Self-sustained turbulence and H-mode confinement in toroidal plasmas

Sanae I. Itoh, Kimitaka Itoh, Masatoshi Yagi, Atsushi Fukuyama

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The method of self-sustained turbulence is applied to the tokamak plasma, incorporating the effect of an inhomogeneous radial electric field. The transport coefficient is derived, making a bridge between L- and H-phase plasmas. It is possible to construct a unified transport model of the L- and H-mode phases. The anomalous transport coefficients are obtained in a unified and explicit form in terms of profile parameters such as the plasma pressure gradient, the magnetic shear, the shear and curvature of the radial electric field. Strong reductions of the thermal conductivity, χ, the electron and ion viscosities, μe and μ, and the turbulent level in the H-phase plasma are explained. Furthermore, an additional stability window due to Er′ is discovered in the higher pressure-gradient regime. The anomalous ion viscosity determines Δ, the typical scale length or Er. Self-consistent solutions of Δ and μ are discussed.

Original languageEnglish
Pages (from-to)1743-1762
Number of pages20
JournalPlasma Physics and Controlled Fusion
Volume38
Issue number10
DOIs
Publication statusPublished - 1996

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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