NIFS-457

FULL TEXT (PDF, 686 KB)


Author(s):

K. Itoh, S.- I. Itoh, A. Fukuyama and M. Yagi

Title:

Turbulent Transport and Structural Transition in Confined Plasmas

Date of publication:

Oct. 1996

Key words:

far-nonequilibrium system, turbulence, anomalous transport, gradient-flux relation, subcritical excitation, bifurcation, radial electric field, structural transition, entropy production rate, hysteresis

Abstract:

Theory of the far-nonequilibrium transport of plasmas is described. Analytic as well as simulation studies are developed. The suberitical 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 the collisional transport to the turbulent one is shown. The generation of the electric field and its influence on the turbulent transport are analyzed. The bifurcation of the radial electric field structure is addressed. The hysteresis appears in the flux-gradient relation. This bifurcation causes the multifold states in the plasma structure, driving the transition in transport coefficient or the self-generating oscillations in the flux. Structural formation and dynamics of plasma profiles are explained.

List of NIFS Report (1996)Return toContents Page Return toNIFS Homepage
footer
 National Institute for Fusion Science
Copyright: 1995-2007 National Institute for Fusion Science (NIFS)
Address: 322-6,Oroshi-cho, Toki, GIFU, 509-5292, Japan
Telephone:+81-572-58-2222