利用简单的理论和电路模拟的方法,分析了爆磁压缩发生器或电容器通过变压器对脉冲形成线充电过程中的预脉冲现象.研究表明由变压器副边电感和脉冲形成线电容构成的回路充电频率和接地电感的大小是影响预脉冲电压幅值的主要因素.由于接地电感的引入带来的高频寄生振荡不会引起预脉冲幅值的变化.在通过变压器对脉冲形成线充电的方案中,由于回路充电频率低,预脉冲电压幅值很小,只有kV量级.在电容器通过变压器为脉冲形成线充电的脉冲功率调制器中,将预脉冲开关去掉进行了实验,并与有预脉冲开关的情况进行了对比,结果发现无预脉冲开关的情况下,不影响二极管的正常工作和产生电子束的质量.

The pre-pulse phenomena are studied by the simple theoretical analysis and the method of electro-circuit simulation in a PFL charging-up by MFCG or capacitors. It is shown that what affect the amplitude of pre-pulse voltage are the grounding inductance and the frequency of the charging loop circuit, which is determined by the secondary coil inductance of transformer and the capacitance of PFL. The parasitical oscillation with high frequency introduced by the grounding inductance doesn't change the peak value of pre-pulse voltage. The frequency of the charging loop circuit is low enough that the peak pre-pulse voltage is only on kV level as PFL is charged through a transformer. The experiments are carried out when the PFL is charged by capacitors through a pulse transformer in two cases that the pulse power modulator is with or without pre-pulse switch.