Speaker
Description
Two simulation programs SDTrimSP and RDS-BASIC were used to study the variation of sputtering energy threshold values (Eth) of beryllium metal irradiated by Helium, Tritium, and Deuterium ions when bombarded at various angles of incidence. The study aims to mimic the actual condition that the beryllium first wall of the International Thermonuclear Experimental Reactor (ITER) is subjected to in regular operation conditions. In all of the studied irradiation systems, we found that increasing the angle of incidence causes Eth values to decrease gradually until they reach their minimum values at an angle range between 40o and 70o. The Eth minimum values were found to be (10% to 35%) lower than their normal incidence value Eth(0o). These results were discussed theoretically and compared with one suggested theoretical model.
