Bremen 2017 – scientific programme
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P: Fachverband Plasmaphysik
P 6: Helmholtz Graduate School I
P 6.14: Poster
Monday, March 13, 2017, 16:30–18:30, HS Foyer
Non-Maxwellian fast particle effects in gyrokinetic GENE simulations — •Alessandro Di Siena1, Tobias Goerler1, Hauke Doerk1, Jonathan Citrin2,3, Thomas Johnson4, Mireille Schneider3, and Emanuele Poli1 — 1Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany — 2FOM Institute DIFFER, PO Box 6336, 5600 HH Eindhoven, The Netherlands — 3CEA, IRFM, F-13108 Saint Paul Lez Durance, France — 4VR Association, EES, KTH, Stockholm, Sweden
The understanding of the stabilising mechanism of fast particles on the main plasma turbulence is an essential task for a future fusion reactor, where the energetic particles can constitute a significant fraction of the main ions. While the consideration of equivalent Maxwellian distributed fast ions in the simulations has greatly improved the agreement with the experiment, the fast ion electromagnetic stabilization seems to be somewhat overestimated. However, it is well known that to rigorously model highly non thermalised particles, a non-Maxwellian background distribution function is needed. To this aim, a previous study on a particular JET plasma has been revised and analysed with the gyrokinetic code GENE. In order to study the impact of non-Maxwellian distribution functions on the plasma turbulence, the fast particle distributions have been modelled with a number of different analytic choices, as well as numerical distributions imported from the modelling tools NEMO/SPOT and SELFO. The analytical distributions best approximating the numerical ones are identified and linear and nonlinear results are shown.