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Modulation of Core Turbulent Density Fluctuations by Large-Scale Neoclassical Tearing Mode Islands in the DIII-D Tokamak

We report the first observation of localized modulation of turbulent density fluctuations n[over ˜] (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 disruptio...

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Bibliographic Details
Published in:Physical review letters 2016-05, Vol.116 (21), p.215001-215001, Article 215001
Main Authors: Bardóczi, L, Rhodes, T L, Carter, T A, Bañón Navarro, A, Peebles, W A, Jenko, F, McKee, G
Format: Article
Language:English
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Summary:We report the first observation of localized modulation of turbulent density fluctuations n[over ˜] (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[over ˜] was found to be modulated by 14% across the island. Gyrokinetic simulations suggest that n[over ˜] could be dominantly driven by the ion temperature gradient instability.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.116.215001