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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.37: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Reduced Modelling of MHD instabilities and Internal Transport Barriers — •Erik Eidsvig1,2, Philipp Lauber1,2, and the ASDEX Upgrade Team2 — 1Technical University of Munich — 2Max Planck Institute for Plasma Physics
Experimentally, fishbones have been observed before the Internal Transport Barrier (ITB) formation in ASDEX Upgrade. In this work, the goal was to investigate the relationship between the fishbone instability and the internal transport barriers. As a first step, reduced models describing the fishbone dynamics and its relationship to turbulence were implemented numerically. The fishbone instability is connected to the turbulence through the current it generates, which drives a poloidal shear flow which can break up turbulent eddies. It was found that the deposition rate of trapped energetic particles, D was the most important factor for setting up the Internal Transport Barrier (ITB), agreeing with the findings from Liu and Fu (2023). The reduced models were tested on ASDEX Upgrade discharge #37114, and the simplified flow shear approximation alone is not sufficient to explain the temperature peaking in the shot. This may indicate that the magnetic shear plays a role in the ITB state observed in the shot.
Keywords: Fishbone instability; Internal transport barriers; Energetic particles; Reduced modelling; ASDEX Upgrade