Shear Alfvén waves within magnetic islands

We calculate Alfvén eigenmodes within a magnetic island (MiAE) which have been conjectured over a decade ago. Starting from a cylindrical plasma equilibrium, we calculate the complete metric of the island interior assuming an iota profile with a constant shear for Wendelstein 7-X parameters. Then, w...

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Bibliographic Details
Published in:Nuclear fusion 2024-05, Vol.64 (5), p.54001
Main Authors: Könies, Axel, Cao, Jinjia, Kleiber, Ralf
Format: Article
Language:English
Subjects:
magnetic confinement fusion
magnetohydrodynamics
plasma stability
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Summary:We calculate Alfvén eigenmodes within a magnetic island (MiAE) which have been conjectured over a decade ago. Starting from a cylindrical plasma equilibrium, we calculate the complete metric of the island interior assuming an iota profile with a constant shear for Wendelstein 7-X parameters. Then, we solve the resulting Magneto-Hydrodynamic equations inside the island optionally considering Finite Larmor Radius corrections. We find various eigenmodes in the lowest gaps for n  = 0. The eigenmode with the lowest frequency shows a weakly non-linear dependence on the island width which deviates considerably from an earlier estimate.
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/ad34e2