Hannover 2020 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 5: Poster Session 1

P 5.17: Poster

Montag, 9. März 2020, 16:30–18:30, Empore Lichthof

Gyrokinetic investigation of the damping channels of Alfvén modes in ASDEX Upgrade — •Francesco Vannini, Alessandro Biancalani, Alberto Bottino, Thomas Hayward-Schneider, Philipp Lauber, Alexey Mishchenko, Ivan Novikau, Emanuele Poli, and ASDEX Upgrade Team — Max Planck Institute for Plasma Physics, Garching (Germany)

The linear destabilization and nonlinear saturation of energetic-particle driven Alfvénic instabilities in tokamaks strongly depend on the damping channels. In this work, the collisionless damping mechanisms of Alfvénic modes are investigated within a gyrokinetic framework, by means of global simulations with the particle-in-cell code ORB5, and compared with the eigenvalue code LIGKA and reduced models. In particular, the continuum damping and the Landau damping (of ions and electrons) are considered. The electron Landau damping is found to be dominant on the ion Landau damping for experimentally relevant cases. As an application, the linear and nonlinear dynamics of toroidicity induced Alfvén eigenmodes and energetic-particle driven modes in ASDEX Upgrade is investigated theoretically and compared with experimental measurements (see [Vannini-2019], submitted to Physics of Plasmas, arXiv:1910.14489).