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

Sanae Itoh, Kimitaka Itoh, Masatoshi Yagi, Atsushi Fukuyama

Research output: Contribution to journalArticle

15 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 - Dec 1 1996

Fingerprint

Plasma confinement
toroidal plasmas
Turbulence
turbulence
Plasmas
pressure gradients
transport properties
Pressure gradient
viscosity
shear
plasma pressure
electric fields
Electric fields
Viscosity
Ions
ions
thermal conductivity
curvature
Thermal conductivity
profiles

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Self-sustained turbulence and H-mode confinement in toroidal plasmas. / Itoh, Sanae; Itoh, Kimitaka; Yagi, Masatoshi; Fukuyama, Atsushi.

In: Plasma Physics and Controlled Fusion, Vol. 38, No. 10, 01.12.1996, p. 1743-1762.

Research output: Contribution to journalArticle

Itoh, Sanae ; Itoh, Kimitaka ; Yagi, Masatoshi ; Fukuyama, Atsushi. / Self-sustained turbulence and H-mode confinement in toroidal plasmas. In: Plasma Physics and Controlled Fusion. 1996 ; Vol. 38, No. 10. pp. 1743-1762.
@article{497cadc06c3b4f459d8642c975cd2ccf,
title = "Self-sustained turbulence and H-mode confinement in toroidal plasmas",
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.",
author = "Sanae Itoh and Kimitaka Itoh and Masatoshi Yagi and Atsushi Fukuyama",
year = "1996",
month = "12",
day = "1",
doi = "10.1088/0741-3335/38/10/004",
language = "English",
volume = "38",
pages = "1743--1762",
journal = "Plasma Physics and Controlled Fusion",
issn = "0741-3335",
publisher = "IOP Publishing Ltd.",
number = "10",

}

TY - JOUR

T1 - Self-sustained turbulence and H-mode confinement in toroidal plasmas

AU - Itoh, Sanae

AU - Itoh, Kimitaka

AU - Yagi, Masatoshi

AU - Fukuyama, Atsushi

PY - 1996/12/1

Y1 - 1996/12/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0030257280&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030257280&partnerID=8YFLogxK

U2 - 10.1088/0741-3335/38/10/004

DO - 10.1088/0741-3335/38/10/004

M3 - Article

AN - SCOPUS:0030257280

VL - 38

SP - 1743

EP - 1762

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 10

ER -