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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.48: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Initial ignition phase of a micro cavity plasma array — •Sebastian Dzikowski, Marc Böke, and Volker Schulz-von der Gathen — Experimentalphysik II, Ruhr-Universität Bochum, Bochum, Germany

Micro cavity plasma array devices have gained increased attention over the last years for large scale applications such as surface treatment and catalysis. A representative is a MCPA formed by two electrodes and a dielectric foil in between. The grounded electrode realized by a magnet is covered with a 40 microns thick dielectric of zirconium oxide. A 50 microns thick nickel grid containing hundreds to thousands symmetrically arranged holes is magnetically fixed on the dielectric and works as the powered electrode. The formed cavities have a diameter of about 200 microns and due to the magnetic holding all components can be exchanged easily. Here, this device operates with bursts consisting of about 20 bipolar triangular voltage pulses in a range between 800 and 1400 V (peak-to-peak) at 15 kHz close to atmospheric pressure. Just few hundred microseconds after the initial ignition this device already shows a time stable character. We investigate how this steady state is reached and which mechanisms are responsible for that. For an estimation of the internal electric field and rotational temperatures depending on the excitation cycles optical emission spectroscopy (OES) is used. This project is supported in frame of the SFB CRC 1316 "Transient Atmospheric Pressure Plasmas - From plasma to liquids to solids".