1 MV小型重复频率Marx发生器研制

设计了MV级小型重复频率Marx发生器,简化了发生器充放电回路,减小了能量损失；分析了隔离电感变化时对发生器输出脉冲电压波形的影响,减小了隔离电感体积,提高了隔离有效性；优化了开关腔体结构,实现了间距连续可调,且受外围结构的变化或振动影响,13个开关间隙置于同一垂线上,火花放电时产生的紫外线或射线相互照射,加速了开关导通,减小了Marx发生器输出电压抖动。塑壳电容降压使用,提高了发生器的可靠性；通过Pspice模拟和三维静电场分析,实现了发生器小型化,整个Marx发生器放置在一个密封纯净SF6气体的金属圆筒内,体积小于0.25 m3。优化设计和实验研究,发生器在高阻负载上输出峰值1.02 MV、前沿约30 ns的高压脉冲,发生器储能290 J,电压幅度抖动约10%,前沿抖动小于10 ns,可实现重复频率20 Hz稳定运行。

Design of a 1 MV compact repetitive Marx generator

A megavoltage compact and repetitive Marx generator is designed. The charge-discharge circuit is simplified, and the energy loss is also decreased; The effect of isolating inductance change on the output pulse voltage waveform from generator is analysed. The volume of isolating inductors is reduced, and the validity of isolation is also improved; The chamber structure of switch is optimized. The continuous adjustment of space is realized, which is not affected by the change of peripheral structure and oscillation. Thirteen gaps lie in the same vertical line. The ultraviolet ray or radioactive ray excited by spark discharge are mutually irradiated, which accelerate switch conduction and decrease output voltage jitter of the Marx generator. Plastic case capacitors are used under decreased voltage, which improve the reliability of the generator. The miniaturization of generator is realized by Pspice simulation and three-dimensional static electric field analysis. The entire Marx generator is laid in a sealed metal cylindrical shell with pure SF6, whose volume is less than 0.25 m3. By means of optimal design and experimental research, the generator has the following parameters: The output peak voltage on high-impedance load is 1.02 MV, the rise time is about 30 ns, the energy storage is 290 J, the voltage magnitude jitter is about 10%, the rise time jitter is less than 10 ns, and the system can operate stably under 20 Hz repetition rate.