Condensed Matter Physics, 2007, vol. 10, No. 2(50), p. 209217, English

Title: Numerical modelling of low-temperature non-equilibrium plasma of pulsing corona and breakdown
  V.I.Chyhin (Lviv Polytechnic National University, 12 BanderaStr., 79013 Lviv, Ukraine) ,
  S.Y.Karpyak (Lviv Polytechnic National University, 12 BanderaStr., 79013 Lviv, Ukraine)

The method of determining an existence region of the non-equilibrium plasma of the pulsating negative corona and breakdown is developed. The low-temperature non-equilibrium pulsing plasma of the point-to-plane negative corona and a transition form to the breakdown in nitrogen-oxygen mixture are numerically simulated. It is shown that plasma parameters are pulsing in time as well as in space. In the phase of corona pulse peak, its position adjoins the cathode surface, no further than 0.01 cm. In the initial phase of breakdown, it extends far beyond the surface, within the distance of 0.03 cm. At the same time, the electron temperature changes in almost full anti-phase to the current: from 9100 K to 19000 K during the corona pulse peak and from 6000 K to 20000 K in initial phases of the breakdown. The average plasma density changes in the range 7x1011-8x1012 cm-3 in the first case and 1x1013-5x1013 cm-3 in the case of breakdown.

Key words: corona discharge, breakdown, non-equilibrium plasma, numerical modelling
PACS: 52.80

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