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Breakdown probability and influence on breakdown delay

Published online by Cambridge University Press:  15 June 1999

V. Lj. Marković ,
S. R. Gocić  and
M. K. Radović
V. Lj. Marković*
Affiliation:
Department of Physics, University of Niš, P.O. Box 91, 18001 Niš, Yugoslavia
S. R. Gocić
Affiliation:
Department of Physics, University of Niš, P.O. Box 91, 18001 Niš, Yugoslavia
M. K. Radović
Affiliation:
Department of Physics, University of Niš, P.O. Box 91, 18001 Niš, Yugoslavia
*
vmarkovic@ni.ac.yu
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Abstract

A method for determination of probability of electrical breakdown of gases is presented in this paper and results are compared with theory. The method is based on the measurements of breakdown time delay at different afterglow periods (relaxation times), where the secondary electron yield initiating breakdown is caused by residual active states reMayning from the preceding glow. Measurements are carried out at low pd (gas pressure times electrode spacing) of nitrogen and higher overvoltages up to 2.1Us (Us: the static breakdown voltage). The experimentally determined breakdown probability is fitted by theoretical expressions for both the Townsend and streamer model of electrical breakdown, with particular attention to the higher overvoltages. On the basis of our measurements and theoretical fit it can be concluded that the Townsend mechanism is applicable at low pd value over the whole range of overvoltage applied and a value of a secondary emission coefficient for gold-plated copper cathode is obtained. With the decrease of the breakdown probability and electron yield the distributions of delay times become broader and centered at larger delay times, and the positive asymmetry and roundness increase.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 6 , Issue 3 , June 1999 , pp. 303 - 307
Copyright
© EDP Sciences, 1999

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