NDLI: Spectroscopic investigations in the dense discharge plasma of pseudospark switches

Content Provider	IEEE Xplore Digital Library
Author	Urban, J. Arsov, V. Bickes, C. Frank, K. Iberler, M. Prucker, U. Schwab, J. Weisser, W.
Copyright Year	1998
Description	Author affiliation: Phys. Inst., Erlangen-Nurnberg Univ., Germany (Urban, J.)
Abstract	The pseudospark discharge can be subdivided in up to five different phases. In chronological order the first two phases, the low current predischarge and the hollow cathode phase, are well understood. In the following borehole phase the responsible mechanism of electron emission from the cathode material is controversially discussed in the literature. Due to the presented measurements the secondary electron emission caused by impact of discharge gas ions seems to be the favourite candidate. The cathode material seems to be important to start the next discharge phase, the high current phase with the appearance of macroscopic cathode spots. Also higher ionised states of cathode material appear. The last phase in the pseudospark phase, the metal vapour arc, can be compared with typical metal vapour arcs in a vacuum. This arc appears only at very high currents with more than 20 kA and is responsible for the extreme electrode erosion. This strong increase of the erosion at high currents mainly limits the lifetime of the switch. The use of new electrode materials like SiC could reduce this erosion and increase the lifetime. In laser spectroscopic measurements like tomographic two wavelength interferometry a diffuse discharge can be observed with the use of SiC as electrode material, in opposition to a constricted discharge as typical for metal electrodes.
Starting Page	217
Ending Page	220
File Size	484348
Page Count	4
File Format	PDF
ISBN	0780342445
ISSN	10768467
DOI	10.1109/MODSYM.1998.741231
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-06-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectroscopy Plasma density Cathodes Electrodes Electron emission Switches Optical materials Silicon carbide Plasma materials processing Vacuum arcs
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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