Analysis of the Cathode Spot of Metal Vapor Arcs
- 1 January 1983
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Plasma Science
- Vol. 11 (3), 103-110
- https://doi.org/10.1109/tps.1983.4316235
Abstract
This paper presents an analysis on the statics and dynamics of a current carrying plasma channel under the influence of an applied magnetic field and under very general flow conditions. Based on this analysis a stability criterion for a discharge channel which emanates from a crater of a low-pressure arc cathode attachment wil be derived. As a consequence of this stability theory one may explain arc spot motion by a kink instability of the discharge channel causing the channel to bend more and more and eventually contacting the cathode surface at a nearby site thereby creating a new emitting spot. By means of this criterion, the dissipation mechanisms during a spot lifetime are determined for pure copper and molybdenum cathodes under the assumption of least possible voltage requirement.Keywords
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