Modelling of turbulent impurity transport in fusion edge plasmas using measured and calculated ionization cross sections

Abstract

Turbulent transport of trace impurities in the edge and scrape-off-layer of tokamak fusion plasmas is modelled by three dimensional electromagnetic gyrofluid computations including evolution of plasma profile gradients. The source function of impurity ions is dynamically computed from pre-determined measured and calculated electron impact ionization cross section data. The simulations describe the generation and further passive turbulent E×B advection of the impurities by intermittent fluctuations and coherent filamentary structures (blobs) across the scrape-off-layer.