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. ©, 2015, Editorial Office of High Power Laser and Particle Beams. All right reserved.