SPUTTER-INDUCED EROSION ON MATERIALS FOR FUSION REACTOR FIRST-WALL

摘要

Sputter-induced erosion of first-wall materials in controlled thermonuclear fusion devices is caused by different plasma particles and products, escaping through the magnetic confinement. The eroded materials causes a severe fusion plasma contamination which increases the energy losses. Candidate materials for plasma-facing components should have low erosion yields during-simultaneous interaction with all energetic particles and species-including eroded materials.In this review the main information of the energy dependent sputtering yields for various plasma particles on candidate first-wall materials and coatings, are presented. Beside physical sputtering, in which atomic collisions are necessary, mechanical sputtering with macroscopic particles and photodeposition sputtering by the incident laser beam have been investigated too. It was found that whatever the mechanism of sputtering is, the similarity between erosion yield and angular dependence does exist.