title: Phase-locking of magnetic islands diagnosed by ECE-imaging.
abstract: 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.
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: B
authors.initials: B
authors.lastname: Tobias
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: B A
authors.initials: BA
authors.lastname: Grierson
authors.affiliation: Department of Electrical and Computer Engineering, Universtiy of California at Davis, Davis, California 95616, USA.
authors.forename: C M
authors.initials: CM
authors.lastname: Muscatello
authors.affiliation: Department of Electrical and Computer Engineering, Universtiy of California at Davis, Davis, California 95616, USA.
authors.forename: X
authors.initials: X
authors.lastname: Ren
authors.affiliation: Department of Electrical and Computer Engineering, Universtiy of California at Davis, Davis, California 95616, USA.
authors.forename: C W
authors.initials: CW
authors.lastname: Domier
authors.affiliation: Department of Electrical and Computer Engineering, Universtiy of California at Davis, Davis, California 95616, USA.
authors.forename: N C
authors.initials: NC
authors.lastname: Luhmann
authors.affiliation: Department of Electrical and Computer Engineering, University of Colorado at Boulder, Boulder, Colorado 80309, USA.
authors.forename: S E
authors.initials: SE
authors.lastname: Zemedkun
authors.affiliation: Department of Electrical and Computer Engineering, University of Colorado at Boulder, Boulder, Colorado 80309, USA.
authors.forename: T L
authors.initials: TL
authors.lastname: Munsat
authors.affiliation: Dutch Institute for Fundamental Energy Research-DIFFER, 3430 BE Nieuwegein, The Netherlands.
authors.forename: I G J
authors.initials: IG
authors.lastname: Classen