Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.26: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Impact of fishbone modes to core microturbulence with global gyrokinetic simulations — •davide brioschi1, alessandro di siena1, roberto bilato1, alberto bottino1, thomas hayward-schneider1, alexey mishchenko2, emanuele poli1, alessandro zocco2, and frank jenko1 — 1Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany — 2Max Planck Institute for Plasma Physics, Greifswald 17491, Germany
Fishbone instabilities (FBs) are a class of macroscopic plasma modes which develop inside tokamaks around rational surfaces. Theoretical and experimental results show a correlation between the development and/or sustainment of ITBs inside tokamak plasmas and the destabilization of FBs. These studies point out the need for a self-consistent description of the interaction of FBs with plasma microturbulence, i.e. the main driving mechanism of turbulent transport inside tokamaks detrimental for plasma confinement. Our work wants to study such an interaction through gyrokinetic simulations performed with the code GENE and ORB5, including both the n=m=1 FB (with n and m tororidal and poloidal mode number respectively) and the ion temperature gradient (ITG) mode branches inside the plasma. Multiscale interaction between turbulence, global FB structures and zonal flows is studied via dedicated nonlinear simulations, starting from results obtained through linear ones used to identify the ideal subset of the parameters space where all these modes are present at once.
Keywords: plasma turbulence; magnetohydrodynamics; gyrokinetic theory; fast particles; multiscale interaction