2003
DOI: 10.1103/physrevlett.90.185006
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Zonal Flows and Transient Dynamics of theLHTransition

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 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 ultimat… Show more

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Cited by 285 publications
(395 citation statements)
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“…This is consistent with the theoretical prediction of nonlinear interaction of drift wave turbulence [18]. Structural transition in turbulent plasmas has been known [1,7], and a new type of it has been pointed out by introducing the coupling between micro, meso and macro perturbations [33,34].…”
Section: Measurement Of Nonlinear Interactionsupporting
confidence: 74%
“…This is consistent with the theoretical prediction of nonlinear interaction of drift wave turbulence [18]. Structural transition in turbulent plasmas has been known [1,7], and a new type of it has been pointed out by introducing the coupling between micro, meso and macro perturbations [33,34].…”
Section: Measurement Of Nonlinear Interactionsupporting
confidence: 74%
“…Moreover, since mean flows can be driven by both heating/fueling ͑via ٌP͒ and turbulence, while zonal flows are exclusively turbulencedriven, nontrivial energy exchange cycles are possible involving the interplay of zonal and mean flows. 19 Even when the turbulence interaction with the mean E ϫ B shearing is weaker than its interaction with the zonal E ϫ B shearing, the long time contribution to turbulence from mean E ϫ B shearing could be significant. Breaking the large scale eddies into small scale turbulence by shearing usually results in the quench of the turbulence drive process and the reduction of plasma transport.…”
Section: Properties Of a Full-f Particle Simulationmentioning
confidence: 99%
“…Apart from the obvious shortcoming of reducing the spectrum to two modes, its mode coupling description is heuristic, it does not explicitly address any role played by the m ¼ 0 coupling intermediary, 19 it does not account for mode structure beyond the boundary layer effect of the shear suppression theory, 11 and does not account for 3D effects or toroidal geometry. Despite its shortcomings, it falls within the performance norms of predator-prey models used for characterizing H-mode transitions 20,21 and internal transport barrier dynamics. 22 …”
Section: Basic Dynamical Modelmentioning
confidence: 99%