ExB-drift, current, and kinetic effects on divertor plasma profiles during ELMs

The transient heat load on divertor surfaces from edge-localized modes (ELMs) in tokamaks can be very large and thus of concern for a large device such as ITER. Models for kinetic modifications to fluid models are discussed that should allow a reasonable description of the long mean-free path regime encountered owing to the high plasma temperatures in the scrape-off layer (SOL) during large ELMs. A set of two-dimensional simulations of the dynamic response of the SOL plasma to an ELM is presented. The role of plasma currents and ExB motion is emphasized, which cause large changes in divertor density and temperature, but small changes in the outer-plate heat flux