低气压双维位置灵敏多丝正比室的研制  

Development of Low Pressure Position Sensitive Multiwire Proportional Chamber

作　　者：张保国[1] 文万信[1] 魏志勇[1] 张金霞[2] 风莹[2] 谭继廉[2] 靳根明[2] 肖志刚[2] 王宏伟[2] 吴和宇[2] 李祖玉[2] 王素芳[2] 胡荣江[2] 

机构地区：[1]苏州大学放射医学与公共卫生学院,苏州215007 [2]中国科学院近代物理研究所,兰州730000

出　　处：《高能物理与核物理》2003年第11期1023-1026,共4页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10275083)~~

摘　　要：描述了为在放射性束流线上开展核反应研究而研制的灵敏面积为50mm×50mm的双维位置灵敏的低气压多丝正比室,研制的低气压多丝正比室为穿透式,在真空中使用,工作气压为8mb,透射性好,不干扰束流,放射源测试结果表明,它的x,y方向的位置双径迹分辨为1mm,用放射性束流在束测试结果表明,对30—40MeV的低Z放射性束的探测效率大于80％,适用于中能次级束实验中入射束的定位和反应中产生的带电粒子出射角度的测量。A low pressure two dimensional position sensitive multiwire proportional chamber (LPMWPC) has been developed for measurements of low Z charged particles from the nuclear reaction induced by radioactive ion beam. The detector has a 50mm x 50mm sensitive area and consists of three grids (X-position cathode Y-position) . The position is determined through delay line readout mode. The detector has good beam transparency and is also adequate to be used in vacuum . The LPMWPC has been tested at a pressure of 800Pa of n-heptane and a bias Voltage of 720V. The test results indicate that the position resolution of the chamber is Δx = Δy = 1mm and detection efficiency is larger than 80 % for the low Z particle at intermediate energies. This kind of chamber has be used to determine the direction of the incident particle .

关 键 词：低气压多丝正比室 位置分辨 延迟线读出 位置探测效率 放射性束流线 核反应 双维位置灵敏 研制 

分 类 号：O572.2[理学—粒子物理与原子核物理]