The effects of normal current density and the plasma spatial structuring in argon DBDs |
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Authors: | I A Shkurenkov Y A Mankelevich T V Rakhimova |
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Institution: | 1.Skobeltsyn Institute of Nuclear Physics, Lomonosov’s Moscow State University,Moscow,Russia |
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Abstract: | This paper presents the results of theoretical studies of high-pressure dielectric barrier discharges (DBD) in argon. Two
different DBDs at the megahertz and the kilohertz power frequency range were simulated. The effect of normal current density
was obtained in the numerical model for both types of the discharge. The discharge of megahertz range was uniform over the
radius. The increase in the discharge current is accompanied by increase in the discharge area. The discharge of kilohertz
range is not uniform over the radius. The concentric ring formation was observed during calculations. The increase in the
discharge current occurs due to increase in the number of rings and as a result in the discharge area. The developed 2D model
is able to describe only the first stage of the filament formation – the formation of concentric plasma rings. The filament
formation starts at the edge of the current channel and spreads to its centre. Both the effect of normal current density and
the filaments formation are caused by the nonstationarity at the current channel boundary. |
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