摘要:
为了减小脉冲功率源装置的体积,对三电极气体开关和两电极气体开关的结构进行了小型化设计。采用电磁场仿真软件对局部结构进行优化,对初步设计的触发开关和自击穿开关在不同 SF6气压(0~0.2 MPa)、不同开关间隙条件下的击穿电压及触发工作电压等进行了实验研究。结果表明:设计的触发开关和自击穿开关在0~0.2 MPa 气压范围内,自击穿电压随气压具有很好的线性关系;自击穿开关间隙为8 mm,改变气压(0.1~0.2 MPa)可实现自击穿电压90~125 kV 可调;触发开关主间隙为7 mm,改变气压(0.1~0.2 MPa)可实现触发工作电压40~95 kV 可调;初步估算,触发开关和自击穿开关的工作电感均约20 nH。利用重频脉冲电源,测试了开关的重频工作能力,在工作电压80 kV、导通电流约20 kA 的条件下,重复工作频率在20 Hz 以上。此外,利用研制的开关构建了八级紧凑型 Marx 发生器,实现了5和10 Hz 重频多脉冲输出。
Abstract:
The tri-electrode gas switch and two-electrode rail-gap switch were designed.Experiments for breakdown-voltage and repetitive operation of these switches were done in different gas pressure and gap conditions.The results show the relation be-tween breakdown-voltage and gas pressure is linear.Breakdown-voltage of two-electrode rail-gap switch with 8 mm gap can be ad-justed from 90 to 125 kV at gas pressure 0.1 to 0.2 MPa.Operating voltage of trigger switch with 7 mm gap can be adjusted from 40 to 95 kV.Repetitive operation rate of these switches was up to 20 Hz with 20 kA current.Based on these switches,an 8-stage compact Marx generator was setup.Multi-pulse output with 5 or 10 Hz repetitive rate was gained in experiments.The output peak power was about 7 GW for 5 Hz,and 3.5 GW for 10 Hz with pulse width (FWHM)of 1 50 ns.