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We report the first observation of localized modulation of turbulent density fluctuations n (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 thedoi:10.1103/physrevlett.116.215001 pmid:27284662 fatcat:t672bjxuxfg4lezbagnqdxd6cy