激光触发变压器型脉冲调制器的实验研究

Experimental investigation of a laser triggered transformer type pulse generator

本文设计了一台激光触发变压器型脉冲调制器并开展了单次及1Hz重频实验研究。该调制器由水介质同轴脉冲形成线、激光触发开关、脉冲变压器、假负载等组成。在调制器主开关导通电压为-795k V时,激光到达开关25ns后调制器主开关导通,在负载上得到了电压-402k V、电流26k A、脉冲宽度128ns的准方波高功率电脉冲。当调制器主开关分别为氮气、六氟化硫时对调制器激光触发气体开关的延时、抖动特性进行了实验研究,266nm激光触发时,氮气具有较小的延时和抖动;同时对自击穿和激光触发两种情况下负载电压的前沿特性进行了对比,最后对实验结果进行了分析。

A laser triggered transformer type high voltage pulse accelerator is built and experimentally investigated.The pulse accelerator consists of a water dielectric coaxial pulse forming line（ PFL）,a laser triggered gas switch（ LTGS）,a pulse transformer,capacitors and a dummy load. When the pulse accelerator is charged to the voltage of -795 kV,the LTGS is triggered by the laser,then a quasi-square electrical pulse with voltage- 402 k V,current 26 k A and pulse width 128 ns is obtained at the load. The delay time from the laser pulse to the load electrical pulse is 25 ns. Gas switch filled with N_2 has smaller delay and jitter time compared with switch filled with SF_6. Jitter time of the pulse is less than 1ns,when the accelerator is operated in the repetitive mode. Rise times of the output pulses voltage are also analyzed when the switch is self breakdown or laser triggered.