MODELING OF IMPURITY PRODUCTION AND TRANSPORT IN THE SCRAPE-OFF LAYEROF A HIGH-DENSITY LIMITER TOKAMAK

A simple analytical model is presented that describes impurity ion pro duction and transport in the tokamak scrape-off layer (SOL). The equat ions of the model are solved analytically in the test particle approxi mation. The solution, as a function of different plasma parameters and target materials, is discussed in the case in which the background pl asma is described by the simple SOL model and a comparison between the model and the numerical results of a 2-D multifluid code is presented .