Comprehensive linear model for the n = m = 1 fishbone kinetic-MHD instability

A comprehensive linear model for the interaction between the MHD n = m = 1 internal kink and fast particles, based on the Hamiltonian angle-action formalism, is derived. On the basis of this model, a linear code, MHD-K, that solves partially analytically and numerically the kinetic-MHD dispersion re...

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Bibliographic Details
Published in:Journal of physics. Conference series 2018-11, Vol.1125 (1), p.12003
Main Authors: Brochard, G., Dümont, R., Garbet, X., Lutjens, H., Nicolas, T., Orain, F.
Format: Article
Language:English
Subjects:
Electrons
Physics
Plasma Physics
Stability
Trapped particles
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Summary:A comprehensive linear model for the interaction between the MHD n = m = 1 internal kink and fast particles, based on the Hamiltonian angle-action formalism, is derived. On the basis of this model, a linear code, MHD-K, that solves partially analytically and numerically the kinetic-MHD dispersion relation non-perturbatively is presented. The impact of passing fast particles on the fishbone is shown to be an essential drive of the instability, where previous models highlighted only trapped particles as the driver of the kinetic-MHD instability. Resonant planes in phase space are presented, showing multiple resonant branches for both trapped and passing particles.
ISSN:1742-6588
1742-6596
1742-6596
DOI:10.1088/1742-6596/1125/1/012003