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P: Fachverband Plasmaphysik

P 5: Poster Session- Helmholtz Graduate School for Plasma Physics

P 5.18: Poster

Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof

Non-Maxwellian background effects in gyrokinetic simulations with GENE — •Alessandro Di Siena, Hauke Doerk, Tobias Görler, and Emanuele Poli — Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany

The interaction between fast alpha particles and core turbulence has been proven to be a central issue for a tokamak reactor. For instance, recent results predict a significant stabilization of electromagnetic turbulence in the presence of equivalent Maxwellian distributed fast ions. However, it's well known that to rigorously model fast particles, a non Maxwellian background distribution function is needed. With this aim, the gyrokinetic Vlasov and field equations in the gyrokinetic delta-f code GENE have been derived and implemented for a completely general background distribution function. First verfication studies will be shown, including linear electrostatic benchmarks for the ITG growth rates with GS2 and GKW using a slowing down distribution function for the alpha particles. Furthermore, low beta electromagnetic simulations are presented that are rarely - or not at all - found in the literature. These results are compared with those obtained using an equivalent Maxwellian for modelling the alpha particles.