München 2019 – scientific programme

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.33: Poster

Thursday, March 21, 2019, 16:30–18:30, Foyer Audimax

How the description of electron transport affects the results of microplasma modelling — •Margarita Baeva, Detlef Loffhagen, Markus M. Becker, and Dirk Uhrlandt — Leibniz Institute for Plasma Science and Technology, 17489 Greifswald, Germany

This contribution is concerned with the impact of the description of the transport parameters for electrons and their energy (mobility and diffusivity) in the framework of numerical modelling of dc microdischarges in atmopsheric pressure argon. Three modelling approaches are considered in relationship to the drift-diffusion approximation (DDA): 1) the common DDA and a Maxwellian electron velocity distribution function (EVDF); 2) the common DDA combined with EVDF as a solution of the Boltzmann equation providing the rate coefficients and electron mobility and diffusivity, and a simplified transport of electron energy; 3) an improved DDA. These three approaches are implemented in a spatially one-dimensional model. A comparison of various plasma parameters is given for a wide range of discharge currents in a parallel-plate arrangement with an inter-electrode gap of 0.4 mm. The behaviour of the plasma parameters corresponding to various discharge regimes (glow, arc and the transition region) and the model’s capability of a unified description of microarcs are discussed.
Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - project number 390828847.