Analysis of the Dissipation Mechanism within an Instationary Cathode Spot of Metal Vapor Arcs.
Annual report. 1 Aug 83-31 Jul 84,
STUTTGART UNIV (GERMANY F R) INST FUER RAUMFAHRTANTRIEBE
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This paper deals with the dissipation mechanism of microspots on low pressure arc cathodes. Based on a new MPD stability theory and on an experimentally found empirical relation between spot current and crater radius on pure copper and molybdenum cathodes, the time behavior of pressure and temperature within the spot and the appertaining voltage drop have been calculated. Emphasis has been placed on finding an analytical solution for the time dependent heat flux into the hemispherical crater surface as a function of the expansion of the spot.
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