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- W3135657899 abstract "This paper presents a study of the interaction between Alfv'en modes and zonal structures, considering a realistic ASDEX Upgrade equilibrium. The results of gyrokinetic simulations with the global, electromagnetic, particle-in-cell code ORB5 are presented, where the modes are driven unstable by energetic particles with a bump-on-tail equilibrium distribution function, with radial density gradient. Two regimes have been observed: at low energetic particles concentration, the Alfv'en mode saturates at much higher level in presence of zonal structures; on the other hand at high energetic particles concentration the difference is less pronounced. The former regime is characterized by the zonal structure (identified as an energetic particle driven geodesic acoustic mode), being more unstable than the Alfv'en mode. In the latter regime the Alfv'en mode is more unstable than the zonal structure. The theoretical explanation is given in terms of a 3-wave coupling of the energetic particle driven geodesic acoustic mode and Alfv'en mode, mediated by the curvature-pressure coupling term of the energetic particles." @default.
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- W3135657899 date "2021-03-05" @default.
- W3135657899 modified "2023-09-26" @default.
- W3135657899 title "Gyrokinetic investigation of the nonlinear interaction of Alfv'en instabilities and energetic-particle driven geodesic acoustic modes" @default.
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- W3135657899 doi "https://doi.org/10.48550/arxiv.2103.03915" @default.
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