[Table of Contents]

Plasma and Fusion Research

Volume 8, 1102168 (2013)

Review Articles

An Assessment of Limit Cycle Oscillation Dynamics Prior to L-H Transition
Kimitaka ITOH1,2), Sanae-I. ITOH2,3) and Akihide FUJISAWA2,3)
1)
National Institute for Fusion Science, Toki 509-5292, Japan
2)
Itoh Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan
3)
RIAM, Kyushu University, Kasuga 816-8580, Japan
(Received 27 August 2013 / Accepted 29 October 2013 / Published 27 December 2013)

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.

Keywords

LH-transition, limit cycle oscillation, zonal flow, electric field bifurcation

DOI: 10.1585/pfr.8.1102168

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This paper may be cited as follows:

Kimitaka ITOH, Sanae-I. ITOH and Akihide FUJISAWA, Plasma Fusion Res. 8, 1102168 (2013).