Berlin 2001 – wissenschaftliches Programm
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P: Plasmaphysik
P 10: Theory and Plasma Diagnostic (Poster Session)
P 10.19: Poster
Mittwoch, 4. April 2001, 12:30–15:00, AT2
Application Of Saturated LIF During The Prebreakdown Phases Of Pseudospark Discharge — •Vladimir Arsov1, Klaus Frank1, and Dieter H.H. Hoffmann2 — 1Physics Department - I, University of Erlangen-Nuernberg, Erwin-Rommel Str. 1, D-91054 Erlangen — 2GSI - Plasmaphysics, Planckstr. 1, D-64291 Darmstadt
Saturated laser induced fluorescence (LIF) is applied for measurement of the ground state metal vapour sputtered during the prebreakdown phases of pseudospark discharge. Measurements are made in a pseudospark switch (PSS) with copper cathode and hydrogen, helium, neon and argon as buffer gases. The results agree with the simulation of [1] and confirm, that the number density of the sputtered cathode particles is insufficient to invoke a field enhanced thermionic emission [2], which was supposed to be responsible for the super emissive glow, observed during the high current phase. The particle density is obtained by using the maximum and the integral of the LIF signal. There is a good agreement between the two methods of calculation. Absolute calibration is obtain by Rayleigh scattering on SF6.
[1] Anders A., Anders S. and Gundersen M.A., Model for explosive electron emission in a pseudospark "superdense glow", Phys. Rew., Lett., vol. 71, Nr. 3, pp. 364-7, 1993;
[2] Hartmann W., Dominic V., Kirkman G.F. and Gundersen M.A., An analysis of the anomalous high-current cathode emission in pseudospark and back-of-the-cathode lighted thyratron switches, J. Appl. Phys., vol. 65, Nr.11, 1989;