DPF-300脉冲X射线源同步触发系统研制
Development of synchronous trigger system for DPF-300 pulsed X-ray source
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摘要: DPF-300脉冲X射线源的同步触发系统采用三级触发：第一级由初级脉冲产生器触发氢闸流管；第二级由氢闸流管输出脉冲触发多路触发开关；第三级由多路触发开关和触发箱组成，触发主放电场畸变开关。该触发系统中多路触发开关产生负极性脉冲信号，通过耦合电容，到达开关的触发脉冲上升沿，约为40 ns，脉冲半高宽约60 ns，上升陡度大于0.67 kV/ns。能够同时触发40个同轴型场畸变开关，电压工作范围20～40 kV，不同发次触发箱输出的触发脉冲信号时间分散性小于4 ns，同一发次不同开关的放电时间分散性小于20 ns。在工作电压20 kV，主放电开关充0.115 MPa氮气时，整机负载电流达到约1 MA。Abstract: DPF-300 pulsed X-ray source is a mather-type dense plasma focus device and the synchronous triggering of 40 switches is the key of the device. This paper introduces the structural model, principle and performance of the the synchronous trigger system. The system triggers by three steps in series. Firstly, the initial pulsed generator triggers a hydrogenous thyratron. Secondly, the thyratron triggers the multi-output switch. Thirdly, the multi-output switch triggers the main discharge switch. The system can synchronously trigger 40 coaxial field distortion switches. The triggering voltage scope of activities is 20~40 kV, rise time of the triggering pulse is about 40 ns, pulsed width is about 60 ns, and the rise gradient of the triggering voltage is about 0.67 kV/ns. The triggering pulse's j
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