螺旋线型脉冲形成线匝间击穿与输出波形的研究

 针对螺旋线型脉冲形成线放电过程的匝间击穿问题，采用数值模拟的方法研究了影响螺旋线上轴向电场的因素，模拟结果表明：螺旋线的螺旋角越大、开关的上升沿越小、负载的阻值越小则越容易造成匝间击穿；针对输出波形的前沿上冲和下凹问题，通过数值模拟和实验方法研究了加速器内阻抗不匹配段对输出波形的影响，结果表明: 改变螺旋线与开关之间连接段的阻抗以及开关和二极管之间过渡段的阻抗，使之接近于螺旋线阻抗，并使电长度减小，可以消除波形的前沿上冲和下凹，得到近似方波的高电压脉冲输出。

Breakdown between adjacent turns and output waveform of helix pulse forming line

To investigate the problem of breakdown between the adjacent turns of the helix pulse forming line(PFL),the influences on the axial electric field of the helix PFL were analyzed numerically.Numerical results indicated that it was easier to breakdown between the adjacent turns if the helix angle was bigger,the rise time of the switch or the load value was smaller.To study the problem of the upshot and hollow on the output pulse,the influences on the waveform caused by the impedance mismatched sections in helix PFL accelerator were analyzed numerically and experimentally.An approximate square high voltage pulse was obtained by making the impedances of the joint section(between the helix line and switch) and the transition section(between switch and load) close to that of the helix line and minishing their electric lengths.