Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 16: Poster Session - Helmholtz Graduate School for Plasma Physics

P 16.7: Poster

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

EMC3-Eirene simulations of gas puff effects on edge density and ICRF coupling in ASDEX Upgrade — •Wei Zhang1,2, David Coster1, Jean-Marie Noterdaeme1,2, Tilmann Lunt1, Volodymyr Bobkov1, Yuehe Feng1, and ASDEX Upgrade team11Max Planck Institute for Plasma physics, Garching, Germany — 2University of Ghent, Ghent, Belgium

Ion cyclotron range of frequency (ICRF) heating relies on the Fast Wave (FW) to transport the power from the edge (the antenna) to the plasma center. Since the FW is evanescent below a critical density (typically in the 1018 m−3 range), the wave does not propagate in the region where the density is below this value in the very edge of the plasma. The coupling depends strongly on the width of this region. The distance between the ICRF antenna and the FW cut-off layer can be made smaller by increasing the edge density in front of the ICRF antenna.

Previous experiments in many tokamaks and preliminary simulation results for AUG and JET with EDGE2D-EIRENE show that the edge density could indeed be increased with gas puffing at the top of the vessel or in the midplane. But the 2D code cannot quantitatively reproduce the experimental results, mainly due to the assumptions of toroidal axisymmetry. EMC3-EIRENE is a 3D Edge Monte Carlo plasma fluid transport code. By including the toroidal nonaxisymmetric plasma facing components and 3D positions of gas valves in the code, the simulations can be made more realistic. We will show first simulation results of the code and a comparison to experiments.

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