Bochum 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
P: Fachverband Plasmaphysik
P 11: Low Temperature Plasmas I
P 11.3: Vortrag
Dienstag, 3. März 2015, 14:55–15:10, HZO 30
Excitation Dynamics and Alpha to Gamma Transition in an Argon Micro Atmospheric Pressure Plasma Jet: Diagnostics and Modelling — •Mario Dünnbier1,2, Markus Becker1, Detlef Loffhagen1, Klaus-Dieter Weltmann1, and Stephan Reuter1,2 — 1Centre for Innovation Competence plasmatis, 17489 Greifswald, Germany — 2Leibniz Institute for Plasma Science and Technology e.V. (INP Greifswald), 17489 Greifswald, Germany
Argon as a feed gas for a novel megahertz driven atmospheric pressure plasma jet (APPJ) has been investigated experimentally and numerically. The micro-scale APPJ under consideration usually runs with helium and is well described in the literature [1]. Up to now it was impossible to ignite a discharge in argon within this jet geometry. To meet this challenge a self-made plasma tuning unit (PTU) was designed. Additionally the PTU enables the measurements of the dissipated power in the plasma itself. Therefore, the power can be varied in the range between 500 and 1500 mW. Phase resolved optical emission spectroscopic measurements of the argon transition at 750.39 nm shows only one intensity maximum at each half cycle of the applied voltage for the low power range. At increasing power a second maximum arises immediately after the first one. Comparison with numerical modelling shows that the first maximum contributes to the excitation due to bulk electrons and the second maximum to secondary electrons from the electrodes.
[1] S. Schneider, M. Dünnbier et al., J. Phys. D: Appl. Phys. 47 50520, 2014