所,北京100049 [2]中国科学院高能物理研究所,北京100049 [3]中国科学院大学,北京100049 [4]兰州大学,兰州730000

出　　处：《物理学报》2013年第12期174-181,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11275224)~~

摘　　要：随着微结构气体探测器的不断发展,不同的探测需求相继提出.为了实现气体探测器在高增益和低打火率的条件下长时间稳定工作,结合气体电子倍增器(GEM)与微网结构气体探测器(MicroMegas)的探测优势,成功研制出一种基于GEM作为预放大的MicroMegas探测器,详细介绍了探测器结构和工作原理,并利用55Fe放射源对探测器增益、打火率、能量分辨和工作稳定性等性能进行了实验测量.分析结果显示GEM-MicroMegas探测器可以连续工作30h以上,探测器增益可以超过106,相对于无GEM膜的MicroMegas探测器,相同增益下打火率可以降低近100倍.With the continuous development of the micro-structure of gas detectors, many different new detection requirements have been proposed. For more stable working time, lower discharge rate with long term and high effective gain, a new structure detector has been designed. Combined with the detection＇s advantages of MicroMegas and gas electron multiplier （GEM）, it is composed of a MicroMagas chamber with one GEM foil as preamplifier. In this paper, the structure of the detector and detection principle are presented in detail. Using a 55Fe X-ray radioactive source in the operation mixtures gas of argon and isobutene （Ar/Iso = 95/5）, the performances of the detector gain, discharge rate, energy resolution and stable working time are investigated. Compared with standard MicroMegas detectors with no GEM foil, our detector show that a stable working time could reach more than 30 h of continuous work, the gain of the detector could exceed 106 and the discharge rate could be reduced by nearly 100 times at the same gain.

关 键 词：微网结构气体探测器 能量分辨率 增益 打火率 

分 类 号：TL811[核科学技术—核技术及应用]