“…Tungsten has been investigated extensively by first-principles calculations, 1-29 including the energetics and kinetics of vacancy and interstitial 2, 3,5,7,8,23,26,27 , the energetics and kinetics of Helium 6,7,[9][10][11][12] , Ar/Ne/Kr/Xe 28,29 , and Hydrogen 10,12,[15][16][17][18]20,29 , Hydrogen and vacancies 10,12,18 , and the solute−point defect interactions 19,22 . The interaction of vacancies has been investigated 4,7,8,21 , whereas the interaction of self-interstitials in W has not been reported to date. There are still some incompleteness and controversy for the fundamental parameters of bcc-W. We would try to obtain a more complete and more precise set of fundamental parameters and try to resolve the controversies as well.…”