Investigation of coaxial-triplate water dielectric output switch

A 4 MV coax-to-triplate multi-channel water dielectric self-breaking switch is designed for the oil and water section of a pulse power machine. The machine contains 24 modules with identical components. Eeach module contains Marx generator, intermediate store capacitor, laser triggered gas switch, water pulse forming line, water selfbreaking switch, transmission line and water resistance load. The water switch consists of three linear arrayed selfbreaking gaps, a prepulse shield(PPS) and supporting hardware. An experiment is conducted to investigate the switch with or without PPS. Each gap of the switch with PPS is made up of two hemispherical electrodes,80 mm and 50 mm for input and output elatrodes respectively，and each gap of the switch without PPS is plane to pin electrode（30 mm?