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Electric field characterization of atmospheric pressure Helium plasma jets through numerical simulations and comparisons with experiments

Abstract : In this PhD thesis numerical simulations based on a 2D fluid model are used to characterize pulsed Helium plasma jets. The model for He plasma jets is developed to describe He jets flowing in N2 and O2 atmospheres and interacting with targets. The discharge dynamics in He jets impacting a grounded metallic target is analyzed with both positive and negative polarities of applied voltage. The temporal and spatial evolutions of electric field associated to the first and rebound ionization fronts are in good qualitative agreement with recent electric field measurements. Then, the plasma-target interaction occurring between a positive discharge and a BSO dielectric target is investigated in detail and results are directly compared with experiments. A good agreement is obtained between simulations and experiments concerning the temporal and spatial profiles of electric field. Maximum values of electric field inside the target of 5 kV.cm−1 are found. The high electric field in the plasma of the order of dozens of kV.cm−1 is severely depleted by the change of permittivity. As a result, the electric field experienced inside the target is almost exclusively originated by the high values of surface charge deposited on the target surface. Finally, the influence of the electric field evolutions on the production of chemically active species close to the targets is evaluated. It is shown that with metallic targets the synergy between the first and rebound fronts increases species production close to the target.
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  • HAL Id : tel-01982479, version 1

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Pedro Arsénio Nunes Aleixo Viegas. Electric field characterization of atmospheric pressure Helium plasma jets through numerical simulations and comparisons with experiments. Plasma Physics [physics.plasm-ph]. Université Paris Saclay (COmUE), 2018. English. ⟨NNT : 2018SACLX061⟩. ⟨tel-01982479⟩

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