A. Hirose et al 2005 Nucl. Fusion 45 1628 doi:10.1088/0029-5515/45/12/018
A. Hirose, S. Livingstone and A.K. Singh
Show affiliationsAnalysis based on a gyro-kinetic ballooning stability code predicts that both the ion and electron thermal diffusivities, due to the ion temperature gradient (ITG) and electron temperature gradient (ETG) modes, respectively, increase with the safety factor q almost linearly. In the case of ITG driven ion thermal diffusivity, the q dependence originates from the coupling to the ion acoustic mode, and in the case of the electron thermal diffusivity due to the ETG mode, it emerges from the coupling to the skin size drift mode. In the ETG mode, charge neutrality does not hold for typical tokamak discharges, and mixing length estimates yield a thermal diffusivity large enough to be relevant to experiments.
Issue 12 (December 2005)
Received 30 November 2004, accepted for publication 29 September 2005
Published 24 November 2005
A. Hirose et al 2005 Nucl. Fusion 45 1628
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