Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
Review Articles
An Assessment of Limit Cycle Oscillation Dynamics Prior to L-H Transition
Kimitaka ITOHSanae-I. ITOHAkihide FUJISAWA
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2013 Volume 8 Pages 1102168

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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.

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© 2013 by The Japan Society of Plasma Science and Nuclear Fusion Research
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