多丝室在北京试验束中的应用  

Application of multiwire proportional chamber in BEPC test beam

作　　者：沈激[1] 陈子瑜[1] 叶云秀[1] 崔象宗[2] 李家才[2] 

机构地区：[1]中国科学技术大学近代物理系,合肥230026 [2]中国科学院高能物理研究所,北京100049

出　　处：《强激光与粒子束》2006年第4期663-666,共4页High Power Laser and Particle Beams

基　　金：BEPC重大改造工程项目经费资助课题

摘　　要：介绍了北京正负电子对撞机直线加速器附设e,π试验束多丝室的结构及工作机理。该室间隙6 mm,窗口面积80 mm×80 mm,位置灵敏面积50 mm×50 mm;阳极丝和阴极丝分别采用直径为20μm和50μm镀金钨丝,阳极丝距2 mm,阴极丝距0.7 mm,每6根阴极丝并联构成阴极条,阴极条间距4.2 mm。采用阴极条感应重心读出分辨位置,对5.9 keV的γ光子,获得优于0.3 mm(FWHM)的位置分辨;对1.1 GeV电子束流,获得0.224 mm(FWHM)的位置分辨。This paper describes a Multiwire Proportional Chamber （MWPC） for the Test Beam on BEPC（Beijing Electron Positron Colider）. The distance between the anode surface and the cathode surface of the MWPC is 6 mm. Both surfaces are made of gold-plated tungsten wires, the anode wires are 20μm in diameter and 2 mm apart, and the cathode wires are 50μm indiameter and 0. 7 mm apart. Six adjacent wires are connected together to form a 4.2 mm wide cathode strip. The MWPC can localize the particles of e,π by cathode-induced charge centre-of-gravity read-out. For 5.9 keV γphoton, the positional resolution is less than 0.3 mm （FWHM） and for 1.1 GeV beam electron, 0.224 mm （FWHM） positional resolution is attained.

关 键 词：北京正负电子对撞机 试验束 阴极感应 重心读出 多丝室 位置分辨 

分 类 号：TL815[核科学技术—核技术及应用]