Mainz 2022 – scientific programme

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P: Fachverband Plasmaphysik

P 7: Atmospheric Pressure Plasmas I

P 7.3: Talk

Tuesday, March 29, 2022, 14:30–14:45, P-H11

Investigations on the impact of electrode proximity on streamer breakdown and development of pulsed dielectric barrier discharges — •Hans Höft, Jente R. Wubs, Manfred Kettlitz, Markus M. Becker, and Klaus-Dieter Weltmann — Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Straße 2, 17489 Greifswald, Germany

The impact of the electrode proximity on the streamer breakdown and development of pulsed-driven dielectric barrier discharges (DBDs) in a single-filament arrangement was investigated in a gas mixture of 0.1 vol% O₂ in N₂ at 0.6 bar and 1.0 bar. To this end, the gap distance was varied from 0.5 mm to 1.5 mm, while the applied voltage was adapted correspondingly to create comparable breakdown conditions in the gap. The development of the DBDs was recorded by an iCCD and a streak camera system, which enabled sub-ns temporal and µm spatial resolution. Simultaneously, fast electrical measurements provided insight into relevant discharge characteristics such as the transferred charge and consumed energy. The results demonstrate that breakdown in a smaller gap is characterised by a slower streamer propagation but a significantly higher acceleration. It can therefore be concluded that the proximity of the cathode has a strong impact on the characteristics of the streamer breakdown. However, after the streamer has crossed the gap, the discharge structure in front of the anode was found to be the same independent of the actual gap distance.

This work was funded by the DFG in the framework of the MultiFil project (project number 408777255).