使用六氟化硫 (SF6)及其混合气体做绝缘介质, 并提高工作气压, 增加绝缘强度, 利于实现Marx发生器的小型化、轻量化。为保障 Marx发生器的顺利建立, 一般需要使用触发电源。某些场合下, 去掉触发源, Marx依靠开关自击穿建立, 可提升 Marx发生器的使用便利性, 降低维护难度。搭建了 14级气绝缘 Marx发生器, 当工作气压逐渐升高时, Marx发生器依靠开关自击穿建立变得困难。对 Marx发生器建立过程进行理论分析及开关电极的优化验证实验, 改进了 Marx发生器开关的电极形状及组合形式。实验表明, 改进后的 Marx发生器在高气压下的自击穿建立概率提高了。研制的 Marx发生器工作在 0.25 MPa的六氟化硫下, 结构紧凑, 体积较小, 在 45 .的水负载上获得约7 GW, 脉宽70 ns的电压输出。ZHANG Beizhen, WANG Ganping, SONG Falun, LUO Guangyao, YANG Xiaoliang

As a High Power Microwave(HPM) driver, in order to achieve minimization and lightweight, a Marx generator is usually immersed in SF6 or a mixture which contains it. Raising the gas pressure, which would improve the insulation, will facilitate the reduction of the Marx volume. Usually, an external trigger is utilized to ensure the erection of Marx generator. For simplicity and convenience, an attempt of discarding the trigger and erecting the Marx only by self-break spark gaps is made. A 14-stage Marx is established and experiments on that show it is very difficult to erect a Marx when pressure is higher than0.16 MPa. By analyzing the erection process and optimizing the shape of electrode in spark gaps, a serialof experiments are conducted, and the results indicate that the erecting probability is improved. Finally, a compact Marx generator, working in 0.25 MPa SF6 withouttrigger, is established, and a 7 GW,70 ns output is obtained on a 45 . load.