快前沿mini-Marx发生器研制

 介绍了mini-Marx发生器的工作原理，总结了快mini-Marx发生器的设计原则。设计了一台10级单极性同轴结构的mini-Marx发生器。设计上将火花开关排成一排,借用前级开关强烈的紫外光以预电离下一级火花开关从而达到可靠运行，利用开关与屏蔽外筒间的结构电容来锐化高压脉冲的输出，同时采用紧凑性、低电感设计来获得快前沿的输出。发生器储能70 J，在70 Ω负载上获得了前沿6 ns、脉宽40 ns、幅度210 kV的高压脉冲。实验结果表明设计合理可行，达到了脉冲功率系统的小型化设计、获得了快前沿高幅度的高压脉冲。很好地满足了脉冲功率系统对快前沿高压脉冲的需求。用它直接驱动闪光X射线二极管，在距光源25 cm处获得了剂量大于7.7×10^-6 C/kg的闪光X射线。

Development of fast risetime mini-Marx generator

A 10-stage 200 kV mini-Marx generator based on wave erection principle has been designed in coaxial structure. The capacitors, connecting switches and metallic enclosures, lead to the establishment of a fast pulse forming line. And fast risetime is achieved through the proper design of the stray capacitance and inter stage capacitance, in concern with coupling the spark gaps via ultra-violet energy. The generator was demonstrated to deliver pulses of more than 210 kV onto a 70 Ω load with 40 ns pulse width and 6 ns risetime. With a flash X-ray tube integrated directly into the generator as a load, the formed flash X-ray system could generate a dose of 7.7×10－6 C/kg at 25 cm away for flash X-radiography．