SMuK 2021 – scientific programme
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P: Fachverband Plasmaphysik
P 5: Poster I
P 5.16: Poster
Tuesday, August 31, 2021, 14:00–16:00, P
Linear MHD stability analysis of pedestals in magnetically perturbed tokamak equilibria — •Jonas Puchmayr1,2, Mike Dunne2, Erika Strumberger2, and Hartmut Zohm2 — 1Department of Physics, Ludwig-Maximilians-Universität, Schellingstr. 4, 80799 München, Germany — 2Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany
In the regime of high confinement (H-mode), a region of self-organized suppression of turbulent transport at the plasma edge forms resulting in steep gradients of pressure, temperature and density evolve. The edge gradients provide free energy for a new type of instability, Edge Localized Modes (ELMs). These instabilities are well-described by linear MHD and can be identified as coupled peeling-ballooning modes. Experimentally, ELMs cause large quasi-periodic bursts of particle and energy loss, that will lead to severe damage in future fusion devices. For this reason, control of ELMs is inevitable for H-mode operation in future machines. Resonant magnetic perturbation (RMP) fields are observed to mitigate or suppress ELMs. These perturbation fields break the axisymmetry of tokamak equilibria, resulting in weakly 3D configurations.
In this work, the code CASTOR3D is used to study (non-)ideal MHD stability of weakly 3D tokamak equilibria. Toroidal mode coupling is observed and the ideal MHD energy functional, which is newly implemented in CASTOR3D, is used to analyze the eigenfunctions and understand the change that the 3D structure has on stability.