Zonal flows and transient dynamics of the L-H transition

Eun Jin Kim, P. H. Diamond

Research output: Contribution to journalArticle

166 Citations (Scopus)

Abstract

We elucidate the role of zonal flows in transient phenomena observed during L-H transition by studying a simple L-H transition model which contains the evolution of zonal flows, mean E B flows, and the ion pressure gradient. Zonal flows are shown to trigger the L-H transition and cause timetransient behavior through the self-regulation of turbulence before a mean shearing, due to a steep pressure profile, secures a quiescent H mode. Surprisingly, this self-regulation lowers the power threshold for the ultimate transition to a quiescent H-mode state.

Original languageEnglish
Article number185006
Number of pages4
JournalPhysical Review Letters
Volume90
Issue number18
DOIs
Publication statusPublished - 9 May 2003
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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