Low-inductance 100 kV switch (spark gap) for starting, diverting and clamping capacitor discharges

The development of an accurately triggered, pressurised spark gap of the field-distortion type operating in the cascade mode up to 100kV is described. The effects of variations in the air pressure and in the magnitude and polarity of the charging and trigger voltages have been determined. Designed initially as a switch for starting a high-frequency capacitor discharge (250kc/s), it has also been adapted for diverting and clamping such discharges at currents up to 200kA, passing up to 20C per discharge.