Zonal flow dynamics and anomalous transport

White, Roscoe; Chen, Liu; Zonca, Fulvio

doi:10.1063/1.1898225

Zonal flow dynamics and anomalous transport

Journal Article · Mon May 02 00:00:00 EDT 2005 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.1898225· OSTI ID:1130340

White, Roscoe ^[1]; Chen, Liu ^[2]; Zonca, Fulvio ^[3]

Princeton University Plasma Physics Laboratory, , P.O. Box 451, Princeton, New Jersey 08543; University of California, Irvine
University of California Department of Physics and Astronomy, , Irvine, California 92697-4575 and Department of Physics, , Hangzhou, China; Zhejiang University Department of Physics and Astronomy, , Irvine, California 92697-4575 and Department of Physics, , Hangzhou, China
Associazione Euratom-ENEA sulla fusione , CR Frascati, Casella Postale 65-00044, Frascati, Italy

Nonlinear equations for the slow space-time evolution of the radial drift wave-ion-temperature gradient (DW-ITG) envelope and zonal flow (ZF) amplitude have been derived within a coherent four-wave drift wave-zonal flow model. In the local limit this model demonstrates spontaneous generation of zonal flow and nonlinear drift wave-zonal flow dynamics in toroidal plasmas. The model allows slow temporal and spatial variations of the DW-ITG radial envelope, incorporating the effects of equilibrium variations, i.e., turbulence spreading and size dependence of the saturated wave intensities and transport coefficients. The competition between linear drive/damping and drift wave spreading due to linear and nonlinear group velocities and nonlinear energy transfer between DW and ZF determines the saturation levels of the fluctuating fields. The turbulence intensity level exhibits a transition from Bohm scaling at small system size (Lp∕ρi) to gyro-Bohm for large system size. This system exhibits chaotic behavior and intermittency, depending on system size and proximity to marginal stability.

Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: Princeton Plasma Physics Laboratory; ENEA, Frascati, Italy

DOE Contract Number:: FG02-04ER54736

OSTI ID:: 1130340

Report Number(s):: DOE-UCI-ER54736

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 12; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

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