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- W4380084799 abstract "We propose a theoretical scheme for the study of the nonlinear interaction of drift-wave-like turbulence and energetic particles in stellarators. The approach is based on gyrokinetics, and features a separation of time and scales, for electromagnetic fluctuations, inspired by linear ballooning theory. Two specific moments of the gyrokinetic equation constitute the main equations of the system, which requires a full kinetic nonlinear solution. This is found iteratively, expanding in the smallness of the bounce-average radial drift frequency, and nonlinear $boldsymbol {E}times boldsymbol {B}$ drift frequency, compared with the inverse time scales of the resonantly interacting energetic particles. Our analysis is therefore valid for neoclassically optimised stellators. The resummation of all iterative and perturbative nonlinear kinetic solutions is discussed in terms of Feynman diagrams. Particular emphasis is put on the role of collisionlessly undamped large-scale structures in phase space, the kinetic equivalent of zonal flows, i.e. phase-space zonal structures, and on wave-like fluctuations generated by energetic particles." @default.
- W4380084799 created "2023-06-10" @default.
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- W4380084799 date "2023-06-01" @default.
- W4380084799 modified "2023-09-27" @default.
- W4380084799 title "Nonlinear drift-wave and energetic particle long-time behaviour in stellarators: solution of the kinetic problem" @default.
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- W4380084799 doi "https://doi.org/10.1017/s002237782300048x" @default.
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