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Zonal flow excitation in plasmas by electron-temperature-gradient modes

Published online by Cambridge University Press:  19 January 2004

P. K. SHUKLA and
L. STENFLO
P. K. SHUKLA
Affiliation:
Institut für Theoretische Physik IV, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, GermanyAlso at the Department of Plasma Physics, Umeå University, SE-90187 Umeå, Sweden, and the Centre for Interdisciplinary Plasma Science at the Max-Planck Institut für Extraterrestrische Physik und Plasmaphysik, D-85740 Garching, Germany.
L. STENFLO
Affiliation:
Department of Plasma Physics, Umeå University, SE-90187 Umeå, Sweden
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Abstract

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The nonlinear coupling between short-wavelength electron-temperature-gradient (ETG) modes and zonal flows in plasmas is considered. The mode-coupling equations are derived by using a Boltzmann ion distribution and a fluid electron response described by the hydrodynamic and energy equations. A dispersion relation for the nonlinearly coupled ETG modes and the zonal flows is derived. The results show enhanced zonal flows, which can affect the electron energy transport in tokamaks and stellarators.

Information

Type
Papers
Information
Journal of Plasma Physics , Volume 70 , Issue 1 , February 2004, pp. 41 - 46
Copyright
2004 Cambridge University Press