Rotary trigger double spark gap switch for repetitive pulse generator and production of silver nanocolloid.

High-voltage, repetitive pulse generation technology plays a key role in underwater discharge applications such as water treatment and metal nanocolloid production. For these applications, a high-voltage, high-speed switching technology was crucial to swiftly transfer the energy stored in the capacitor to the electrodes in water. A rotary-triggered double spark gap switch was developed for this purpose in this study. Two spark gaps dedicated for charge and discharge were arranged in this switch, and they eliminated the irregular and unstable pulse generation due to the simultaneous charging and discharging in the pulse-generating circuits. Using this technique, pulses with 12 kV and 100 ns rise time were generated at a repetition rate of 150 pulses per second and applied to underwater discharge to produce silver nanocolloids.