Zonal flows and transient dynamics of the L-H transition -: art. no. 185006

被引：273

作者：

Kim, EJ ^{[1
]}

Diamond, PH ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.90.185006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 ExB flows, and the ion pressure gradient. Zonal flows are shown to trigger the L-H transition and cause time-transient 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.

引用

页数：4

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