Berlin 2014 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 30: Plasma Wall Interactions
P 30.7: Vortrag
Freitag, 21. März 2014, 15:45–16:00, SPA HS202
Multiscale modeling approach for self-consistent coupling of drift-fluid turbulence and macroscale transport in the tokamak plasma edge — •Felix Hasenbeck1, Dirk Reiser1, Philippe Ghendrih2, Yannick Marandet3, Patrick Tamain2, and Detlev Reiter1 — 1IEK-4 - Plasma Physics, Forschungszentrum Jülich GmbH, Jülich, Germany — 2CEA Cadarache, DRFC/SPPF, Saint-Paul-lez-Durance, France — 3PIIM, CNRS/Université de Provence, Marseille, France
Plasma transport in the edge region of tokamaks occurs on a wide range of separated temporal and spatial scales. Iterative multiscale modeling approaches are investigated to split the problem into sub-systems which can then be solved independently. In the current work, the local, gradient driven version of the drift-fluid turbulence code ATTEMPT is used to resolve the microscale transport processes on the millimeter/microseconds scale. Macroscopic evolution of the density on the centimeter/milliseconds scale is described by a 1D code. Benchmarking of this code package against full global, flux driven ATTEMPT simulations shows that the time evolution of flux surface averaged radial density profiles can indeed be reproduced under the assumption of a diffusive macroscale transport model. Diffusion coefficients are in the range of 0.1 to 0.4 m2/s (ne≈ 1019 m−3, Te = 100 eV, B = 1 T) and in agreement with values typically chosen for macroscale transport simulations. Further extension of the approach providing a more solid physical basis for cross-field transport coefficients in fusion edge transport codes (currently free model parameters) will be outlined.