Kiel 2011 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 15: Theorie/Modellierung I

P 15.1: Hauptvortrag

Mittwoch, 30. März 2011, 14:00–14:30, HS C

Multiscale effects in plasma microturbulence - from electron gyroradius to system size scales — •Tobias Görler — Max-Planck-Institut für Plasmaphysik, EURATOM-Association, D-85478 Garching

One of the remaining key physics problems on the way to efficient fusion power plants based on toroidal magnetic confinement is the thorough understanding and reliable prediction of the so-called anomalous transport across the magnetic surfaces. It is by now commonly attributed to plasma microturbulence being generated by various types of microinstabilities. The latter extract free energy from the inevitable background temperature and density inhomogeneities. Both numerical and experimental investigations have demonstrated that the range of involved space scales may extend from the electron gyroradius all the way to the machine size. Correspondingly, the time scales of interest are determined by the fast electron dynamics on the one hand and the comparatively slow energy confinement time on the other. In this contribution, various state-of-the-art theory approaches to a comprehensive treatment of such challenging multiscale problems are presented. In this context, examples of successful applications of massively parallelized numerical implementations of the gyrokinetic theory framework are shown and comparisons to experiments are given.