München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.89: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

A Heuristic Dimits Shift Prediction using Reduced Tertiary Instability Analysis — •Axel Hallenbert and Gabriel Plunk — Max-Planck-Institut for Plasma Physics, Greifswald, Germany

Following the recent development of a heuristic Dimits shift prediction method by St-Onge yielding accurate results in a simple modified Terry-Horton system, the feasibility of further extending this method to more physically complete systems is investigated. The ultimate aim being a Dimits shift prediction in general gyrokinetic systems and magnetic field geometries, investigations into an intermediary, local, strongly driven gyrokinetic limit, retaining both linear drive and nonlinear zonal-drift wave interactions, is presented. By the ad-hoc inclusion of damping into this system a Dimits shift can be made to arise, and through slight modifications to the original method, the revised prediction method continues to yield consistently acceptably accurate results for a broad array of different parameter realisations, hinting at its further viability for next describing full gyrokinetics in simple magnetic geometries.

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