Lithium injection reduces both the hydrogenic and carbon influxes, with improved confinement persisting over successive disharges. Core ion thermal diffusion nearly vanishes, leaving outward convection dominant, often producing flat-topped temperature profiles. Simulations of Li pellet recycling scans with constant edge temperature are presented. This limiter, L3, consists of a cylindrical body covered with stainless steel mesh. Liquid lithium is supplied to the mesh surface via a flow tube from an in-situ reservoir.
Internal heaters permit operation of the limiter well above the lithium melting point.
Results of these first experiments with L3 in CDX-U will be discussed.