Compact low impedance Marx generator for high power microwave applications
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摘要: 研制了一套紧凑型脉冲功率源系统，用于驱动低阻抗磁绝缘线振荡器（MILO）。脉冲功率源采用Marx发生器技术路线，由10级电容和开关组成，单级电容为100 nF/100 kV电容，开关采用环形轨道气体火花间隙开关，通过紧凑型结构设计，降低系统回路电感，采用电阻作为级间放电的隔离元件，整个Marx发生器系统放置于变压器绝缘油中，以实现高压绝缘。Marx发生器系统充电电压为50 kV，总储能5 kJ，在12 的水负载上可以获得600 kV，50 kA的脉冲输出，脉冲上升时间小于100 ns。系统尺寸为1.2 m0.5 m0.6 m。基于该低阻抗脉冲功率系统，直接驱动低阻抗磁绝缘线振荡器。在二极管电压约450 kV，电流约40 kA 条件下，测得辐射微波功率约400 MW，微波脉宽约 60 ns，微波频率1.23 GHz，辐射微波模式为TM01模。Abstract: A 10-staged low impedance Marx generator is designed, the volume of the generator is about 0.5 m3 and the output power and pulse width are more than 30 GW and 200 ns. The compact pulsed power system contains 10 bipolar (50 kV) stages of capacitors and rail switches placed in a tank filled with dielectric oil. The positive and negative electrodes of the capacitor are suppressed within the switchs electrode. This system stores 5 kJ and is capable of delivering a current up to 41.6 kA at 500 kV to a 12 load. The rise time of the current is less than 100 ns. The system size is 1.2 m0.5 m0.6 m. In this paper, the experimental results with resistive load are presented as well as data obtained when the obtained Marx generator is coupled to high power microwave tubes. A microwave output power of about 400 MW is got at 1.23 GHz. The radiation mode is TM01, and pulse width is 60 ns.
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