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

Abstract

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:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
University of California Los Angeles, Los Angeles, California 90095, USA University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
OSTI Identifier:
1371729
Alternate Identifier(s):
OSTI ID: 1254539; OSTI ID: 1371728
Grant/Contract Number:  
FC02-04ER54698; FG02-08ER54984; FG03-86ER53266; AC02-05CH11231
Resource 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)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Bardoczi, L., Rhodes, T. L., Carter, T. A., Navarro, A. Banon, Peebles, W. A., Jenko, F., and McKee, G. Modulation of core turbulent density fluctuations by large-scale neoclassical tearing mode islands in the DIII-D tokamak. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.116.215001.
Bardoczi, L., Rhodes, T. L., Carter, T. A., Navarro, A. Banon, Peebles, W. A., Jenko, F., & McKee, G. Modulation of core turbulent density fluctuations by large-scale neoclassical tearing mode islands in the DIII-D tokamak. United States. doi:10.1103/PhysRevLett.116.215001.
Bardoczi, L., Rhodes, T. L., Carter, T. A., Navarro, A. Banon, Peebles, W. A., Jenko, F., and McKee, G. Thu . "Modulation of core turbulent density fluctuations by large-scale neoclassical tearing mode islands in the DIII-D tokamak". United States. doi:10.1103/PhysRevLett.116.215001. https://www.osti.gov/servlets/purl/1371729.
@article{osti_1371729,
title = {Modulation of core turbulent density fluctuations by large-scale neoclassical tearing mode islands in the DIII-D tokamak},
author = {Bardoczi, L. and Rhodes, T. L. and Carter, T. A. and Navarro, A. Banon and Peebles, W. A. and Jenko, F. and McKee, G.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.116.215001},
journal = {Physical Review Letters},
number = 21,
volume = 116,
place = {United States},
year = {2016},
month = {5}
}

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Free Publicly Available Full Text
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Cited by: 14 works
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