Simulating Dynamic Triggering Events in Field Distortion Spark Gap Switches

Low inductance closing switches are a critical component of linear transformer drivers (LTD) and other pulsed power systems. While these devices are vital to controlling the timescale of triggering events, present designs have shown limitations due to their lack of specification toward LTDs. These limitations include high inductance and excessive erosion of the switch electrodes. To reduce the overall inductance and minimize maintenance on the High Amperage Driver for Extreme States (HADES), we have designed a single channel field distortion ball switch that addresses these disadvantages. COMSOL studies (2-D) of dynamic DC and pulsed triggering events at +/- 100 kV are used to investigate potential current paths and rise times inside of the switch cavity. Our COMSOL studies will inform changes to our design before testing our switches in a multi-brick system.