Hannover 2020 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 10: Poster Session 2
P 10.23: Poster
Dienstag, 10. März 2020, 16:30–18:30, Empore Lichthof
Influence of secondary electron emission and dielectric permittivity on argon dielectric barrier discharges — •Marjan Stankov, Markus M. Becker, Robert Bansemer, and Detlef Loffhagen — Leibniz Institute for Plasma Science and Technology (INP), 17489 Greifswald, Germany
In this contribution the behavior of dielectric barrier discharges (DBD) in argon at subatmospheric pressure with the variation of the secondary electron emission coefficient (γ) and dielectric permittivity (εr) of the dielectric layers is studied by means of fluid modeling. The investigated plasma source has a symmetric plane-parallel geometry with the electrodes covered by quartz dielectrics and a gap width of 3 mm. A time-dependent, spatially one-dimension fluid model comprising balance equations for particle number densities and the electron energy density coupled with Poisson’s equation was employed for modeling of the DBD. Model calculations were carried out for different values of γ and εr of dielectric layers at pressures from 100 to 650 mbar. Very good agreement between modeling results and measured data for the discharge current and dissipated power was obtained over the complete pressure range. It was found that the increase of γ and εr leads to an earlier occurrence of gas breakdown and decreasing of the breakdown voltage. The analysis of the average dissipated power reveals that the variation of εr has a stronger influence on the modeling results in comparison with γ variation, especially at higher pressures.
Funded by the Deutsche Forschungsgemeinschaft (DFG) - project number 368502453.