Sputtering yield formula for B(sub 4)C irradiated with monoenergetic ions at normal incidence

摘要

To fill a lack in sputtering yield data for a B(sub 4)C material which may be a promising plasma-facing material in fusion devices, yields of H(sup +), D(sup +), T(sup +), He(sup +), B(sup +), C(sup +), Ne(sup +), Ar(sup +) and Kr(sup +) ions were calculated for this multi-component material for normal incidence with a computer simulation code ACAT. A fitting formula of sputtering yield for a B(sub 4)C was proposed based on an empirical formula for monoatomic target materials at normal incidence. By fitting the formula to the calculated data, best-fit values of the parameters included in it were derived for the material. Good agreement was found between the formula and the data. Thus, the formula proposed for the multi-component material provides a way to estimate the erosion of a B(sub 4)C material irradiated with above ions at normal incidence. Preferential sputtering for this material was also mentioned briefly. (author)