抄録
The switching time and arc-ignition probability of a sustained main discharge in laser trigger vacuum gap were measured. The third harmonic beam of Nd:YAG pulse laser(wavelength 355 nm, energy 5mJ/pulse, power density 4×107 W/cm2) was used to trigger the gap. The main electrodes of 85mm diameter were made of oxygen-free copper. The gap length was 1.6mm and the experimental chamber was evacuated to about 1.3×10-4 Pa by a turbo-molecular pump. The UV beam from the laser was focused at normal incidence onto the grounded cathode.
The switching time decreased with increasing of the applied voltage.And arc ignition probability increased with increasing of the applied voltage. The switching time was 326ns at 15kV with the circuit inductance 107μH. Its jitter was 24.8 ns. The advantageous results obtained with UV beam are compared to the previously reported data in the triggered vacuum gap.
