Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 21: Atmospheric Plasmas and their Applications V

P 21.4: Hauptvortrag

Donnerstag, 3. April 2025, 14:45–15:15, ZHG006

Hybrid fluid/MC simulations of radio-frequency atmospheric pressure plasma jets — •Mate Vass^1,2, Peter Hartmann², Zoltan Donko², Ihor Korolov¹, Thomas Mussenbrock¹, and Julian Schulze¹ — ¹Chair of Applied Electrodynamics and Plasma Technology, Ruhr-University Bochum, 44780 Bochum, Germany — ²Institute for Solid State Physics and Optics, HUN-REN Wigner Research Centre for Physics, 1121 Budapest, Hungary

Radio-frequency (RF) driven atmospheric pressure micro plasma jets have a wide range of industrially relevant applications. In order to optimize them, a quantitative understanding of how the neutral species densities build up along the jet channel is needed. This is a result of the complex interplay between multiple processes on different timescales. While fluid simulations are usually employed for the description of these jets, they are unable to account for kinetic effects in case of the electrons, which however directly influences the plasma chemistry. Fully kinetic simulation methods, such as PIC/MCC, are, on the other hand, too impractical at atmospheric pressure, particularly for the complex gas mixtures relevant to applications. In this talk, a hybrid simulation method is presented, leveraging the time scale separation of physical processes and the kinetic description of electrons. The method combines a fluid model for charged and neutral species and a Monte Carlo module for electrons only. This approach achieves significant speedup compared to fully kinetic simulations while maintaining accuracy. Simulations of a He/O₂ mixture are presented, showing excellent agreement with experimental results.

Keywords: COST-jet; kinetic simulations; hybrid simulations; EEPF control