Zero-dimensional model for the critical condition for the L-H transition in the flux-gradient relation

S. I. Itoh, K. Itoh

研究成果: ジャーナルへの寄稿学術誌査読

3 被引用数 (Scopus)

抄録

In this paper, the physics of the L- to H-mode transition is discussed, focusing on the mechanism induced by the localized mean radial electric field. In addition to the neoclassical effect, an additional source of the electric field is introduced. The influence of turbulence-driven Reynolds stress is taken into account here. The case where the zonal flows are not excited is analysed. Even if the spontaneous zonal flows by turbulence cannot be excited, the bifurcation of the mean radial electric field can occur, if the electric field is strong enough eρpEr/Ti∼-1. Hard transition of the electric field takes place. The enhancement of electric field above this critical value can induce a bifurcation in the gradient-flux relation, i.e. the disappearance of the L-mode branch. The critical condition of the heat flux for the onset of transition is obtained.

本文言語英語
論文番号114017
ジャーナルNuclear Fusion
54
11
DOI
出版ステータス出版済み - 10月 1 2014

!!!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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