Phys. Rev. Lett. 90, 185006 (2003) [4 pages]Zonal Flows and Transient Dynamics of the L-H TransitionReceived 24 January 2003; published 9 May 2003 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 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.185006
DOI:
10.1103/PhysRevLett.90.185006
PACS:
52.35.Ra, 05.45.–a, 52.25.Fi, 52.35.Kt
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