详细分析了中国散裂中子源(CSNS)直线加速器低能端预切束电源工作原理。切束束团上升沿和下降沿的快慢是衡量切束电源性能好坏的重要指标, 经过研究, 研制了一台脉冲幅值6 kV, 前后沿纳秒级的切束腔电源, 应用纯硬件电路代替软件的方法实现高频和低频定时信号的同步和与处理, 使该电源输出稳定可靠的高压脉冲。该电源基于直流高压加快速高压开关的设计方案来实现高压、高重复频率及纳秒级快沿的脉冲输出, 具有多脉冲和单脉冲两种工作模式, 满足了直线加速器单束团和多束团注入到快循环质子同步加速器(RCS)的要求。CSNS直线加速器切束实验的结果表明, 切束电源满足各项设计指标要求。

This paper present the detailed analysis of the principle of chopper power supply of China Spallation Neutron Source (CSNS ) linear accelerator.The rising edge and the falling edge of the chopped beam bunch are important indexes of the performance of the chopper power supply. Based on the research, a chopper power supply with pulse amplitude of 6 kV and nanosecond grade edge is developed.The method of pure hardware circuit instead of software is used to realize the synchronization and AND processing of high frequency and low frequency signals, which can make the power supply output stable and reliable high voltage pulse.The power supply has two modes (multi pulse and single pulse) to meet the requirements of single beam or multi beam injection into the Rapid Cycling Synchrotron(RCS) ring.The results of the CSNS linac beam chop experiment show that the power supply meets all the design requirements.