Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 10: Atmospheric Pressure Plasmas and their Applications II

P 10.1: Invited Talk

Tuesday, February 27, 2024, 14:00–14:30, WW 1: HS

Filament interaction in dielectric barrier discharges — •Hans Höft¹, Ronny Brandenburg¹, Markus M. Becker¹, and Torsten Gerling^1,2 — ¹Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany — ²Competency centre for diabetes (KDK), Greifswalder Str. 11, 17495 Karlsburg, Germany

The formation and interaction of individual filaments in dielectric barrier discharges (DBDs) are essential for the efficiency and efficacy of DBD reactors. In most DBD arrangements, multiple filaments are formed, since the power input per filament is limited. Therefore, the impact of O₂ concentration and high-voltage operation (pulsed vs. sinusoidal) on the number of filaments per period and their ignition pattern is studied. The spatially 1D multi-filament arrangement had a length of about 10 mm while the gap distance was set to 1.0 mm. The working gas was a binary mixture ranging from 0.1 to 20 vol% O₂ in N₂ at 1 bar. The DBDs were characterised by iCCD camera imaging determining the filament number and the discharge development by a streak camera to obtain the filament positions during different phases of one HV period. Simultaneously, electrical measurements using fast probes were performed. The results clearly show the different effects of the performed parameter variations on pulsed and sine-driven discharges, particularly regarding the spatial stability and number of filaments. Finally, the findings for the multi-filament arrangement are linked to single-filament DBDs under the same experimental conditions.

Funded by the DFG – project number 466331904.

Keywords: Dielectric barrier discharges; Filament interaction; Electrical and optical diagnostics