SMuK 2023 – scientific programme

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P: Fachverband Plasmaphysik

P 7: Atmospheric Pressure Plasmas and their Applications III

P 7.3: Talk

Tuesday, March 21, 2023, 17:30–17:45, CHE/0089

Gas temperature variations along the discharge channel in an atmospheric pressure RF plasma jet and their consequences on electron dynamics — •David A. Schulenberg¹, Maximilian Klich¹, Zoltán Donkó², Máté Vass^1,2, Jeldrik Klotz¹, Nikita Bibinov¹, Julian Schulze¹, and Thomas Mussenbrock¹ — ¹Ruhr University Bochum, German — ²Wigner Research Center for Physics, Budapest, Hungary

The gas temperature increase along the discharge channel of a radio frequency micro-atmospheric pressure plasma jet is investigated by a combination of spectroscopic measurements and particle in cell (PIC) simulations. The jet is operated using Helium-Nitrogen mixtures of He:N2 ratios of 1000:0.5 to 1000:2. We find that under standard operating conditions, the increase in gas temperature depends on the nitrogen content of the jet gas, the driving voltage, and the driving voltage waveform. Depending on the exact combination of these parameters, the gas temperature increases approximately 80 K between the gas inlet and the nozzle of the jet. Phase Resolved Optical Emission Spectroscopy measurements reveal a change of the time- and space-dependent dynamics of the high energy electrons in the plasma under operating conditions at which the gas temperature determined by optical emission spectroscopy also changes. This behavior is reproduced by PIC simulations, in which the gas temperature is an input parameter. The dependence of the operation mode on the gas temperature might offer an additional degree of freedom in terms of controlling the plasma properties in order to match specific application requirements.