Application of particle track system BEPC test beam

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.