Zonal flows and transient dynamics of the L-H transition

Eun Jin Kim; P. H. Diamond

doi:10.1103/PhysRevLett.90.185006

Zonal flows and transient dynamics of the L-H transition

Eun Jin Kim, P. H. Diamond

University of California

Research output: Contribution to journal › Article › peer-review

184 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 language	English
Article number	185006
Number of pages	4
Journal	Physical Review Letters
Volume	90
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.90.185006
Publication status	Published - 9 May 2003
Externally published	Yes

Funding

PRLTAO 10.1103/PhysRevLett.77.3145 0031-9007 77 , 3145 ( 1996 ). We thank G. R. Tynan and C. Holland for a critical reading of the manuscript. This research was supported by U.S. DOE FG03-88ER 53275.

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.90.185006

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Zonal flows and transient dynamics of the L-H transition

Abstract

Funding

ASJC Scopus subject areas

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