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P: Fachverband Plasmaphysik
P 20: Plasma-Wand-Wechselwirkung
P 20.3: Vortrag
Donnerstag, 22. März 2007, 15:15–15:30, 6C
Model extensions of the 3D edge plasma fluid Monte Carlo code EMC3 — •Derek Harting1, Detlev Reiter1, Heinke Frerichs1, and Yühe Feng2 — 1Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATUM Association, Trilateral Euregio Cluster, D-52425 Jülich, Germany — 2Max-Plank-Institut für Plasmaphysik, EURATOM Association, 17491 Greifswald, Germany
The 3D edge plasma code EMC3/EIRENE has already been used to simulate the edge plasma of various different magnetic fusion devices (W7AS, W7X, LHD, ITER) and it is currently validated in particular with TEXTOR-DED experimental data. In order to make connection to the physical model of well established 2D edge plasma codes (such as B2-EIRENE) some extensions to the EMC3 code are developed. The energy balance equation is further completed and kinetic corrections (“flux limiter”) to the fluid model which are also standard in 2D fluid plasma edge codes are implemented. Especially the term ∇→·(1/2mnV2V→) in the energy balances, which was originally neglected, showed a strong influence on Ti in front of the target. For TEXTOR this term leads to a localized adiabatic cooling of the ions by about 25% (10eV), as the flow is accelerated towards the target. Te is effected only weakly by this term. Due to the more than ten times faster conductive parallel heat transport of the electrons, the cooling of the electrons by acceleration of flow towards the target extends nearly over the entire edge plasma and Te is reduced by about 3-4 eV. The various extensions to the EMC3 code will be described, and their effects on the predicted edge plasma conditions of the tokamak TEXTOR will be discussed.