An Assessment of Limit Cycle Oscillation Dynamics Prior to L-H Transition

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Author(s)

    • ITOH Kimitaka
    • National Institute for Fusion Science|Itoh Research Center for Plasma Turbulence, Kyushu University
    • ITOH Sanae-I.
    • Itoh Research Center for Plasma Turbulence, Kyushu University|RIAM, Kyushu University
    • FUJISAWA Akihide
    • Itoh Research Center for Plasma Turbulence, Kyushu University|RIAM, Kyushu University

Abstract

In this article, experimental observations of limit cycle oscillations (LCO) that precede L-to-H transition are discussed. Issues are: (1) the existence of zonal flows, (2) spatio-temporal evolutions of turbulence intensity, and (3) periodic generations/decays of mean radial electric field and density. The role of Reynolds stress to accelerate the LCO flow is also addressed. The propagation of changes of the density gradient and turbulence amplitude into the core is commented. Varieties in experimental reports on these issues are explained, and possible origins of different interpretations are discussed. Problem definitions for the future research for resolution are presented.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 8(0), 1102168-1102168, 2013

    The Japan Society of Plasma Science and Nuclear Fusion Research

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