Turbulent transport and structural transition in confined plasmas

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

doi:10.1088/0741-3335/39/5A/028

Turbulent transport and structural transition in confined plasmas

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

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

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Abstract

The theory of far-nonequilibrium transport of plasmas is described. Analytic as well as simulation studies are developed. The subcritical nature of turbulence and the mechanism for self-sustaining are discussed. The transport coefficient is obtained. The pressure gradient is introduced as an order parameter, and the bifurcation from collisional to turbulent transport is shown. The generation of the electric field and its influence on the turbulent transport are analysed. The bifurcation of the radial electric field structure is addressed. Hysteresis appears in the flux-gradient relation. This bifurcation causes the multifold states in the plasma structure, driving the transition in the transport coefficient or the self-generating oscillations in the flux. The structural formation and dynamics of plasma profiles are explained.

Original language	English
Pages (from-to)	A311-A322
Journal	Plasma Physics and Controlled Fusion
Volume	39
Issue number	5A
DOIs	https://doi.org/10.1088/0741-3335/39/5A/028
Publication status	Published - 1997

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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T1 - Turbulent transport and structural transition in confined plasmas

AU - Itoh, Kimitaka

AU - Itoh, Sanae I.

AU - Fukuyama, Atsushi

AU - Yagi, Masatoshi

PY - 1997

Y1 - 1997

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AB - The theory of far-nonequilibrium transport of plasmas is described. Analytic as well as simulation studies are developed. The subcritical nature of turbulence and the mechanism for self-sustaining are discussed. The transport coefficient is obtained. The pressure gradient is introduced as an order parameter, and the bifurcation from collisional to turbulent transport is shown. The generation of the electric field and its influence on the turbulent transport are analysed. The bifurcation of the radial electric field structure is addressed. Hysteresis appears in the flux-gradient relation. This bifurcation causes the multifold states in the plasma structure, driving the transition in the transport coefficient or the self-generating oscillations in the flux. The structural formation and dynamics of plasma profiles are explained.

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SN - 0741-3335

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Turbulent transport and structural transition in confined plasmas

Abstract

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