CSNS离子源引出电源关键技术研究  

Key technology of extraction power based on CSNS ion source

作　　者：李海波[1,2] 沈莉[1,2] 周国仲[1,2] 翟军[1,2] 

机构地区：[1]中国科学院高能物理研究所东莞分部东莞523803 [2]东莞中子科学中心东莞523803

出　　处：《核技术》2015年第6期61-66,共6页Nuclear Techniques

摘　　要：详细分析了中国散裂中子源(China Spallation Neutron Source,CSNS)直线加速器前端离子源引出电源工作原理,针对设计指标要求,提出了一种由40个功率MOSFET管串联组成的高压调制电路方案。在引出脉冲电源系统中对多个MOS管串联存在的问题,包括MOS管串联均压、保护电路、MOS管驱动信号一致性等关键问题进行了分析研究,并给出了有效的解决办法。最后在一台输入为AC220V、脉冲幅值25 k V、脉冲电流600 m A、平均功率为375 W输出的试验样机上验证了理论分析的正确性。经测试,实验结果表明离子源引出脉冲电源满足各项设计指标要求。Background： The performance of the ion source of China Spallation Neutron Source （CSNS） starting point directly determines the success or the failure of the CSNS project, and the extracted power plays a key role in the ion source. Purpose： This study aims to resolve the critical issues including the MOS tube over-voltage, MOS tube protection circuit and the consistency of driving signal in the multiple MOS tubes working in serial structures. Methods： A high voltage modulation circuit schemed by 40 MOSFET power tubes is designed to inter-connect in series to the obtain high-voltage pulse. A high-frequency transformer of 40 secondary groups is applied to solve MOS tube consistency of driving signal issue with the same resistance in MOSFET drain source to protect MOS tube is not damaged. Results： The correctness of a prototype ion-extraction power supply of AC220V input and output average power of 375 W is verified by theoretical analysis. The experimental results show that the power supply outputs peak pulse voltage of 25 kV, with pulse width of 900 gs pulse current of 600 mA, pulse jitter of 15 ns. The repetition rate is 25 Hz, and the pulse rise time is 200 ns. Conclusion： The power supply meets the requirements for ion source extraction of the negative hydrogen and lays the foundation for the stable operation of CSNS ion source for a long time.

关 键 词：高压调制电路 功率MOSFET管串联 高频变压器 

分 类 号：TL51[核科学技术—核技术及应用]