Numerical simulation of turbulent heat flows

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Abstract
Previous work on simulating turbulence in finite beta tokamak plasmas with isothermal models is extended to include temperature perturbations and temperature gradients in a collisional plasma. Turbulent heat as well as plasma flows are treated. The toroidal ion temperature gradient mode is the dominant source of turbulence in the model. Electron temperature gradients can stabilize the electron collisional drift mode and lead to reverse plasma flows (or thermal pinches). Magnetic electron heat conduction is found to be very small when correlations between temperature and magnetic field perturbations are considered. Quasilinear theory and mixing length rules are found to give a good representation of the results.