Influence of crystallite size on sputtering coefficients of tungsten by hydrogen isotopes and argon

Using the code developed, we obtained for the first time the sputtering coefficients Y of a tungsten target with hydrogen and argon isotopes in the energy range of bombarding particles 0.01–100 keV, depending on the crystallite size and the type of surface potential barrier. It has been shown that at energies above 100 eV, with increasing crystallite size, a significant increase in the sputtering coefficient is observed. The strong influence of the choice of surface barrier type on the results of calculations of sputtering coefficients has been demonstrated. The results obtained are necessary for analyzing the entry of tungsten impurities into the hot zone of the tokamak plasma.