Phase-locking of magnetic islands diagnosed by ECE-imaging

Tobias, Benjamin; Grierson, Brian A.; Muscatello, Christopher M.; Ren, Xiaoxin; Domier, C. W.; Luhmann, Neville C.; Zemedkun, Samuel E.; Munsat, Tobin L.; Classen, I. G. J.

doi:10.1063/1.4892438

Phase-locking of magnetic islands diagnosed by ECE-imaging

Journal Article · Wed Aug 13 00:00:00 EDT 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4892438· OSTI ID:1172887

Tobias, Benjamin ^[1]; Grierson, Brian A. ^[1]; Muscatello, Christopher M. ^[2]; Ren, Xiaoxin ^[2]; Domier, C. W. ^[2]; Luhmann, Neville C. ^[2]; Zemedkun, Samuel E. ^[3]; Munsat, Tobin L. ^[3]; Classen, I. G. J. ^[4]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California, Davis, CA (United States)
Univ. of Colorado, Boulder, CO (United States)
Dutch Inst. for Fundamental Energy Research (Netherlands)

Millimeter-wave imaging diagnostics identify phase-locking and the satisfaction of 3-wave coupling selection criteria amongst multiple magnetic island chains by providing a localized, internal measurement of the 2D power spectral density, S(ω, k_pol). In high-confinement tokamak discharges, these interactions impact both plasma rotation and tearing stability. Here, nonlinear coupling amongst neoclassical tearing modes (NTMs) 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.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, La Jolla, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698

OSTI ID:: 1172887

Alternate ID(s):: OSTI ID: 1367160

Report Number(s):: PPPL--5047

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 85; ISSN 0034-6748; ISSN RSINAK

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

Phase locking of multi-helicity neoclassical tearing modes in tokamak plasmas Fitzpatrick, Richard Physics of Plasmas, Vol. 22, Issue 4 https://doi.org/10.1063/1.4919030	journal	April 2015
Non-perturbative measurement of cross-field thermal diffusivity reduction at the O-point of 2/1 neoclassical tearing mode islands in the DIII-D tokamak Bardóczi, L.; Rhodes, T. L.; Carter, T. A. Physics of Plasmas, Vol. 23, Issue 5 https://doi.org/10.1063/1.4948560	journal	May 2016
Electron cyclotron emission based q -profile measurement and concept for equilibrium reconstruction Nelson, A. O.; Austin, M. E.; Kolemen, E. Plasma Physics and Controlled Fusion, Vol. 61, Issue 8 https://doi.org/10.1088/1361-6587/ab24a4	journal	June 2019

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