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P: Plasmaphysik
P 19: Magnetischer Einschluß 2
P 19.2: Vortrag
Montag, 7. März 2005, 15:00–15:15, HU 3038
Effect of Stochastization on Electromagnetic Fluid Drift Turbulence in Fusion — •D. Reiser1, B.D. Scott2, and T. Haberscheidt1 — 1Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM, Association, Trilateral Euregio Cluster,D-52425 Jülich, Germany — 2Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany
Fluid drift turbulence is considered as a major ingredient of the so called anomalous transport in magnetically confined plasmas, causing a deterioration of confinement properties by a strong radial transport. This work gives an introduction into the theory of small scale drift turbulence relevant for the plasma edge of present fusion devices. The technical option to ergodize magnetic fields in fusion relevant tokamak experiments by externally induced magnetic perturbation fields offers the opportunity to influence drift instabilities and therefore the turbulent behaviour of plasmas. Numerical simulations are presented, illustrating the effect of magnetic islands due to single mode perturbation fields and the changes in the turbulent transport for scenarios with multi-mode perturbations (stochastization). These results are compared to experimental results measured at EXTOR-DED. The question of a suppression of ballooning mode dominated turbulence and it’s relevance for Edge Localized Modes (ELMs) will be addressed.