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P: Fachverband Plasmaphysik

P 25: Poster Session- Theory and Modelling

P 25.6: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

Electromagnetic resistive-interchange model for type-III- ELM-like limit cycles — •Federico Pesamosca^1,2, Peter Manz^2,3, and Matteo Passoni¹ — ¹Politecnico di Milano, 20133 Milano, Italy — ²Max- Planck-Institut für Plasmaphysik, 85748 Garching, Germany — ³Physik-Department E28, Technische Universität München, 85748 Garching, Germany

At the transition from low to high confinement regimes in magnetically confined plasmas regular pulsations in the low kilohertz range occur which are referred to as limit cycles oscillations (LCOs). It is believed that these LCOs are a result of the interaction between zonal fows and drift-wave turbulence whose basis is described by the zero dimensional (0D) Kim-Diamond model. Recent investigations in ASDEX Upgrade have shown that LCOs are not only seen in the magnetic signal, they even show precursor activity identical to type-III ELMs which are believed to be resistive interchange dominated. Also ELMs can be described by 0D-MHD models. To enlighten the role of magnetic fluctuations in the LCO dynamics in general and those of the precursors in particular a model including both zonal fows and MHD is desirable. This has been done by deriving a 0D-model from the 3D electromagnetic turbulence model DALF3. Within the presented model the LCO dynamics has been studied for ASDEX Upgrade conditions.