SMuK 2023 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 9: Atmospheric Pressure Plasmas and their Applications III

P 9.7: Vortrag

Mittwoch, 22. März 2023, 12:45–13:00, CHE/0089

Modelling of self-pulsing discharges at atmospheric pressure — •Aleksandar P. Jovanović¹, Hans Höft¹, Detlef Loffhagen¹, Torsten Gerling^{1, 2}, and Markus M. Becker¹ — ¹Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany — ²Competency centre for diabetes KDK Karlsburg, Greifswalder Str. 11, 17495 Karlsburg, Germany

Non-thermal atmospheric-pressure plasmas are of considerable interest due to their wide relevance for technical and medical applications over the past decade. Self-pulsing discharges are a common way to generate these plasmas. Here, the discharge current is limited by a suitably designed electrical circuit to prevent thermalisation. Current oscillations observed in these discharges were attributed to the existence of ion acoustic waves (IAWs) and can be used for plasma diagnostics. Therefore, a detailed understanding of the electron and ion kinetics during the discharge evolution is of great interest. For this purpose, a time-dependent, spatially one-dimensional fluid-Poisson model coupled with an equation of electrical circuit has been applied to study a self-pulsing discharge in argon at atmospheric pressure. The characteristic phases governed by different charge carrier production and loss processes as well as the dominant ions produced during the discharge have been analysed. The two-cathode effect has been identified as a potential excitation mechanism of IAWs at atmospheric pressure.

Funded by the Deutsche Forschungsgemeinschaft (DFG) -- project number 466331904.