DYNAMIC SIMULATION OF REDEPOSITION OF BACKSCATTERED AND SPUTTERED PARTICLES ON TUNGSTEN IRRADIATED BY PLASMAS

Redeposition of backscattered and sputtered particles due to their ion ization and gyromotion in the scrape-off layer (SOL) is investigated u sing a dynamic simulation model of interaction of Maxwellian carbon io ns with a tungsten surface. The implantation of projectile carbon ions during their bombardment causes reduction in the amounts of sputtered tungsten and backscattered carbon ions, and it causes an additional s puttering of carbon. Due to redeposition of emitted particles on the s urface, the sputtering of tungsten (implanted carbon) is more (less) s uppressed. Furthermore, a thick carbon layer is deposited on the tungs ten surface at high SOL plasma temperatures, at which the surface is e roded if no redeposition is included in the simulation.