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(TH/P1-14) Short Wavelength Temperature Gradient Driven Modes in Tokamak Plasmas

A. Smolyakov1), M. Yagi2), Y. Kishimoto3), R. Sydora4)
1) Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Canada
2) Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan
3) Department of Fusion Research, Japan Atomic Energy Research Institute, Naka, Japan
4) Department of Physics, University of Alberta, Edmonton, Canada

Abstract.  In this work we report on short wavelength temperature gradient driven modes that are unstable for large values of the Larmor radius parameter. A new instability is found in this region due to the non-Boltzmann plasma density response for modes whose frequency increases with the wave vector slower than a linear function. Instability is investigated with local and non-local differential equation eigen-mode analysis and confirmed with analytical model. Mode extends over to the region of the electron skin-depth and affects the electron energy transport. In toroidal plasma short wavelength modes match to the ubiquitous mode requiring trapped electrons.

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IAEA 2003