Phase-locking of magnetic islands diagnosed by ECE-imaging

Millimeter-wave imaging diagnostics identify phase-locking and the satisfaction of 3-wave coupling selection criteria among multiple magnetic island chains by providing a localized, internal measurement of the 2D power spectral density, S(ω, kpol). In high-confinement tokamak discharges, these inter...

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Bibliographic Details
Published in:Review of scientific instruments 2014-11, Vol.85 (11), p.11D847-11D847
Main Authors: Tobias, B, Grierson, B A, Muscatello, C M, Ren, X, Domier, C W, Luhmann, Jr, N C, Zemedkun, S E, Munsat, T L, Classen, I G J
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
magnetohydrodynamics (MHD)
tearing instability
tokamaks
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Summary:Millimeter-wave imaging diagnostics identify phase-locking and the satisfaction of 3-wave coupling selection criteria among multiple magnetic island chains by providing a localized, internal measurement of the 2D power spectral density, S(ω, kpol). In high-confinement tokamak discharges, these interactions impact both plasma rotation and tearing stability. Nonlinear coupling among neoclassical tearing modes of different n-number, with islands not satisfying the poloidal mode number selection criterion ⟨m, m('), m - m(')⟩, contributes to a reduction in core rotation and flow shear in the vicinity of the modes.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4892438