Self-Regulating Shear Flow Turbulence: A Paradigm for the L to H Transition

P. H. Diamond, Y.-M. Liang, B. A. Carreras, and P. W. Terry
Phys. Rev. Lett. 72, 2565 – Published 18 April 1994
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Abstract

A self-consistent model of the L to H transition is derived from coupled nonlinear envelope equations for the fluctuation level and radial electric field shear Er. These equations exhibit a supercritical bifurcation between dual L-mode and H-mode fixed points. The transition occurs when the turbulence level is large enough for the Reynolds stress drive to overcome the damping of the E×B flow. This defines a power threshold for the transition, which is calculated and found to be consistent with experimental findings.

  • Received 23 July 1993

DOI:https://doi.org/10.1103/PhysRevLett.72.2565

©1994 American Physical Society

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Vol. 72, Iss. 16 — 18 April 1994

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