CSNS束流损失监测系统前端模拟电路设计

中国散裂中子源(CSNS)束流损失监测系统利用气体电离室来探测束流损失，电离室输出信号需在前端模拟电路中进行信号处理。本工作自主设计开发了束流损失测量系统前端模拟电路，采用跨导放大的方式实现了低重复频率、低占空比、弱电离室信号的电流 电压（I-V）变换测量。同时，电路还实现了对较大束流损失的快速响应，保障加速器设备的安全运行。联机测试结果表明，该电路满足系统要求。

Analog Front End Circuit Design of CSNS Beam Loss Monitor System

The China Spallation Neutron Source (CSNS) beam loss monitor system uses gas ionization chamber to detect beam losses. The output signals from ionization chamber need to be processed in the analog front end circuit, which has been designed and developed independently. The way of transimpedance amplifier was used to achieve current-voltage (I-V) conversion measurement of signal with low repetition rate, low duty cycle and low amplitude. The analog front end circuit also realized rapid response to the larger beam loss in order to protect the safe operation of the accelerator equipment. The testing results show that the analog front end circuit meets the requirements of beam loss monitor system.