Abstract
The contact of the plasma with the surrounding walls leads to surface erosion and production of impurity atoms. Obvious signs of erosion in today's high temperature plasma experiments are the characteristic cathode arc tracks and local melting spots from overheated areas. Impurity production by sputtering is not so readily observed. It can, however, be deduced from mass and energy analysis of impurity atoms leaving the wall and divertor plates. The mechanism of sputtering, evaporation and arcing will be outlined. The conditions found in the boundary layer of today's tokamaks, i.e. the particle fluxes and energies, will be presented and estimates for the erosion rates will be made for the different erosion processes.
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