Mainz 2022 – scientific programme

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P: Fachverband Plasmaphysik

P 9: Poster I

P 9.7: Poster

Tuesday, March 29, 2022, 16:00–17:30, P

Simulations of the penetration of RMP fields into ASDEX Upgrade plasmas — •Verena Mitterauer and Matthias Hölzl — Max Planck Institute for Plasma Physics, Boltzmannstrasse 2, 85748 Garching - Germany

A proposed mechanism for the mitigation of edge localized modes (ELMs) is the application of small non-axisymmetric magnetic fields by external coils, known as resonant magnetic perturbations (RMPs). Various effects are observed in the plasma in response to RMPs, among others, the stochastization of the edge region, the formation of magnetic islands and the reduction of the edge density and toroidal rotation. A combination of these responses is thought to cause either ELM mitigation or suppression. However, exact mechanisms and extrapolation to ITER are still uncertain such that non-linear simulations are needed. In this work, the JOREK-STARWALL code suite is used for the first time to simulate the effects of RMPs on plasmas with parameters relevant to RMP-ELM suppression experiments in ASDEX Upgrade. The use of the STARWALL extension allows to include the full plasma response to the perturbation field up to the boundary.

Simulations with realistic plasma parameters are compared to the experiment for a plasma configuration that is relevant for ELM suppression studies. A similar corrugation is observed in modelling and experiment. Further simulations are on the way to investigate the interaction of ELM instabilities with the perturbation fields. To capture experiments more accurately, a fluid model with kinetic closure will be developed that can describe neoclassical toroidal viscosity (NTV).