NIFS-786

FULL TEXT (PDF, 351 KB)

Author(s):

K. Itoh, K. Hallatschek, S. Toda, H. Sanuki and S.-I. Itoh

Title:

Coherent Structure of Zonal Flow and Nonlinear Saturation

Date of publication:

Dec. 2003

Key words:

zonal flow, plasma turbulence, collisionless saturation, coherent structure, wave kinetic equation

Abstract:

Nonlinear structure of the zonal flow in toroidal plasma is investigated. It is found that the turbulent drive of zonal flow starts to decrease at high velocity shear of zonal flow. By this mechanism, the zonal flow evolves into a stable stationary structure in turbulent plasmas. Flow velocity and radial scale length are obtained. Analytic model explains simulational observations.

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