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

Bardóczi, L.; Sung, C.; Navarro, A. Bañón; Rhodes, T. L.; Carter, T. A.; Jenko, F.

doi:10.1088/1361-6587/ab5c69

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

Journal Article · 15 December 2019 · Plasma Physics and Controlled Fusion

DOI: https://doi.org/10.1088/1361-6587/ab5c69 · OSTI ID:1608690

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General Atomics, San Diego, CA (United States); Univ. of California, Los Angeles, CA (United States); General Atomics, Energy & Advanced Concepts, DIII-D
Univ. of California, Los Angeles, CA (United States); Lam Research Corporation, Fremont, CA (United States)
Max Planck Inst. for Plasma Physics, Garching (Germany)
Univ. of California, Los Angeles, CA (United States)
Max Planck Inst. for Plasma Physics, Garching (Germany); Univ. of Texas, Austin, TX (United States)

We present localized measurements of interactions between neoclassical tearing modes (NTMs) and turbulent electron temperature fluctuations ($${\widetilde{{T}}}_{{\rm{e}}}$$) in the expected k_θρ_s = 0–0.5 wave-number range of the ion temperature gradient (ITG) instability measured via correlation electron cyclotron emission (k_θ and ρ_s 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 ρ_s, which is replicated by GENE through zonal flow damping due to the destroyed magnetic field topology of the NTM rational surface.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1608690

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 2 Vol. 62; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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