Trigger system of laser triggered gas switch on Qiangguang-Ⅰ accelerator

The paper introduces the design and application of a trigger system for the 2 MV laser triggered gas switch(LTGS)， which was designed as the main switch for Qiangguang-Ⅰ accelerator. In this system， a 266 nm Nd：YAG laser was used， and a beam with a pulse energy of 80mJ， a pulse width of 7 ns and a divergence angle of 0.5 mrad was achieved when the laser was triggered. The two original trigger signals of this trigger system were generated from the trigger system of Qiangguang-Ⅰ， and they were delayed by two DG535 generators， respectively. A laser beam was focused in the LTGS through the crossover tube at 200 ns before the maximum of the self-breakdown voltage. Inexperiments， the trigger system worked well when SF6 was filled in switch and the gas pressure was 0.2 to 0.3 MPa， and the trigger jitter was 3.86 ns at the gas pressure of 0.3 MPa.