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Electron Heat Transport in a Tokamak with Helical Perturbations

The electron heat transport is enhanced above the Pfirsch-Schluter factor by small-scale resonant helical perturbations in the collisional transport. In the plateau and MHD regime of the neo-classical theory, thermal conductivity across the magnetic surface shown by κ // ( b r / B 0 ) 2 is dominant. It changes into the Bohm type transport with a small coefficient in the transition regime from the plateau to the banana. Here κ // is parallel electron thermal conductivity, b r and B 0 denote a radial component of the helical perturbations and a toroidal magnetic field, respectively.