Thermal diffusivity induced by resistive pressure-gradient-driven turbulence

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Abstract
The calculation of the thermal diffusivity induced by resistive pressure-gradient-driven turbulence is revisited. The relevant correlation length for the magnetic fluctuations is shown to be different from estimates made with a mixing-length approach and with dimensional analysis. This leads to different scaling predictions for the electron heat diffusivity. The root of this difference is the fact that the flux and current perturbations are related by two scale lengths, the poloidal wavelength and the mode width.