Spatiotemporal structures of edge limit-cycle oscillation before L-to-H transition in the JFT-2M tokamak

In this Letter, we report analyses of spatiotemporal dynamics of turbulence and structure in the limit-cycle oscillation (LCO) that precedes an L-to-H transition. Zonal flows are not observed during LCO, and the oscillation is the periodic generations or decays of barrier with edge-localized mean fl...

Full description

Saved in:
Bibliographic Details
Published inPhysical review letters Vol. 111; no. 3; p. 035002
Main Authors Kobayashi, T, Itoh, K, Ido, T, Kamiya, K, Itoh, S-I, Miura, Y, Nagashima, Y, Fujisawa, A, Inagaki, S, Ida, K, Hoshino, K
Format Journal Article
LanguageEnglish
Published United States 17.07.2013
Online AccessGet more information

Cover

More Information
Summary:In this Letter, we report analyses of spatiotemporal dynamics of turbulence and structure in the limit-cycle oscillation (LCO) that precedes an L-to-H transition. Zonal flows are not observed during LCO, and the oscillation is the periodic generations or decays of barrier with edge-localized mean flow. Oscillatory Reynolds stress is found to be too small to accelerate the LCO flow, by considering the dielectric constant in magnetized toroidal plasmas. Propagation of changes of the density gradient and turbulence amplitude into the core is also observed.
ISSN:1079-7114
DOI:10.1103/physrevlett.111.035002