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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 multi-wire proportional chamber with e, π test beam tracing attached to the positive / negative electron collider linear accelerator in Beijing is described. The sensitive area of the chamber is 67mm × 67mm, the energy of the particle is given by the anode signal, and the reading of the center of gravity The experimental results show that when the working gas is 80% argon 20% carbon dioxide mixed gas and the operating voltage is 3700V, the energy resolution of 55Fe5 · 9keV photonic anode can reach 17%, and the position resolution of the five reading method reaches 0.11mm Standard deviation to meet the requirements of the test beam tracer.This paper introduces the study of chamber structure, manufacturing process and performance, and analyzes the characteristics of several function fitting position readout and gravity center position readout.