可调间隙亚纳秒气体开关的优化设计
Optimizing design of sub-nanosecond gas switch with adjustable gap
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摘要: 对用于UWB-1系统的可调间隙亚纳秒气体开关进行了结构优化设计，并采用Ansoft软件分别对开关绝缘子和电极处的静电场进行了模拟。优化后的调节旋钮在实验调试中使用方便，能准确地测量开关间隙的大小。绝缘子结构优化后，局部场强集中点的最大场强降低为126.6 kV·mm-1，低于理论击穿场强，满足了绝缘要求。对优化后的亚纳秒气体开关进行了高压实验，结果表明：绝缘子处没有击穿现象发生，开关工作稳定，输出脉冲的前后沿变快且脉宽变窄。系统重复频率5 Hz运行时，优化后的脉冲前后沿和脉宽分别比优化前减小了130，120和100 ps。系统重复频率100 Hz运行时，优化后的脉宽比优化前减小了150 ps，比重复频率5 Hz运行时只增加了30 ps。Abstract: The structure of the sub-nanosecond gas switch with adjustable gap used on the UWB-1 system are optimized. During commissioning, the optimized rotary knob can adjust the gaps easily and measure gap size accurately. The static electric-field distributions at insulators and electrodes of the switch are simulated. The maximal static electric-field strength at the optimized insulator is 126.6 kV/mm, which is under theory breakdown field strength and satisfies insulation requirement. High voltage experiments are conducted on the switch. The results show that no breakdown happens at the insulators, and the switch can work steadily and output shorter pulses with steeper rise and fall edges. When the system works at 5 Hz repetition rate, rise time, fall time and pulse width of the output pulse dec
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