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Coherent drift-wave structures in toroidal plasmas

Published online by Cambridge University Press:  13 March 2009

W. Horton ,
T. Tajima ,
J.-Y. Kim ,
Y. Kishimoto  and
M. Ottaviani
W. Horton
Affiliation:
Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA
T. Tajima
Affiliation:
Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA
J.-Y. Kim
Affiliation:
Naka Fusion Research Establishment Japan Atomic Energy Research institute Naka, Ibaraki 311-01, Japan
Y. Kishimoto
Affiliation:
Naka Fusion Research Establishment Japan Atomic Energy Research institute Naka, Ibaraki 311-01, Japan
M. Ottaviani
Affiliation:
JET Joint Undertaking, Abingdon, Oxon, OX14 3EA, UK
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Abstract

Using the ion-temperature-gradient-driven drift waves as a paradigm for drift-wave anomalous transport, we explore the structure of the linear and nonlinear modes. Two phases of transport are shown to exist: (i) Bohm-like transport for parameters close to marginal stability; (ii) gyro-Bohm transport for turbulent convection cells in systems driven away from marginal stability. Nonlinear relaxation to large-scale coherent convective structures is observed in three-dimensional toroidal particle simulations.

Type
Research Article
Information
Journal of Plasma Physics , Volume 56 , Issue 3: Special Issue: Honour of David Montgomery , December 1996 , pp. 605 - 613
Copyright
Copyright © Cambridge University Press 1996

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