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Communication Dans Un Congrès Année : 2020

Role of the excited electronic states in the ionization of ambient air by a nanosecond discharge

Résumé

In this paper, the mechanism of air ionization by a single nanosecond discharge under atmospheric conditions is studied by numerical simulations. The plasma kinetics is solved with ZDPlasKin and the electron energy distribution function is calculated with BOLSIG+. The originality of the model is to consider not only the excited electronic states of N2, but also the excited electronic states of O and N. These states are shown to have a primary importance in the ionization of the plasma for ne > 10 17 cm-3. It is shown that a non-equilibrium plasma (Te > Tgas) at ne = 10 17 cm-3 can reach full ionization and thermalization (Te = Tgas ≈ 3 eV, ne ≈ 10 19 cm-3) in less than half a nanosecond under a field usually encountered in nanosecond discharges.
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Dates et versions

hal-02431589 , version 1 (08-01-2020)

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Nicolas Minesi, Pierre Mariotto, Gabi D. Stancu, Christophe O Laux. Role of the excited electronic states in the ionization of ambient air by a nanosecond discharge. AIAA Scitech 2020 Forum, Jan 2020, Orlando, United States. ⟨10.2514/6.2020-0437⟩. ⟨hal-02431589⟩
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