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Author(s):
K. Itoh, K. Hallatschek, S.-I Itoh, P.H. Dianmond, S. Toda
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Title:
Coherent Structure of Zonal Flow and Onset of Turbulent Transport
Date of publication:
Feb. 2005
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Key words:
zonal flow, drift wave turbulence, anomalous transport, nonlinear saruration, partition of energy, coherent structure, upshift of turbulence threshold
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Abstract:
Excitation of the turbulence in the range of drift wave frequency and zonal flow in magnetized plasmas is analyzed. Nonlinear stabilization effect on zonal flow drive is introduced, and the steady state solution is obtained. The condition for the onset of turbulent transport is obtained and partition ratio of fluctuation energy into turbulence and zonal flows is derived. The turbulent transport coefficient, which includes the effect of zonal flow, is also obtained. Analytic result and direct numerical simulation show a good agreement
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