用于GPPD谱仪的大面积闪烁体中子探测器性能测试  

Performance Test of the Array Scintillator Detector with a Large Area for GPPD

作　　者：黄畅 唐彬[2,3] 刘云 陈少佳 王修库[2,3] 孙志嘉 陈元柏[2,3] 姚泽恩 HUANG Chang;TANG Bin;LIU Yun;CHEN Shaojia;WANG Xiuku;SUN Zhijia;CHEN Yuanbo;YAO Zeen(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;Institute of High Energy Physics,Chinese Academy of Sciences,Dongguan Branch,Dongguan 523803,Guangdong,China;Spallation Neutron Source Science Center,Dongguan 523803,Guangdong,China;State Key Laboratory of Particle Detection and Electronics,Beijing 100049,China)

机构地区：[1]兰州大学核科学与技术学院,兰州730000 [2]中国科学院高能物理研究所东莞分部,广东东莞523803 [3]散裂中子源科学中心,广东东莞523803 [4]核探测与核电子学国家重点实验室,北京100049

出　　处：《原子核物理评论》2019年第2期190-196,共7页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(U1832111,11875273);广东省自然科学基金项目(2016A030313126,2015A030310006)~~

摘　　要：中国散裂中子源(Chinese Spallation Neutron Source, CSNS)的建成为中子散射技术的发展和应用奠定了基础。通用粉末衍射谱仪(general purpose powder diffractometer, GPPD)是CSNS一期建设的三条谱仪之一。研制了用于GPPD的大面积闪烁体探测器阵列,在CSNS的BL20中子束线上开展了探测器关键性能参数的实验测试。测试结果显示,对波长为1.4A和2.8A的中子,其探测效率分别为(38.5±1.7)%和(56.1±1.1)%,模拟与实验相结合,给出对2A的中子,其探测效率约为(46.1±2.0)%,有效面积内的探测效率不均匀度约为19.6%,经优化后可以降低到14.9%;探测器位置分辨可以达到4.0 mm×4.0 mm,最高计数率约79 kHz。探测器单元的整体性能指标能满足GPPD的物理需求。The construction of Chinese Spallation Neutron Source(CSNS) laid the foundation for the development and application of neutron scattering technology General Purpose Powder Diffractometer(GPPD), which is one of the three spectrometers of CSNS in the first phase. The large area scintillator detector array for GPPD was developed and the key performance parameters of the detector has been tested on the BL20 of CSNS. The test results showed that the detection effciency for 1.4 A and 2.8 A neutrons is(38.5±1.7)% and(56.1±1.1)%respectively. In accordance with simulation results, the detection effciency is about(46.1±2.0)% for 2.0 A neutrons. The position resolution of the detector is 4.0 mm×4.0 mm, the maximun counting rate is about 79 kHz and the count nonuniformity is about 19.6% and reduced to 14.9% after optimization. The performance of the detector unit can fulfill the physical requirements of GPPD.

关 键 词：中国散裂中子源 通用粉末衍射谱仪 闪烁体探测器 探测效率 位置分辨 

分 类 号：TL812[核科学技术—核技术及应用]