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P: Fachverband Plasmaphysik

P 6: Low temperature plasmas I

P 6.1: Hauptvortrag

Dienstag, 1. März 2016, 11:00–11:30, b302

ns-Pulsed Micro-Plasmas at Atmospheric Pressures — •Uwe Czarnetzki — Institute for Plasma and Atomic Physics, Faculty of Physics and Astronomy, Ruhr University Bochum, 44801 Bochum, Germany

In recent years transient micro-plasmas at atmospheric pressures have seen an amazing revival in research interest. This is partly related to new opportunities in application, especially in the emerging field of biological/medical application, and partly to the availability of novel techniques in simulation and diagnostics. ns-pulsed plasmas are characterized by fast ionization waves, effectively stationary ions but high dynamics of the electron species. After ignition, a short phase of sheath-bulk structure is usually followed by a much longer afterglow phase. There a complicate collisional dynamics including electron cooling and heating, recombination, and excimer formation sets in even for "simple" noble gases like helium or argon. The dynamics in noble gases as well as in diatomic molecules (nitrogen and hydrogen) is studied by laser electric field measurements, Thomson scattering, laser absorption measurements, emission spectroscopy, and electrical measurements. A rather wide variety of different discharge configurations is investigated. The diagnostics allow a detailed insight into the physics governing these systems and general characteristics are revealed.