Design for Megavolt Inverse-Pinch Plasma Switch
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER
Pagination or Media Count:
To meet the requirements for the output switch of an ultra-high-power 30 GW pulser, an upgrading design for an inverse-pinch plasma switch INPIS is considered. The hold-off voltage of 1 MV is met by adopting multistage rim-fire electrodes and using SF6 as the dielectric gas of the switch. The inductance and capacitance of the switch, which are restricted by the short rise-time 0.1 microsecond requirement, were met by adjusting the dimensions of the coaxial electodes of the switch. The inputoutput transmission lines attached to the switch will be immersed in oil to meet the high voltage insulation and impedence-matching requirements. Since the forwarding current is relatively low with respect to the switch capability, the lifetime of the switch is expected to exceed the requirement of 10000 shots. The choice of the insulator and electrode materials is also discussed. Fabrication of the switch can be accomplished by well-established shop practices, and no special methods are required for its construction.
- Electrical and Electronic Equipment