Momentum Interchange Between Cathode-Spot Plasma Jets and Background Gases and Vapors and its Implications on Vacuum-Arc Anode-Spot Development

Raymond L. Boxman, S. Goldsmith

Research output: Contribution to journalArticlepeer-review

Abstract

Expressions are developed for the momentum flux density in collimated and expanding cathode-spot plasma jets by multiplying the ion flux density by the momentum carried by individual ions. Cathode spots placed in a gas background produce a hemispherical metal-vapor plasma region whose radius may be predicted by equating the plasma-jet momentum flux density with the background gas pressure. In hot anode vacuum arcs and in anode-spot vacuum arcs a vapor plume from the anode expands into the cathodic plasma. Significant expansion occurs when the anodic vapor pressure becomes comparable to the cathodic momentum flux density.

Original languageEnglish
Pages (from-to)231-236
Number of pages6
JournalIEEE Transactions on Plasma Science
Volume18
Issue number2
DOIs
StatePublished - Apr 1990

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