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Momentum interchange between cathode-spot plasma jets and background gases and vapors and its implications on vacuum-arc anode-spot development

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2 Author(s)
R. L. Boxman ; Tel Aviv Univ., Israel ; S. Goldsmith

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 gas background produce a hemispherical metal-vapor plasma region whose radius can 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

Published in:

IEEE Transactions on Plasma Science  (Volume:18 ,  Issue: 2 )