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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.75: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Advancing Tokamak Edge Stability Predictions with Extended-MHD Modelling — •Michael Sieben1, Michael Dunne1, Jonas Puchmayr1, Roxana Takacs1, and the ASDEX Upgrade Team2 — 1Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany — 2See author list of H. Zohm et al 2024 Nucl. Fusion 64 112001
The high-confinement mode (H-mode) is an operational regime achieved in many present tokamaks, including ASDEX Upgrade (AUG), and is expected to be accessed in the future by ITER. In H-mode, a transport barrier, the so-called pedestal, forms at the plasma edge, where steep temperature and density gradients can drive magnetohydrodynamic (MHD) instabilities and trigger rapid heat and particle losses that can be hazardous for plasma-facing components. Predicting pedestal stability limits is therefore essential for H-mode operation. MHD models combined with an assumption on the transport in the pedestal, such as IPED [1], can be used to predict the pedestal structure prior to such events. Here, we present three extensions to IPED that improve edge stability predictions: (1) high-precision equilibrium reconstruction using the GVEC code [2]; (2) inclusion of extended-MHD physics through integration of CASTOR3D [3]; and (3) a robust growth-rate prediction based on an iterative search in the complex eigenvalue space. We demonstrate how these extensions affect predicted stability limits in both predictive and interpretive analyses of H-mode plasmas at AUG. [1] Dunne M.G. et al. 2017, [2] Hindenlang F. et al. 2019, [3] Strumberger E. et al. 2016.
Keywords: H-mode; IPED; linear extended-MHD; Plasma stability; Edge Localized Modes