Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 13: Magnetic Confinement IV/HEPP IV
P 13.1: Talk
Wednesday, February 28, 2024, 11:00–11:25, ELP 6: HS 3
Non-linear free boundary simulations of resonant magnetic perturbations in ASDEX Upgrade — •Verena Mitterauer1, Matthias Hoelzl1, Matthias Willensdorfer1, and ASDEX Upgrade Team2 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2See author list of U. Stroth et al. 2022 Nucl. Fusion 62 042006
The suppression of ELMs by resonant magnetic perturbations RMPs in an ASDEX Upgrade plasma is modeled using the free boundary MHD code JOREK-STARWALL. The simulations are performed with fully realistic plasma parameters and plasma flows, which allows qualitative and quantitative comparisons with experimental observations, reveals important mechanisms, and forms a basis for more accurate predictive studies than previously possible. Simulations of the ELM suppressed state show a local structure in the radial displacement of the plasma around resonant surfaces that can be linked to the presence of magnetic islands. Together with recent experimental findings, this provides strong indications for the presence of a magnetic island chain at the pedestal top during ELM suppression in an ASDEX Upgrade discharge, contributing to resolving a long-standing open question. Furthermore, the transition out of the ELM-suppressed phase into an ELM-unstable state is modeled through an increase of the pedestal density values. The simulations allow to disentangle the role for suppressing ELM instabilities of the edge pressure profile evolution on one hand and non-linear coupling between peeling-ballooning instabilities with the RMP-driven perturbations on the other hand.
Keywords: Non-linear Simulations; Magnetohydrodynamics; Resonant Magnetic Perturbations