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Model of a Hollow Cathode Insert Plasma

Show simple item record Mikellides, Ioannis G. Katz, Ira Goebel, Dan M. Polk, James E. 2006-11-28T18:53:10Z 2006-11-28T18:53:10Z 2004-07-12
dc.identifier.citation 2004 Joint Propulsion Conference, Fort Lauderdale, Florida, July 12-14, 2006. en
dc.identifier.clearanceno 04-2113
dc.description.abstract A 2-D axisymmetric fluid model of the plasma in the insert region of a hollow cathode is presented. The level of sophistication included in the model is motivated in part by the need to etermine quantitatively plasma fluxes to the emitter surface. The ultimate goal is to assess whether plasma effects can degrade the life of impregnated inserts beyond those documented throughout the 30-50 year history of vacuum cathode technologies. Results from simulations of a 1.2-cm diameter cathode operating at a discharge current of 25 A, and a gas flow rate of 5 sccm, suggest that approximately 10 A of electron current, and 3.5 A of ion current return to the emitter surface. The total emitted electron current computed by the model is about 35 A. Comparisons with plasma measurements suggest that anomalous heating of the plasma due to two-stream instabilities is possible near the orifice region. Solution to the heavy species energy equation, with classical transport and no viscous effects, predicts heavy species temperatures as high as 2640 °K. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 4152173 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004. en
dc.subject ion propulsion en
dc.subject hollow cathodes en
dc.subject plasma generation en
dc.title Model of a Hollow Cathode Insert Plasma en
dc.type Preprint en

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