542 / 2022-03-29 15:42:11

Research on time delay characteristics of three-gap laser-triggered vacuum switch

Laser-triggered vacuum switch,multi-gap in series,curling stainless steel electrodes,trigger delay time

Abstract:  High-voltage laser-triggered vacuum switches have good application prospects in pulsed power systems. In this paper, a multi-gap laser-triggered vacuum switch is proposed, which consists of a laser-triggered gap and two symmetrical curling stainless steel electrodes in series. Based on the detachable vacuum chamber, a laser-triggered multi-gap vacuum switch test platform was built, and the time delay characteristics of the multi-gap switch were experimentally studied under the conditions of different laser energies, different operating voltages, and different voltage split ratios. The experimental results show that the trigger delay time of the multi-gap switch is not only related to the external working conditions, but also affected by the working parameters between the three gaps. With the increase of laser energy and operating voltage, the trigger delay and jitter time of the switch decrease accordingly. By matching with appropriate working parameters, better time delay characteristics can be obtained. When the laser energy is 30 mJ and the operating voltage is 30 kV, the trigger delay time of the three-gap laser-triggered vacuum switch with a voltage split ratio of 8:3:1 is as low as 170 ns.