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Proceedings Paper

Measurement of cathode-spot parameters with pulsed-laser diagnostics
Author(s): Nadja Vogel; Jan Heinzinger; Frank Cichos
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Paper Abstract

The cathode spot formation within first 22 ns was investigated by laser absorption photography and ps-pulse interferometry. The discharge was initiated between W-, Ag-, AuNi-, Pd- electrodes with cathode-anode distance below 100 micrometers , the arc duration was some milliseconds and arc current 5 A. A ps-pulse holographic interferometer and momentary absorption photography enabled us to determinate spatial-temporal density distributions in the ignition phase of the cathode spot. An absolute electron density value of order of 3 - 1026 m-3 has been determined indicating high conductivity values of the metal vapor plasma. Present measurements show that cathode spot plasma is essentially non- ideal and verify theoretical calculations resulting in an ionization potential decrease in dense cathode plasmas.

Paper Details

Date Published: 1 May 1994
PDF: 4 pages
Proc. SPIE 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum, (1 May 1994); doi: 10.1117/12.174643
Show Author Affiliations
Nadja Vogel, Univ. of Technology Chemnitz-Zwickau (Germany)
Jan Heinzinger, Univ. of Technology Chemnitz-Zwickau (Germany)
Frank Cichos, Univ. of Technology Chemnitz-Zwickau (Germany)


Published in SPIE Proceedings Vol. 2259:
XVI International Symposium on Discharges and Electrical Insulation in Vacuum
Gennady A. Mesyats, Editor(s)

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