Hannover 2020 – scientific programme
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P: Fachverband Plasmaphysik
P 5: Poster Session 1
P 5.3: Poster
Monday, March 9, 2020, 16:30–18:30, Empore Lichthof
Improving Tokamak pedestal prediction — •Jonas Puchmayr1,2, Mike Dunne2, and Hartmut Zohm2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstraße 4, D-80799 München — 2Max-Planck-Institut für Plasmaphysik, D-85748 Garching bei München
The high confinement mode (H-mode) is a regime where self-organized suppression of turbulence in the edge region leads to increased profile gradients. The pedestal is limited by the occurrence of edge localized modes (ELMs), quasi-periodic bursts of particles and energy at the plasma edge. ELMs can be described as coupled peeling-ballooning modes in an MHD framework where the edge pressure gradient and current density provide the free energy to create an instability. The EPED framework is a predictive model which calculates the bootstrap current and uses equilibrium and stability codes to scan intermediate toroidal mode numbers. The pedestal width is self-consistently determined by a scaling law, which in later versions of EPED is proposed to be a kinetic ballooning mode (KBM). For high triangularities, the EPED model predicts enhanced pedestal pressure, the Super H-mode. In this work, the EPED model was improved by implementing a more accurate bootstrap model and scanning a wider range of toroidal modes. The effect of including lower mode numbers, using a critical gradient instead of the KBM is analyzed and different bootstrap models on the predicted pedestal are shown. Recovering published Super H-mode results from other machines and extending the model to ASDEX Upgrade is envisaged.