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P: Fachverband Plasmaphysik
P 14: Atmospheric Pressure Plasmas and their Applications II
P 14.3: Vortrag
Donnerstag, 2. September 2021, 14:45–15:00, H5
Spatiotemporal emission of an atmospheric plasmoid — •Roland Friedl1, Saskia Steibel1, Victor Slavov2,3, and Ursel Fantz1,3 — 1AG Experimentelle Plasmaphysik, Universität Augsburg, 86135 Augsburg — 2Faculty of Physics, University of Sofia, 1164 Sofia, Bulgaria — 3Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching
An atmospheric pressure plasmoid is generated via a high voltage discharge (4.8 kV) above a water surface. After around 150 ms the connection to the power supply is interrupted and the plasmoid enters an autonomous phase which lasts up to 400 ms. The plasmoid has a diameter of around 30 cm and ascends in air with a velocity of about 1–2 m/s. High speed video analysis (600 fps) and optical emission spectroscopy is applied to gain insight into the plasma dynamics.
Survey spectrometers (Δλ ∼ 1.4 nm) are applied to determine the dominant radiating plasma constituents for the three main evolution phases of the plasmoid: ignition, formation, and autonomous phase. Photo diodes with interference filters (Δλ ∼ 10 nm) are used for monitoring the emission of specific plasma constituents (H, OH, Na) with high temporal resolution (0.5 ms). High resolution spectroscopy (Δλ ∼ 0.16 nm) with a high speed trigger system is applied to measure the OH-A-X emission system during the temporal evolution of the plasmoid. In order to gain access to the plasma chemistry, rotational and vibrational temperatures of the hydroxyl molecule are evaluated using Lifbase, while its absolute emissivity is analyzed by collisional-radiative modeling.