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P: Fachverband Plasmaphysik
P 9: Simulationsverfahren/Theorie/Modellierung
P 9.6: Talk
Tuesday, March 13, 2012, 15:50–16:05, V57.01
Electron cooling in afterglow plasmas — •Tsanko Vaskov Tsankov1, Yusuf Celik1, Dirk Luggenhölscher1, Uwe Czarnetzki1, Mitsutoshi Aramaki2, and Shinji Yoshimura3 — 1Institute for Plasma and Atomic Physics, Ruhr-University Bochum, 44780 Germany — 2Department of Electrical Engineering and Computer Science, Nagoya University, 464-8603, Japan — 3National Institute for Fusion Science, Toki 509-5292, Japan
A number of investigations – both theoretical and experimental – examine the electron temperature drop in the afterglow of low pressure atomic plasmas but a satisfactory self-consistent description of the cooling process is still missing. Here, we present a simple analytical fluid model which provides a consistent description of the diffusional decay of the electron density ne and temperature Te. The model predicts not only an exponential behaviour for the inverse of the electron temperature 1/Te but also a drastic change in the cooling process after the electron temperature reaches the gas temperature. These predictions are supported by time-resolved measurements of ne and Te and by a 2D simulation for the case of argon afterglow at 1 Pa.