Development of driving power supply for short pulse high yield neutron generator
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摘要: 真空弧中子发生器是一种短脉冲高产额的中子源，被广泛应用在石油测井、元素活化分析等领域。真空弧中子发生器的典型特点是放电弧流大、脉宽短，为此研制了一套大电流的真空弧放电及其引出电源，包含触发模块、主弧模块和引出模块等。触发模块为LRC放电，输出电压峰值大于5 kV。主弧模块采用LRCD半周期放电方式产生主弧电流，电流峰值大于600 A，半高宽大于0.5 μs。引出模块使用多倍压整流电路，将交流高压整流成所需的高压直流，输出电压峰值大于120 kV，负载电流大于2 A。根据设计方案建立了仿真模型，仿真结果表明该电源能很好地输出设定的电参数。最后制备了一套大电流真空弧放电及引出电源，测试结果表明该电源输出参数和设计值一致，可用来作为真空弧中子发生器驱动电源。Abstract: Vacuum arc neutron tube is a neutron source with high pulse neutron yield. It is widely used in oil logging, element activation analysis and other fields. One of the typical characteristics of vacuum arc neutron tube is large discharge arc current and short pulse width. A set of vacuum arc discharge and extraction power supply with large current is developed, including trigger module, main arc module and extraction module. The trigger module uses LRC discharge mode, and the peak output voltage is 5 kV. The arc module uses LRCD half-cycle discharge mode to generate the main arc current. The peak current is 600 A, and the half-height width is about 0.5 μs. The extraction module uses a multi-voltage rectifier circuit to rectify AC high-voltage into the required high-voltage DC, with an output voltage of 120 kV and a load of 2 A. The simulation model is established according to the design scheme, and the simulation results show that the power supply can output the set electrical parameters well. Finally, a high-current vacuum arc discharge and extraction power supply is fabricated. The test results show that the output parameters of the power supply are consistent with the design values, and the power supply can be used to drive a vacuum arc neutron tube.
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Key words:
- vacuum arc discharge /
- high current /
- LRC pulse discharge /
- LRCD discharge /
- Voltage doubling circuit
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