Measurement of cathode-spot parameters with pulsed-laser diagnostics

Nadja Vogel; Jan Heinzinger; Frank Cichos

doi:10.1117/12.174643

1 May 1994 Measurement of cathode-spot parameters with pulsed-laser diagnostics

Nadja Vogel, Jan Heinzinger, Frank Cichos

Proceedings Volume 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum; (1994) https://doi.org/10.1117/12.174643
Event: XVI International Symposium on Discharges and Electrical Insulation in Vacuum, 1994, Moscow-St. Petersburg, Russian Federation

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.

Citation Download Citation

Nadja Vogel, Jan Heinzinger, and Frank Cichos "Measurement of cathode-spot parameters with pulsed-laser diagnostics", Proc. SPIE 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum, (1 May 1994); https://doi.org/10.1117/12.174643

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