SMuK 2023 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 7: Atmospheric Pressure Plasmas and their Applications III

P 7.1: Vortrag

Dienstag, 21. März 2023, 17:00–17:15, CHE/0089

Operation modes of the COST plasma jet — •Maximilian Klich, David Schulenberg, Máté Vass, Katharina Nösges, Sebastian Wilczek, and Ralf P Brinkmann — Ruhr University Bochum, 44780 Bochum, Germany

Discharges ignited at ambient pressure drive complex chemistry. This chemical variety offers plenty of applications; for example, wound healing. A commonly used plasma source at atmospheric pressures is the COST plasma jet, a capacitively coupled radio-frequency driven plasma jet. The main goal of this study is to demonstrate three distinct operation regimes of the COST jet and to indicate their relation. The work is conducted by applying a hybrid particle-in-cell/Monte Carlo collisions (PIC/MCC) simulation code between the jet's electrodes (i.e., a one-dim. setup) for He/N2 chemistry. The framework treats electrons kinetically via PIC/MCC and solves the continuity equation based on the drift-diffusion approximation for all ion species. We vary basic input parameters (e.g., the driving frequency or voltage) to control the discharge regimes. It shows that the scaling of the Debye length, the average sheath width, and the discharge length are comparable in magnitude. Depending on their exact values, the discharge enters one of three modes: (i) A quasi-neutral regime where distinguishable bulk and sheath areas exist. (ii) A non-neutral regime where no quasi-neutral bulk region is developed. (iii) All dynamics are constricted to tiny sheath regions shielding a vast, steady bulk region in the constricted mode. Overall, this work offers parameters for distinct operation modes that allow tailoring the discharge.