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P: Plasmaphysik

P 19: Magnetischer Einschluß 2

P 19.5: Vortrag

Montag, 7. März 2005, 15:45–16:00, HU 3038

Computational Parameter Studies on Ergodic Edge Transport in TEXTOR-DED — •Derek Harting¹, D. Reiter¹ und Y. Feng² — ¹Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM Association, Trilateral Euregio Cluster, D-52425 Jülich, Germany — ²Max-Planck-Institut für Plasmaphysik, EURATOM Association, 17491 Greifswald, Germany

Since th 3D edge plasma fluid codepackage EMC3-EIRENE was adapted for the ergodic divertor in the tokamak TEXTOR-DED in 2003, several parameter studies with this codepackage have been carried out. Key findings of these first modeling campaigns are reported here: the recycling neutrals lead to a local flow reversal of the charged plasma particles in front of the divertor surface at leat partially due o overcharging of individual flux bundles by recycling neutrals. The perturbation field, the total recycling flux and the anomalus perpendicular transport parameters for particles, momentum and energy were varied. In this task, the variation of the perturbation field showed, that with increasing perturbation field, the plasma density is decreased over the whole domain. The electron and ion temperature profiles are mainly affected by the perturbation filed in a poloidal modulation, which correlates with the island structure of the Poincaré-Plots. Finaly, a simple effective radial heat transport analysis was carried out, to study the influence of the perturbation field on the radial heat transport. This has shown, as expected, that inside the islands the radial temperature profile is flattened, and on the last 2 cm in front of the divertor surface, the radial heat flux is increased due to the bending of the field lines.