Relativistic neoclassical radial uxes in the 1= regime

Abstract. The radial neoclassical uxes of electrons in the 1=regime are calculated with relativistic eects taken into account and compared with those in the non-relativistic approach. The treatment is based on the relativistic drift-kinetic equation with the thermodynamic equilibrium given by the relativistic Maxwell-Juttner distribution function. It is found that for the range of fusion temperatures, Te < 100 keV, the relativistic eects produce a reduction of the radial uxes which does not exceed 10%. This rather small eect is a consequence of the non-monotonic temperature dependence of the relativistic correction caused by two counteracting factors: a reduction of the contribution from the bulk and a signicant broadening with the temperature growth of the energy range of electrons contributing to transport. The relativistic formulation for the radial uxes given in this paper is expressed in terms of a set of relativistic thermodynamic forces which is not identical to the canonical set since it contains an additional relativistic correction term dependent on the temperature. At the same time, this formulation allows application of the non-relativistic solvers currently used for calculation of mono-energetic transport coecients