Pulsed Power Plasma Devices Based on Hollow and Super-Emissive Cathodes.
Final rept. 1 May 92-31 Jul 93,
UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING AND ELECTROPHYSICS
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The understanding of emission and transport in the pseudospark is complex because these are related to a transition between two fundamentally different modes of electron emission. During the previous year we have conducted probe measurements of plasma parameters. We found that fluctuations related to a glow to arc transition can occur wherein smooth current growth is interrupted by cathode spot formation resulting in very rapid rise in current. These results support a view that quenching observed in the pseudospark is a double layer phenomenon that occurs when emission cannot exceed secondary emission produced by ion bombardment. These results are new in that they provide a new explanation of quenching, and demonstrate a valuable probe method.
- Electrical and Electronic Equipment
- Plasma Physics and Magnetohydrodynamics