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Proceedings Paper

Cathode sputtering as a reason for the superemissive glow in pseudospark
Author(s): Vladimir Arsov; Klaus Frank
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Paper Abstract

Ground state copper vapour number density is measured with laser-induced fluorescence (LIF) in an experimental pseudospark switch, which allows optical access in the main gap region. The densities for the four buffer gases-hydrogen, helium, neon and argon-are in the range 6•1016-2•1018 m-3. The sputtering yield for the corresponding buffer gas ion with energy 50 eV is in the interval 0.1-0.7. Estimation of the power density, deposited to the cathode by ion bombardment in typical pseudospark conditions, using the measured number densities of the sputtered particle, as well as those of the buffer gas atoms at 20 Pa, indicates that the cathode heating is below the melting temperature. This fact leads to the conclusion, that the observed superemissive glow in pseudospark is due to an arc-like process with participation of multiple, homogenously distributed cathode spots, rather than a field enhanced thermionic emission, as previously thought.

Paper Details

Date Published: 22 April 2005
PDF: 5 pages
Proc. SPIE 5830, 13th International School on Quantum Electronics: Laser Physics and Applications, (22 April 2005); doi: 10.1117/12.618807
Show Author Affiliations
Vladimir Arsov, Friedrich-Alexander-Univ. Erlangen-Nuernburg (Germany)
Klaus Frank, Friedrich-Alexander-Univ. Erlangen-Nuernburg (Germany)

Published in SPIE Proceedings Vol. 5830:
13th International School on Quantum Electronics: Laser Physics and Applications
Peter A. Atanasov; Sanka V. Gateva; Lachezar A. Avramov; Alexander A. Serafetinides, Editor(s)

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