Göttingen 2025 – scientific programme

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P: Fachverband Plasmaphysik

P 10: Poster Session I

P 10.23: Poster

Tuesday, April 1, 2025, 16:15–18:15, ZHG Foyer 1. OG

Inclusion of MHD effects in the transport description of tokamak plasmas — •Federico Stefanelli, Emiliano Fable, Clemente Angioni, and Hartmut Zohm — Max-Planck-Institute for Plasma Physics, 85748 Garching, Germany

This project aims to include MHD effects in the transport description of tokamak plasmas, in particular Sawtooth Cycles, Magnetic Flux Pumping and Neoclassical Tearing Modes (NTMs). Including such effects is relevant for a comprehensive transport description, as solving the transport equations provides the drive for MHD instabilities, and the non-linear evolution of such instabilities affects transport. Furthermore, many MHD effects, such as the Sawtooth Cycles or the NTMs, must be avoided or controlled, as they could lead to a loss of performance or disruptions. On the other hand, Magnetic Flux Pumping can provide a desirable operational regime for future machines, with a sawtooth-free core and an optimal redistribution of the core current. Reduced models for such effects would be then relevant for tokamak control applications. The approach followed in this work will be to implement reduced models for the triggering and evolution of such effects in the ASTRA transport code, to be validated on ASDEX Upgrade discharge. For the Sawtooth Cycles and the NTMs, these models will be taken from the literature, while for magnetic flux pumping it will be necessary to develop the reduced model as well.

Keywords: Transport; Reduced Modeling; Sawtooth Cycles; Magnetic Flux Pumping; Neoclassical Tearing Modes