論文

査読有り
2022年7月1日

Nonlinear functional relation covering near- and far-marginal stability in ion temperature gradient driven turbulence

Plasma Physics and Controlled Fusion
  • T Nakayama
  • ,
  • M Nakata
  • ,
  • M Honda
  • ,
  • M Nunami
  • ,
  • S Matsuoka

64
7
開始ページ
075007
終了ページ
075007
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1088/1361-6587/ac6ffc
出版者・発行元
IOP Publishing

Abstract

A novel nonlinear functional relation of turbulence potential intensity, zonal flow potential intensity, and ion thermal diffusivity that accurately reproduces nonlinear gyrokinetic simulations of toroidal ion temperature gradient (ITG) driven turbulence is proposed. Applying mathematical optimization techniques to find extremal solutions in high-dimensional parameter space, the optimal regression parameters in the functional form are determined to be valid for both near- and far-marginal regime of the ITG stability including the Dimits-shift. Then, the regression error of ∼5% is accomplished. In addition, it is clarified that the intensity ratio of the zonal flow and turbulence potential intensity is a crucial factor to determine the reproduction accuracy.

リンク情報
DOI
https://doi.org/10.1088/1361-6587/ac6ffc
URL
https://iopscience.iop.org/article/10.1088/1361-6587/ac6ffc
URL
https://iopscience.iop.org/article/10.1088/1361-6587/ac6ffc/pdf
ID情報
  • DOI : 10.1088/1361-6587/ac6ffc
  • ISSN : 0741-3335
  • eISSN : 1361-6587

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