New SubmissionToroidal nonuniformities of divertor targets and electron transport in a tokamak SOL

Non-axisymmetric perturbations of divertor “floor” and, correspondingly, sheath potential affect electron drift orbits in the SOL and may lead to non-ambipolar electron radial transport, including convection, diffusion, and mobility. Corresponding rates are calculated analytically and verified by direct numerical simulations of electron drift orbits. Such non-ambipolar electron transport may be relevant for the “heuristic” model of the SOL width and important for plasma transport for the case of “shaped” divertor tiles in ITER and other future fusion reactors.