【作者】 田立朝； 王小胡； 孙志嘉； 陈元柏； 杨桂安； 刘荣光； 张建；

【Author】 TIAN Lichao1 WANG Xiaohu1 SUN Zhijia1 CHEN Yuanbo1 YANG Gui-An1 LIU Rongguang1 ZHANG Jian1 1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049

【机构】 中国科学院高能物理研究所；

【摘要】 根据中国散裂中子源多功能反射谱仪的需求中国科学院高能物理研究所气体探测器一组设计制作了一个基于多丝正比室的有效面积为200mm*200mm的二维位置灵敏热中子探测器。采用重心法实现位置读出,工作气体为6atm3He+2.5atmC3H8。为防止探测器工作过程中丙烷分解产物吸附在阳极丝上使探测器老化,保证气体纯度,制作了一套气体净化系统。但是由于气密性不佳,探测器无法长时间工作,对原有气路进行了改进,并对探测器的性能进行了初步测试,探测器能够正常工作。更多还原

【Abstract】 A thermal neutron detector was constructed by the Institute of High Energy Physics for the Multifunction Reflection Spectrometer of China Spallation Neutron Source. It is based on a multiwire proportional chamber (MWPC) with Gravity center readout system and has a sensitive area of 200mm*200mm. It operates with a gas mixture of 6atm 3He+2.5atm C3H8. A gas purifier was made to prevent the attachment of the decomposition of C3H8 on the anode and keep the purity of the gas. But because of the bad air tightness the detector cannot keep working for a long period. The gas system was improved and the detector was Preliminary tested. The results show that the detector can work normally.更多还原