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

Here, we report the first observation of localized modulation of turbulent density fluctuations 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 signi cantly modify the profiles and turbulence drives. In this experiment n was found to be modulated by 14% across the island. Gyrokinetic simulations suggest that n could be dominantly driven by the ion temperature gradient (ITG) instability.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Grant/Contract Number:
FC02-04ER54698
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal 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; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
University of California Los Angeles, Los Angeles, California 90095, USA University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1371729
Alternate Identifier(s):
OSTI ID: 1371729