Study of a positive corona discharge in argon at different
pressures |
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Authors: | R Benocci M Urbano L Mauri |
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Institution: | (1) Dipartimento di Fisica “G. Occhialini”, Università degli Studi di Milano-Bicocca, P.zza della Scienza 3, 20126 Milano, Italy;(2) SAES Getters S.p.A., Viale Italia 77, 20020 Lainate, Milano, Italy |
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Abstract: | The corona discharge in argon at atmospheric pressure has been studied by
means of a 2D model. The reduced characteristic derived from the
experimental data has been described by linear regressions for the different
pressures and the two studied inter-electrode distances thus confirming the
validity of Townsend's approximation also in case of point to plane
configuration and argon as process gas. The model validated this hypothesis
which has been attributed to the minor influence of space charge in the
ionization zone. Its effect is, on the other hand, more significant in the
drift zone where the electric field is greatly enhanced, leading, for higher
currents, to the formation of a spark gap. Electron and ion distributions
allow the influence of structural (electrode configurations and distance)
and operative (pressure and discharge current) parameters to be evaluated
including the current loss due to diffusion through different confining
boundaries. |
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Keywords: | |
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