Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 21: Theory and Modelling II

P 21.2: Fachvortrag

Mittwoch, 4. März 2015, 14:30–14:55, HZO 50

2D multiscale model for coupling mesoscale drift fluid dynamics and macroscale particle transport in the tokamak plasma edge — •Felix Hasenbeck¹, Dirk Reiser¹, Philippe Ghendrih², Yannick Marandet³, Patrick Tamain³, and Detlev Reiter¹ — ¹IEK-4 - Plasmaphysik, Forschungszentrum Jülich GmbH, Jülich, Germany — ²CEA Cadarache, DRFC/SPPF, Saint-Paul-lez-Durance, France — ³PIIM, CNRS/Université de Provence, Marseille, France

Radial transport in the plasma edge is decisive for the lifetime and performance of a tokamak fusion reactor. While mesoscale drift fluid models allow for detailed assessment of transport processes, they remain computationally expensive for predictions on the reactor scale. So-called macroscale transport codes are less resource-demanding but typically describe radial transport via simplified models with empirical transport coefficients. Here, a multiscale approach is presented which includes the effects of averaged mesoscale dynamics on the macroscale profiles. Its implementation within the B2-ATTEMPT coupled code system for enhanced radial particle transport description is outlined. Simulations of experiments performed at the tokamak TEXTOR show reasonable agreement for profiles of n_e and T_e at the outer midplane with a 5 to 25% level of uncertainty. The poloidal dependence of self-consistently determined profiles of the radial particle diffusion coefficient D reflects the ballooning character of transport. Typical values of D are between 0.3 and 0.9 m²/s and are within a 10 to 30% range of effective diffusion coefficients employed hitherto in B2-EIRENE simulations with freely adjusted radial diffusivities to match experiments.