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Collisionless trapped-electron-mode turbulence and transport in fluid descriptions

Published online by Cambridge University Press:  01 October 2007

H. NORDMAN ,
P. STRAND  and
X. GARBET
H. NORDMAN
Affiliation:
Department of Radio and Space Science, Chalmers University of Technology, Euratom-VR Association, SE-412 96 Göteborg, Sweden (elfhn@chalmers.se)
P. STRAND
Affiliation:
Department of Radio and Space Science, Chalmers University of Technology, Euratom-VR Association, SE-412 96 Göteborg, Sweden (elfhn@chalmers.se)
X. GARBET
Affiliation:
Association Euratom-CEA, CEA/DSM/DRFC CEA-Cadarache, France
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Abstract

A study of particle and electron heat transport in tokamaks due to trapped-electron-mode (TEM) turbulence is presented. The study is based on the Weiland fluid model for ion-temperature-gradient (ITG) modes and TEMs, complemented and compared with a trapped electron fluid treatment which retains contributions from the weakly trapped electrons. The dependence of the fluid transport coefficients on magnetic shear and other plasma parameters is discussed and compared with results obtained from nonlinear gyrokinetic simulations. Inward (pinch) flows of particles and heat, previously reported for the coupled ITG–TEM system, are also found in the TEM dominated regime.

Type
Papers
Information
Journal of Plasma Physics , Volume 73 , Issue 5 , October 2007 , pp. 731 - 740
Copyright
Copyright © Cambridge University Press 2006

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