Ion acceleration in the radially expanding plasma of the hot refractory anode vacuum arc

I. I. Beilis, R. L. Boxman, S. Goldsmith, V. L. Paperny

Research output: Contribution to journalArticlepeer-review

Abstract

The ion energy and plasma potential as a function of radial distance were measured in a vacuum arc mode - the hot refractory anode vacuum arc. A 175 A arc was sustained between a 30-mm-diam water-cooled Cu cathode and a thermally isolated graphite anode. The plasma potential and electron temperature were determined using a triple probe, and the ion energy distribution was measured with a retarding field analyzer. It was found that the electron temperature decreased from 1.2 to 0.6 eV with increasing radial distance from 3 to 18 cm. In the same distance range, the directed ion energy per unit charge increased from 8 to 20 eV. The 12 eV ion energy enhancement significantly exceeded the measured drop of the plasma potential of about 2 V, indicating that the ions were not accelerated electrostatically.

Original languageEnglish
Pages (from-to)2734-2736
Number of pages3
JournalApplied Physics Letters
Volume75
Issue number18
DOIs
StatePublished - 1 Nov 1999

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