Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 14: Poster Session - Theory and Modelling

P 14.4: Poster

Dienstag, 3. März 2015, 16:30–18:30, Foyer Audimax

Self-consistent collisional-radiative model for non-uniform argon plasmas: with or without "escape factor" — •Xi-Ming Zhu, Tsanko Tsankov, Dirk Luggenhölscher, and Uwe Czarnetzki — Institute for Plasma and Atomic Physics, Ruhr-University Bochum, 44780 Bochum, Germany

Collisional-radiative models for low-temperature rare-gas plasmas are widely investigated [1]. When the plasmas are optically thick, an "escape factor" is used to account for radiation trapping, assuming a uniform density profile of excited atoms [2]. However, this assumption is not satisfied in non-uniform plasmas. This work reports a self-consistent collisional-radiative model for the Ar(2p) states (Paschen's notation) without an ad hoc "escape factor". The rate balance equations are numerically solved to yield the actual density profiles. The predicted Ar(2p) densities are compared with those from a spatial measurement by an optical probe [3]. The novel model agrees well with the experiment but the "escape factor" model does not. The shortcomings of "escape factor" concept used previously are thus revealed. [1] X M Zhu and Y K Pu, J. Phys. D: Appl. Phys. 43, (2010) 403001 [2] X M Zhu, Y K Pu, Y Celik, S Siepa, E Schüngel, D Luggenhölscher and U Czarnetzki, Plasma Sources Sci. Technol. 21, (2012) 024003 [3] B Du, Y Celik, D Luggenhölscher and U Czarnetzki, Plasmas Sources Sci. Technol. 19, (2010) 045008