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

Abstract

We report the first observation of localized modulation of turbulent density uctuations 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 significantly modify the profiles and turbulence drives. In this experiment n was found to be modulated by 14% across the island. Gyrokinetic simulations suggest that en 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:
Journal Article: 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. https://doi.org/10.1103/PhysRevLett.116.215001
Bardoczi, L., Rhodes, T. L., Carter, T. A., Navarro, A. Banon, Peebles, W. A., Jenko, F., and McKee, G. 2016. "Modulation of core turbulent density fluctuations by large-scale neoclassical tearing mode islands in the DIII-D tokamak". United States. https://doi.org/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 = {We report the first observation of localized modulation of turbulent density uctuations 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 significantly modify the profiles and turbulence drives. In this experiment n was found to be modulated by 14% across the island. Gyrokinetic simulations suggest that en could be dominantly driven by the ion temperature gradient (ITG) instability.},
doi = {10.1103/PhysRevLett.116.215001},
url = {https://www.osti.gov/biblio/1371729}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 21,
volume = 116,
place = {United States},
year = {Thu May 26 00:00:00 EDT 2016},
month = {Thu May 26 00:00:00 EDT 2016}
}

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Cited by: 55 works
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Works referenced in this record:

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Works referencing / citing this record:

Multi-field/-scale interactions of turbulence with neoclassical tearing mode magnetic islands in the DIII-D tokamak
journal, May 2017


Nonlinear dynamics of turbulence driven magnetic islands. II. Numerical simulations
journal, April 2017


Electron thermal confinement in a partially stochastic magnetic structure
journal, April 2018


Measurement of electron temperature fluctuations on J-TEXT via correlation ECE
journal, October 2018


Loss of bootstrap current in vicinity of magnetic islands
journal, May 2019


Effect of magnetic islands on profiles, flows, turbulence and transport in nonlinear gyrokinetic simulations
journal, February 2017


Internal transport barrier in tokamak and helical plasmas
journal, January 2018


Multi-scale interactions between turbulence and magnetic islands and parity mixture—a review
journal, March 2019


Interaction of magnetic islands with turbulent electron temperature fluctuations in DIII-D and in GENE nonlinear gyrokinetic simulations
journal, December 2019


Effects of magnetic islands on bootstrap current in toroidal plasmas
journal, December 2016


A novel approach to studying transport in plasmas with magnetic islands
journal, July 2018


Multi-scale interaction of pedestal instabilities in H-mode plasma on the EAST tokamak
journal, April 2019


Overview of HL-2A recent experiments
journal, July 2019