Impact of resonant magnetic perturbations on zonal flows and microturbulence

Z. R. Williams, M. J. Pueschel, P. W. Terry, T. Nishizawa, D. M. Kriete, M. D. Nornberg, J. S. Sarff, G. R. McKee, D. M. Orlov, S. H. Nogami

研究成果: ジャーナルへの寄稿学術誌査読

9 被引用数 (Scopus)

抄録

Results from a joint experimental and computational effort studying the effect of resonant magnetic perturbations (RMPs) on microturbulence levels and their connection to zonal flows in the DIII-D tokamak L-mode are presented. Beam emission spectroscopy measurements show a direct increase in density fluctuations at microturbulent scales with increasing RMP amplitude, suggesting that magnetic activity introduced by the RMP affects the regulation of microturbulence on DIII-D. This is analogous to how MHD-scale magnetic fluctuations arising from tearing modes have been observed in simulations to increase microturbulence levels in the reversed-field pinch (RFP). In the RFP, this is attributed to magnetic fluctuations eroding turbulence-limiting zonal flows; this work examines if a similar mechanism is present for DIII-D microturbulence. Gyrokinetic simulations find that the application of an RMP corresponds directly to a decrease in zonal flow levels, producing a similar increase of turbulent fluctuation levels over a range of RMP amplitudes as observed in the experiment.

本文言語英語
論文番号096004
ジャーナルNuclear Fusion
60
9
DOI
出版ステータス出版済み - 9月 2020
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学
  • 凝縮系物理学

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