Performance test of the low-pressure thin window multi-wire chamber  

作　　者：张俊伟 鲁辰桂 段利敏 马龙 胡荣江 杨贺润 马朋 甘再国 

机构地区：[1]University of Chinese Academy of Sciences [2]Institute of Modern Physics, Chinese Academy of Sciences

出　　处：《Chinese Physics C》2014年第2期57-60,共4页中国物理C（英文版）

基　　金：Supported by NNSFG-CAS Joint Fund for Research Based on Large-scale Scientific Facilities(10979064);Major State Basic Research Development Program of China(973 Program)(2010CD834204);National Natural Science Foundation of China(11205221)

摘　　要：A flow gas low-pressure multi-wire proportional chamber（LPMWPC） with an active area of 180 mm× 80 mm has been developed for the flying time test of the recoil nuclei on super heavy nuclear experiments. The LPMWPC detector can be operated in single as well as double step operational modes. In the case of double step operational mode with a high gas amplification factor, signals from α-particles reside well above the electronic noise. The gas leakage rate and time resolution obtained from the α239Pu source are shown and discussed at the condition of 3 mbar Isobutane gas. It was shown that the time resolution was better than 2.9 ns at the best work condition, and the detecting efciency was larger than 98% at the low energy α particles. So the LPMWPC is fit to measure the flying time in the super heavy nuclear fragments experiment.A flow gas low-pressure multi-wire proportional chamber（LPMWPC） with an active area of 180 mm× 80 mm has been developed for the flying time test of the recoil nuclei on super heavy nuclear experiments. The LPMWPC detector can be operated in single as well as double step operational modes. In the case of double step operational mode with a high gas amplification factor, signals from α-particles reside well above the electronic noise. The gas leakage rate and time resolution obtained from the α239Pu source are shown and discussed at the condition of 3 mbar Isobutane gas. It was shown that the time resolution was better than 2.9 ns at the best work condition, and the detecting efciency was larger than 98% at the low energy α particles. So the LPMWPC is fit to measure the flying time in the super heavy nuclear fragments experiment.

关 键 词：LPMWPC gas leakage rate time resolution detecting efciency 

分 类 号：O571[理学—粒子物理与原子核物理]