Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.23: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Gyrokinetic pedestal studies varying shaping in AUG — •Facundo Sheffield1, Tobias Goerler1, Lidija Radovanovic2, Elisabeth Wolfrum1, Frank Jenko1, and the ASDEX Upgrade team3 — 1Max-Planck-Institut für Plasmaphysik — 2Institute of Applied Physics, TU Wien — 3See author list of H. Zohm et al, 2024 Nucl. Fusion https://doi.org/10.1088/1741-4326/ad249d
The pedestal region in tokamak plasmas plays a critical role in determining overall confinement and performance, yet the interplay between turbulence and plasma shaping within this region remains to be fully understood. In this work, we present a comprehensive characterization of pedestal instabilities and their sensitivity to plasma shaping effects using the gyrokinetic code GENE. Key turbulence modes, including kinetic ballooning modes and electron temperature gradient modes (ETG), are identified and compared in differently shaped ASDEX Upgrade equilibria to assess their impact on transport and stability. Further insights into the nature and characterization of ion-frequency ETG modes are discussed. The influence of shaping parameters, mainly triangularity and elongation, is systematically explored with linear and global nonlinear simulations. The findings presented reveal novel dependencies between pedestal turbulence properties and shaping.
Keywords: plasma; tokamak; turbulence; gyrokinetics; GENE