试验束能提供不同种类、一定动量的单粒子束流.用三个多丝正比室做探测器,采用阴极感应电荷重心读出的方法,由单个多丝室对粒子击中点的二维坐标进行定位,粒子在三个室平面上的二维坐标经拟合后精确地描绘出北京正负电子对撞机试验束单粒子束流的径迹及入射方向.对阴极感应电荷重心读出的理论、实现方法及数据处理做了详细论述,并给出了实验结果.

Test beam provides single particle beam for different experimentation. 3 multi-wire proportional chambers were used as detectors to describe single particle track of BEPC (Beijing Electron Positron Collider) test beam. The method of dimensional readout centroids of the charge signals induced on the cathodes of the chamber was discussed. The determination of the charge centroid gives two coordinates in one chamber. Beeline fittings of 3 two coordinates' position paints single particle track accurately. The principle and circuit of charge amplifier、data processing and analysis result was written up.