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Communication Dans Un Congrès Année : 2021

Ionization Mechanism in a Thermal Spark Discharge

Résumé

The formation of thermal sparks generated by nanosecond pulses is studied experimentally and numerically. The increase of the electron number density, up to 10 19 cm-3 , is measured with sub-nanosecond resolution using Stark broadening of N + , Stark broadening of Hα, continuum emission of the electron, and the intensity of N + lines. Our experimental results are then compared to 0-D kinetic simulations including the electron-impact ionization of excited electronic states of N and O. The electron temperature, in equilibrium with the gas temperature, reaches 42,000K, which agrees with our experimental findings and the literature on the thermal spark.
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Dates et versions

hal-03103724 , version 1 (28-01-2021)

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Nicolas Minesi, Pierre Mariotto, Gabi-Daniel Stancu, Christophe O Laux. Ionization Mechanism in a Thermal Spark Discharge. AIAA Scitech 2021 Forum, Jan 2021, VIRTUAL EVENT, France. ⟨10.2514/6.2021-1698⟩. ⟨hal-03103724⟩
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