BEPC试验束多丝室性能  

Performance of the MWPC for the Test Beam on BEPC-LINAC

作　　者：沈激[1] 陈子瑜[1] 叶震宇[1] 蒋林立[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,安徽合肥230026 [2]中国科学院高能物理研究所,北京100039

出　　处：《中国科学技术大学学报》2005年第6期815-820,共6页JUSTC

基　　金：国家BEPC改进专项经费.

摘　　要：描述了北京正负电子对撞机直线加速器附设e、π试验束描迹用的多丝正比室.室灵敏面积为67mm×67mm,阳极信号给出粒子能量,二维阴极感应脉冲重心读出法给出粒子坐标.实验表明,当工作气体为80%氩20%二氧化碳混合气体,工作电压为3700V时,对55Fe5·9keV光子阳极能量分辨达到17%,五点读出法位置分辨达到0·11mm标准差,满足了试验束描迹仪给出的要求.文中介绍了室结构、制造工艺和性能研究,分析了几种函数拟合位置读出和重心位置读出的特点.The multiwires proportional chambers （MWPCs） which localize the particles for the e/π test beam on Beijing electron and positron collider （BEPC） are described. Its sensitive area is 67 mm× 67 mm and the anode signal gives out particle energy. Induced charges on the cathode strips give out the coordinates of particles. It is shown that the spatial resolution of the chambers resulting from the method of gravity center readout is obtained at 0. 11 mm of standard error and their energy resolution reached 17% for SSFe 5.9 keV γray, which sufficiently meets the measurements of the particle needs. The configuration, constructions, techniques and the investigation of performance are presented, and the characters of the method of gravity center readout with the fitting methods are analyzed.

关 键 词：北京正负电子对撞机 试验束 阴极感应 多丝正比室 

分 类 号：TL81[核科学技术—核技术及应用]