抄録
Erosion of boron exposed to deuterium plasmas containing carbon impurity is investigated using a Monte Carlo simulation model for ion-solid interactions which takes dynamic composition change in the surface layer into account. The calculated results are compared with an erosion experiment of a boronized graphite test piece in TEXTOR-94. The implantation of carbon impurities strongly decreases the boron sputtering yield as a result of the formation of a thick carbon containing layer near the surface. These calculations can explain the experimental observations of surface erosion near the plasma edge and deposition of carbon at the surface location far from it. However, non-linear change of the observed thickness of boronized layer with time is not reproduced by the simulation. Furthermore, the carbon depth profile observed after the plasma exposure broadens inside the layer, deeper than the calculated profile.
