Erlangen 2026 – scientific programme

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P: Fachverband Plasmaphysik

P 12: Atmospheric Pressure Plasmas I

P 12.4: Talk

Wednesday, March 18, 2026, 14:45–15:00, KH 01.020

Pressure-dependent streamer dynamics of a nanosecond-pulsed surface dielectric barrier discharge in He/N₂ — •Nils Schoeneweihs, Dominik Filla, Gerrit Hübner, Thomas Mussenbrock, Mate Vass, and Ihor Korolov — Ruhr University Bochum, Bochum, Germany

Surface dielectric barrier discharges (sDBDs) have been extensively studied for applications ranging from plasma-assisted gas conversion to surface treatment. In this work, sDBDs driven by nanosecond voltage pulses are investigated in He/N₂ gas mixtures and at various pressures. 2D plasma*fluid simulations (nonPDPSIM) and experiments are conducted to investigate streamer formation, propagation length and velocity and their implications for plasma-assisted conversion. Insights into the discharge dynamics are obtained by measuring emission from the He-I (3s)³S₁ state (with an excitation energy of 22.7 eV) and by calculating the corresponding spatio-temporal excitation rate using phase-resolved optical emission spectroscopy (PROES). Good qualitative agreement is found between PROES measurements and simulations. The results suggest strong coupling between the positive streamer at the powered electrode and the negative streamer at the grounded electrode in a twin-sDBD configuration. Varying the pressure strongly influences the velocity and propagation length of the streamer. Supported by the DFG via SFB 1316 (Projects A5 and A7).

Keywords: Low temperature plasmas; Atmospheric pressure plasmas