Düsseldorf 2007 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 20: Plasma-Wand-Wechselwirkung
P 20.1: Fachvortrag
Donnerstag, 22. März 2007, 14:35–15:00, 6C
Neutral particle transport effects in large 2D divertor plasmas — •Vladislav Kotov1, Detlev Reiter1, Andrey Kukushkin2, Petra Börner1, and Sven Wiesen1 — 1Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM-Association, Trilateral Euregio Cluster, D-52425, Julich, Germany — 2ITER International Team, Cadarache, France
Predicting the heat load on the plasma-facing components and the impurity content in the edge plasma is of crucial importance for the design of a tokamak fusion reactor. The conditions at the plasma edge and, especially, in the most severely loaded divertor region are largely determined by the interaction between the plasma and the neutral particles produced by recombination and sputtering. An integrated code which combines the multi-species 2D fluid plasma transport code B2 and the 3D Monte-Carlo neutral gas and radiation transport code EIRENE is currently used to guide the design of the ITER divertor. This code package is now updated with an improved model for low temperature hydrogen molecular kinetics. It is also extended to take into account intrinsically non-linear effects: neutral-neutral collisions and line radiation opacity in a self consistent way. The influence of these new features on the self consistent gas-radiation-plasma solution is studied for the large tokamaks ITER and JET. It is found in both cases that the refined description of molecular kinetics has a strong effect on the predicted plasma parameters in front of the divertor targets and on the divertor heat loads. The impact of the non-linear effects can be also significant for the ITER conditions (and larger machines, e.g. DEMO).