Analysis and optimization of the edge plasma of joule tokamak discharges

The following topics are discussed: Introduction (the principle of a Tokamak); Diagnostics of the edge plasma (Thomson scattering, Langmuir probes, laser-induced fluorescence); Computer Simulations of the Plasma Edge (atom physical data, transport models, neutral gas models); Characterization of the Edge Plasma (electron temperature and density, particle fluxes and recycling, transport within the plasma edge, edge limits, isotope effect); emission and transport of impurities (physical sputtering, plasma induced discharges, evaporation, chemical spray, sublimation, transport of impurities, profiles of impurities' concentration); Joule Discharges of high density (phenomenology, time dependence, particle transport in the edge plasma, correlations of the edge parameters, comparison with the detached plasma); Injection of Hydrogen Pellets (pellet ablation, plasma response, relaxation after pellet injection); Synopsis. (AH)