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

doi:10.1103/PhysRevLett.116.215001

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

Research output: Contribution to journal › Article › peer-review

81 Scopus citations

Abstract

We report the first observation of localized modulation of turbulent density fluctuations ñ (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 ñ was found to be modulated by 14% across the island. Gyrokinetic simulations suggest that ñ could be dominantly driven by the ion temperature gradient instability.

Original language	English
Article number	215001
Journal	Physical Review Letters
Volume	116
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.116.215001
State	Published - May 26 2016
Externally published	Yes

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10.1103/PhysRevLett.116.215001

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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 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 island. Gyrokinetic simulations suggest that {\~n} could be dominantly driven by the ion temperature gradient instability.",

author = "L. Bard{\'o}czi and Rhodes, \{T. L.\} and Carter, \{T. A.\} and \{Ba{\~n}{\'o}n Navarro\}, A. and Peebles, \{W. A.\} and F. Jenko and G. McKee",

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doi = "10.1103/PhysRevLett.116.215001",

language = "English",

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T1 - Modulation of Core Turbulent Density Fluctuations by Large-Scale Neoclassical Tearing Mode Islands in the DIII-D Tokamak

AU - Bardóczi, L.

AU - Rhodes, T. L.

AU - Carter, T. A.

AU - Bañón Navarro, A.

AU - Peebles, W. A.

AU - Jenko, F.

AU - McKee, G.

PY - 2016/5/26

Y1 - 2016/5/26

N2 - We report the first observation of localized modulation of turbulent density fluctuations ñ (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 ñ was found to be modulated by 14% across the island. Gyrokinetic simulations suggest that ñ could be dominantly driven by the ion temperature gradient instability.

AB - We report the first observation of localized modulation of turbulent density fluctuations ñ (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 ñ was found to be modulated by 14% across the island. Gyrokinetic simulations suggest that ñ could be dominantly driven by the ion temperature gradient instability.

UR - https://www.scopus.com/pages/publications/84971320891

U2 - 10.1103/PhysRevLett.116.215001

DO - 10.1103/PhysRevLett.116.215001

M3 - Article

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SN - 0031-9007

VL - 116

JO - Physical Review Letters

JF - Physical Review Letters

IS - 21

M1 - 215001

ER -

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

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