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Title: Interaction of magnetic islands with turbulent electron temperature fluctuations in DIII-D and in GENE nonlinear gyrokinetic simulations

Abstract

We present localized measurements of interactions between neoclassical tearing modes (NTMs) and turbulent electron temperature fluctuations ($${\widetilde{{T}}}_{{\rm{e}}}$$) in the expected kθρs = 0–0.5 wave-number range of the ion temperature gradient (ITG) instability measured via correlation electron cyclotron emission (kθ and ρs are the poloidal wave-number and ion-sound Larmor radius, respectively). Comparison to GENE gyrokinetic simulations, shows qualitative agreement with $${\widetilde{{T}}}_{{\rm{e}}}$$ being reduced (increased) inside (outside) of the islands due to modified local gradients, and $${\widetilde{{T}}}_{{\rm{e}}}$$ being higher (lower) in the region outside the island where lower (higher) flow shear is expected due to radially asymmetric island shape. These results are consistent with previously reported modifications of long and intermediate wavelength turbulent density fluctuations and cross-field electron thermal diffusivity reduction at the O-point of magnetic islands. Interestingly, a 30% increase of $${\widetilde{{T}}}_{{\rm{e}}}$$ is detected at the NTM rational surface when the island width is a few times ρs, which is replicated by GENE through zonal flow damping due to the destroyed magnetic field topology of the NTM rational surface.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5]
  1. General Atomics, San Diego, CA (United States); Univ. of California, Los Angeles, CA (United States)
  2. Univ. of California, Los Angeles, CA (United States); Lam Research Corporation, Fremont, CA (United States)
  3. Max Planck Inst. for Plasma Physics, Garching (Germany)
  4. Univ. of California, Los Angeles, CA (United States)
  5. Max Planck Inst. for Plasma Physics, Garching (Germany); Univ. of Texas, Austin, TX (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1608690
Grant/Contract Number:  
FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 62; Journal Issue: 2; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Bardóczi, L., Sung, C., Navarro, A. Bañón, Rhodes, T. L., Carter, T. A., and Jenko, F. Interaction of magnetic islands with turbulent electron temperature fluctuations in DIII-D and in GENE nonlinear gyrokinetic simulations. United States: N. p., 2019. Web. https://doi.org/10.1088/1361-6587/ab5c69.
Bardóczi, L., Sung, C., Navarro, A. Bañón, Rhodes, T. L., Carter, T. A., & Jenko, F. Interaction of magnetic islands with turbulent electron temperature fluctuations in DIII-D and in GENE nonlinear gyrokinetic simulations. United States. https://doi.org/10.1088/1361-6587/ab5c69
Bardóczi, L., Sung, C., Navarro, A. Bañón, Rhodes, T. L., Carter, T. A., and Jenko, F. Mon . "Interaction of magnetic islands with turbulent electron temperature fluctuations in DIII-D and in GENE nonlinear gyrokinetic simulations". United States. https://doi.org/10.1088/1361-6587/ab5c69. https://www.osti.gov/servlets/purl/1608690.
@article{osti_1608690,
title = {Interaction of magnetic islands with turbulent electron temperature fluctuations in DIII-D and in GENE nonlinear gyrokinetic simulations},
author = {Bardóczi, L. and Sung, C. and Navarro, A. Bañón and Rhodes, T. L. and Carter, T. A. and Jenko, F.},
abstractNote = {We present localized measurements of interactions between neoclassical tearing modes (NTMs) and turbulent electron temperature fluctuations (${\widetilde{{T}}}_{{\rm{e}}}$) in the expected kθρs = 0–0.5 wave-number range of the ion temperature gradient (ITG) instability measured via correlation electron cyclotron emission (kθ and ρs are the poloidal wave-number and ion-sound Larmor radius, respectively). Comparison to GENE gyrokinetic simulations, shows qualitative agreement with ${\widetilde{{T}}}_{{\rm{e}}}$ being reduced (increased) inside (outside) of the islands due to modified local gradients, and ${\widetilde{{T}}}_{{\rm{e}}}$ being higher (lower) in the region outside the island where lower (higher) flow shear is expected due to radially asymmetric island shape. These results are consistent with previously reported modifications of long and intermediate wavelength turbulent density fluctuations and cross-field electron thermal diffusivity reduction at the O-point of magnetic islands. Interestingly, a 30% increase of ${\widetilde{{T}}}_{{\rm{e}}}$ is detected at the NTM rational surface when the island width is a few times ρs, which is replicated by GENE through zonal flow damping due to the destroyed magnetic field topology of the NTM rational surface.},
doi = {10.1088/1361-6587/ab5c69},
journal = {Plasma Physics and Controlled Fusion},
number = 2,
volume = 62,
place = {United States},
year = {2019},
month = {12}
}

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