Modulation of core turbulent density fluctuations by large-scale neoclassical tearing mode islands in the DIII-D tokamak

Bardoczi, L.; Rhodes, T. L.; Carter, T. A.; Navarro, A. Banon; Peebles, W. A.; Jenko, F.; McKee, G.

doi:10.1103/PhysRevLett.116.215001

Title: Modulation of core turbulent density fluctuations by large-scale neoclassical tearing mode islands in the DIII-D tokamak

Journal Article · Thu May 26 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.116.215001· OSTI ID:1371729

Bardoczi, L. ^[1]; Rhodes, T. L. ^[1]; Carter, T. A. ^[1]; Navarro, A. Banon ^[1]; Peebles, W. A. ^[1]; Jenko, F. ^[1]; McKee, G. ^[2]

Univ. of California, Los Angeles, CA (United States)
Univ. of Wisconsin, Madison, WI (United States)

We report the first observation of localized modulation of turbulent density uctuations en (via Beam Emission Spectroscopy) by neoclassical tearing modes (NTMs) in the core of the DIII-D tokamak. NTMs are important as they often lead to severe degradation of plasma confinement and disruptions in high-confinement fusion experiments. Magnetic islands associated with NTMs significantly modify the profiles and turbulence drives. In this experiment n was found to be modulated by 14% across the island. Gyrokinetic simulations suggest that en could be dominantly driven by the ion temperature gradient (ITG) instability.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: University of California Los Angeles, Los Angeles, California 90095, USA University of Wisconsin-Madison, Madison, Wisconsin 53706, USA

Grant/Contract Number:: FC02-04ER54698; FG02-08ER54984; FG03-86ER53266; AC02-05CH11231

OSTI ID:: 1371729

Alternate ID(s):: OSTI ID: 1254539; OSTI ID: 1371728

Journal Information:: Physical Review Letters, Vol. 116, Issue 21; Related Information: L. Bardoczi, T.L. Rhode, T.A. Carter, A. Banon Navarro, W.A. Peebles, F. Jenko, and G. McKee "Modulation of Core Turbulent Density Fluctuations by Large-Scale Neoclassical Tearing ode Islands in the DIII-D Tokamak", Phys. Rev. Lets 116, 215001; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 55 works

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