Garfield模拟工作气体对涂硼MRPC热中子探测器性能的影响  

Influence of working gas on the properties of boron-coated MRPC thermal neutron detector by Garfield simulation

作　　者：单卿[1] 曾捷[1] 贾文宝[1] 凌永生[1] 黑大千[1] 魏勇红[1] 张焱[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《核技术》2014年第7期13-16,共4页Nuclear Techniques

基　　金：中央高校基本科研业务费专项资金(No.NS2012055)资助

摘　　要：多气隙电阻板室(Multi-gap Resistive Plate Chamber,MRPC)是一种新型气体探测器,具有探测效率高和时间分辨好等优点,在内层玻璃涂硼后可用于热中子探测。不同的工作气体对涂硼MRPC热中子探测器的性能有很大影响。利用Garfield模拟了不同工作气体的汤生系数η、电子吸附系数α、漂移速度v、扩散系数D等物理参数,并计算给出了MRPC的时间分辨率σt、本征探测效率ε。通过模拟结果对工作气体进行优化,为探测器的实际制作和实验测试提供必要的指导。Background： Multi-gap Resistive Plate Chamber （MRPC） is a kind of gas detector developed in 1995. Purpose： For its excellent time resolution and high efficiency, MRPC is used to detect thermal neutron by coating boron on the inner glass. Methods： The performances of the boron-coated MRPC thermal neutron detector are largely affected by the component or proportion of the working gas, so it is important to optimize the proportion of working gas. Then Garfield was used to simulate the gas parameter, such as Townsend coefficient η, electron attachment coefficient a, drift velocity v and diffusion coefficient D. Results： The time resolution σt and detection efficiency c of MRPC were calculated. Conclusion： Through the simulation, the proportion of working gas is optimized to provide necessary guidance for the fabrication of the detector.

关 键 词：关键词涂硼多气隙电阻板室(Multi-gap Resistive Plate Chamber MRPC)热中子探测器 工作气体 Garfield模拟 探测效率 时间分辨 

分 类 号：TL816.3[核科学技术—核技术及应用]