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P: Fachverband Plasmaphysik

P 14: Atmospheric Pressure Plasmas and their Applications II

P 14.2: Vortrag

Donnerstag, 2. September 2021, 14:30–14:45, H5

From single- to multi-filament arrangements for pulsed dielectric barrier discharges — •Hans Höft, Manfred Kettlitz, and Ronny Brandenburg — Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Straße 2, 17489 Greifswald, Germany

It has been demonstrated that the discharge characteristics in pulsed-operated single-filament dielectric barrier discharges (DBDs) can be controlled by varying the pulse width of the applied high voltage (HV). The transfer of this knowledge to multi-filament DBDs is crucial for the further understanding and design of plasma reactors. Therefore, a direct comparison between a single-filament and a multi-filament arrangement driven by the same HV pulses with variable pulse width was performed in a gas mixture of 0.1 vol% O₂ in N₂ at 1 bar. Both arrangements feature a 1 mm gap with alumina-covered electrodes, with two hemispherical electrodes for the single-filament and two parallel tube electrodes for the multi-filament arrangement. The DBDs were characterised by electrical measurements (for energy, power, transferred charge, peak current) accompanied by synchronised iCCD imaging determining the filament number and the discharge development in the gas gap and on the surfaces. Generally, most physical quantities scale with the filament number. The impact of pre-ionisation on the DBD characteristics is very similar, although the filament number depends on the pre-ionisation.

This work was supported by the DFG-project MultiFil (DFG project number 408777255).