采用了人工线、开关和直线变压器结构一体化的设计方法,为重复运行的长脉冲直线变压器驱动源(LTD)装置研制了一种紧凑型低阻抗脉冲成形模块。为优化空间结构、减小分布参数、提高波形质量,脉冲单模块由两条20 Ω Blumlein 脉冲成形网络（PFN）并联储能,人工线采用相向L型布局,通过一个同轴开关同步放电,分两路向直线变压器初级线圈对称馈入快前沿的高压电脉冲。为了进一步减小线路电感,缩短脉冲前沿,研制了新型的嵌入式激光触发开关。与同轴开关相比,引线长度缩短了一半,脉冲前沿减小了10%。两级LTD模块实验装置在18.5 Ω负载上获得了电压240 kV、半宽180 ns的脉冲输出,重复频率可达25 Hz。

A compact low impedance pulse forming module in long pulse linear transformer driver(LTD) working repeatedly is designed by integrating Blumlein pulse forming network（PFN）, switch and linear transformer. In order to optimize configuration, reduce distribution parameters and improve waveform, each module consists of two 20 Ω Blumlein PFN which is designed in L-type. A coaxial switch drives two PFNs, and high voltage pulse feeds symmetrically primary coil of LT. A built-in laser trigger switch is developed for cutting down inductance and decreasing risetime of pulse. Comparatively this switch shortens its down-lead by 50%, and risetime is reduced by 10%. The LTD experimental device of two stages produces pulses with voltage of 240 kV and duration of 180 ns at 25 Hz repetitive rate in a resistance load of 18.5 Ω.