Thyratron trigger characteristics analysis of CSNS kicker power supply
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摘要: 针对中国散裂中子源kicker电源的闸流管，研制了基于大电流脉冲预电离和高压脉冲点火原理的双脉冲触发器，提高了闸流管的触发导通稳定性；同时研究了氢流、灯丝电流及预点火电流等参数对闸流管状态的影响；针对闸流管误漏触发现象，研制了基于单稳态及逻辑门电路构成的误漏触发检测电路，能够对闸流管的状态进行准确分析及预判；最后对kicker脉冲电源系统进行了年度分析总结。
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关键词:
- kicker脉冲电源 /
- 氢闸流管 /
- 闸流管触发器 /
- 误漏触发
Abstract: Hydrogen thyratron still plays an important role in the field of high voltage and high current technology, how to adjust the working parameters of thyratron is an important topic in pulse modulation technology. The performance and life of thyratron depend on thyratron trigger to a great extent. To optimize the performance of thyratron and make it preionize more sufficiently, the high current pulse preionization technology is adopted by analyzing the thyratron triggering characteristics. A thyratron double pulse trigger based on kicker pulse power supply of China spallation neutron source is developed. The trigger has excellent performance such as nanosecond rising edge, low jitter and high current output. The effects of different reservoir heater current, cathode heater current and pre-ignition parameters on the thyratron state are studied, aiming at the problem of mis-conduction and leak conduction of thyratron, a detection circuit based on monostable circuit and CMOS gate circuit is developed, which can accurately analyze and predict the state of thyratron. Finally, the fault of kicker pulse power supply system is analyzed and summarized annually. -
图 3 闸流管双路触发高压脉冲及触发器与闸流管连接示意图
Figure 3. Schematic diagram of high voltage pulse triggered by thyratron and connection between trigger and thyratron
图 6 触发器空载及带闸流管负载下的输出波形
Figure 6. Output waveform of trigger under no load and thyristor load
图 7 闸流管负载下的预点火电流波形
Figure 7. Output waveform of trigger under no load and thyristor load
图 9 不同灯丝电流、氢流参数下预点火电流波形变化
Figure 9. Variation of preignition current waveform under different reservoir heater current, cathode heater current
图 10 闸流管误漏触发检测电路原理及逻辑
Figure 10. Principle and logic of thyratron mis-conduction and leak conduction
图 11 最近三年运行kicker脉冲电源系统故障时间、闸流管误/拒触发次数、闸流管目前使用寿命
Figure 11. Fault time number，false / refused triggering and current service life of thyristor of kicker pulse power supply
表 1 引出kicker脉冲电源设计指标
Table 1. Design index of kicker pulse power supply
excitation current/A rise time/ns flat top width/ns repetition rate/Hz flat top flatness/% 6660 ＜265 ＞600 25 ＜±1 
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表 2 CX1925X闸流管参数表
Table 2. CX1925X thyratron parameters
peak forward anode voltage/kV peak forward anode current/kA peak reverse anode current/ kA rate of rise of current/(kA/s) 80 15 10 100
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表 3 双路触发高压脉冲参数
Table 3. Parameters of double trigger high voltage pulse
Grid 1 pulse voltage/V Grid 2 pulse voltage/V Grid 2 rate of rise/kV/s Grid 2 delay/s Grid 1 current/A 600～2000 1000～2000 ＞10 0.5～3.0 10～25
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表 4 CSNS/RCS引出kicker脉冲电源年度统计
Table 4. Annual statistics of kicker pulse power failure
trigger grid1 pulse voltage/V grid2 pulse voltage/V rate of rise grid2 pulse/(kV/s) grid1 drive current/A jitter/ns failure time/h self developed trigger 1500 2200 38 10～25 2 1.3 MA2709A 800 1600 18 15 5 trigger2 1000 1500 17 15 5 5.63
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