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

L. Bardóczi, T. L. Rhodes, T. A. Carter, A. Bañón Navarro, W. A. Peebles, F. Jenko, G. McKee
2016 Physical Review Letters  
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 the
more » ... 14% across the island. Gyrokinetic simulations suggest that n could be dominantly driven by the ion temperature gradient (ITG) instability.
doi:10.1103/physrevlett.116.215001 pmid:27284662 fatcat:t672bjxuxfg4lezbagnqdxd6cy