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P: Fachverband Plasmaphysik
P 9: Poster I
P 9.24: Poster
Tuesday, March 29, 2022, 16:00–17:30, P
Gyrokinetic modelling of anisotropic energeticparticle driven instabilities in tokamak plasmas — •Brando Rettino1, Thomas Hayward-Schneider1, Alessandro Biancalani2,1, Alberto Bottino1, Philipp Lauber1, Ilija Chavdarovski3, Francesco Vannini1, and Frank Jenko1 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2Leonard de Vinci Pole Universitaire, Research Center, 92916 Paris la Defense, France — 3Korea Institute of Fusion Energy, 34133 Daejeon, South Korea
Energetic particles produced by plasma heating are observed to excite energetic-particle-driven geodesic acoustic modes (EGAMs) in tokamaks. We study the effects of velocity space anisotropy of the EP distribution functions on the excitation of such instabilities with ORB5, a gyrokinetic particle-in-cell code. Numerical results are shown for linear electrostatic simulations with ORB5. The growth rate is found to be sensitively dependent on the phase-space shape of the distribution function. The qualitative behavior of the instability is analyzed theoretically through dispersion relations. Realistic neutral beam energetic particle anisotropic distributions are obtained from the Fokker-Planck solver RABBIT and are introduced into ORB5 as input distribution function. Results show a dependence of the growth rate on the beam injection angle. A preliminary qualitative comparison to experimental measurements is presented,the differences are discussed, and further steps for quantitative non-linear analysis are outlined