Kinetic Simulations of Neoclassical and Anomalous Transport Processes in Helical Systems

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著者

    • SUGAMA Hideo
    • National Institute for Fusion Science|The Graduate University for Advanced Studies (SOKENDAI)
    • WATANABE Tomohiko
    • National Institute for Fusion Science|The Graduate University for Advanced Studies (SOKENDAI)
    • NUNAMI Masanori
    • National Institute for Fusion Science|The Graduate University for Advanced Studies (SOKENDAI)
    • SATAKE Shinsuke
    • National Institute for Fusion Science|The Graduate University for Advanced Studies (SOKENDAI)

抄録

Drift kinetic and gyrokinetic theories and simulations are powerful means for quantitative predictions of neoclassical and anomalous transport fluxes in helical systems such as the Large Helical Device (LHD). The <i>δf </i>Monte Carlo particle simulation code, FORTEC-3D, is used to predict radial profiles of the neoclassical particle and heat transport fluxes and the radial electric field in helical systems. The radial electric field profiles in the LHD plasmas are calculated from the ambipolarity condition for the neoclassical particle fluxes obtained by the global simulations using the FORTEC-3D code, in which effects of ion or electron finite orbit widths are included. Gyrokinetic Vlasov simulations using the GKV code verify the theoretical prediction that the neoclassical optimization of helical magnetic configuration enhances the zonal flow generation which leads to the reduction of the turbulent heat diffusivity <i>χ</i><sub>i </sub>due to the ion temperature gradient (ITG) turbulence. Comparisons between results for the high ion temperature LHD experiment and the gyrokinetic simulations using the GKV-X code show that the <i>χ</i><sub>i </sub>profile and the poloidal wave number spectrum of the density fluctuation obtained from the simulations are in reasonable agreements with the experimental results. It is predicted theoretically and confirmed by the linear GKV simulations that the <b><i>E </i></b>× <b><i>B </i></b>rotation due to the background radial electric field <i>E</i><sub>r </sub>can enhance the zonal-flow response to a given source. Thus, in helical systems, the turbulent transport is linked to the neoclassical transport through <i>E</i><sub>r </sub>which is determined from the ambipolar condition for neoclassical particle fluxes and influences the zonal flow generation leading to reduction of the turbulent transport. In order to investigate the <i>E</i><sub>r </sub>effect on the regulation of the turbulent transport by the zonal flow generation, the flux-tube bundle model is proposed as a new method for multiscale gyrokinetic simulations.

収録刊行物

  • Plasma and Fusion Research

    Plasma and Fusion Research 7(0), 2403094-2403094, 2012

    プラズマ・核融合学会

各種コード

  • NII論文ID(NAID)
    130004467825
  • 本文言語コード
    ENG
  • 資料種別
    journal article
  • データ提供元
    IR  J-STAGE 
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