Analysis of Turbulent Particle Fluxes in Reduced MHD Simulation

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  • TODOROKI Haruhiko
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • KASUYA Naohiro
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University Research Institute for Applied Mechanics, Kyushu University
  • YAGI Masatoshi
    National Institutes for Quantum Science and Technology

Description

<p>Some local turbulence analyses in tokamaks have shown that inward particle fluxes are induced in inversed density gradient regions. To evaluate the particle transport effect, we carry out global simulations using a 5-field reduced MHD model with an inversed density gradient near the plasma edge. Outward particle fluxes in the steeper gradient region are dominant, which mainly determine the evolution of the density profile. On the other hand, inward particle fluxes are also induced in the inversed gradient region. The electron drift modes are possible to become unstable with negative density gradients. The contribution of the inward particle fluxes is found to be present and its fraction is increased with nonlinear excitation of low n modes in the nonlinear phase, where n is the toroidal mode number.</p>

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 18 (0), 1203052-1203052, 2023-06-14

    The Japan Society of Plasma Science and Nuclear Fusion Research

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