气体探测器雪崩过程的研究

Study of Avalanche of Gas Detector

基于汤逊气体放大电子雪崩模型和一定的物理假设，导出描绘气体探测器中正比模式和有限正比模式的一个统一公式．该公式很好地符合实验事实，由此还得到了描述空间电荷作用强弱的参数──等效电容以及表征探测器工作状态的参量──线性度．同时，在假定ＳＱＳ雪崩中空间电荷起重要作用的情况下，该公式很好地描述了其输出电量随高压的线性关系．

Based on Towsend's avalanche mode and some basic physical ideas,a unified formula for gas amplification working under proportional mode and limited proportional mode is deduced.This formula explains the experimental data well.By fitting the data, some important parameters are displayed.The effective capacitor describes the effect of space charges,and the linearity shows the state of the gas detector(under PM or LPM).This formula also gives some explanations on SQS mode while space charges are one of the important factors effecting the avalanche.