Abstract
Three-dimensional simulations of turbulence in the boundary plasma of a diverted tokamak indicate strongly localized heating and radial currents on closed flux surfaces in the vicinity of he X point, and overall burstiness. We apply a long-mean-free path theory of par icle and energy exchange between passing and potential-trapped electrons to show that these turbulent phenomena combined with natural fueling asymmetries may lead to electron temperature, density and potential maxima in this region. Such maxima have been observed on the DIII-D tokamak.
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