Accession Number : ADA303960

Title :   Pulsed Power Plasma Devices Based on Hollow and Super-Emissive Cathodes.

Descriptive Note : Final rept. 1 May 92-31 Jul 93,

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING AND ELECTROPHYSICS

Personal Author(s) : Gundersen, Martin

PDF Url : ADA303960

Report Date : OCT 1995

Pagination or Media Count : 13

Abstract : 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.

Descriptors :   *PLASMA DEVICES, *THYRATRONS, PROBES, LAYERS, PLASMAS(PHYSICS), QUENCHING, CATHODES, ELECTRON EMISSION, SECONDARY EMISSION, ELECTRONIC SWITCHES, ION BOMBARDMENT, SPARK GAPS, ELECTRIC DOUBLE LAYER.

Subject Categories : Electrical and Electronic Equipment
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE