FEATURES OF STRUCTURAL DAMAGES OF SURFACE OF TUNGSTEN AS A RESULT OF IRRADIATION WITH HELIUM ION BEAMS WITH ENERGY 4 MeV

Abstract

The beams of ions of helium (EHe+= 4 МeV) affected samples of tungsten with purity 99.5%. The radiation characteristics of tungsten have been studied. The change in characteristics was caused by irradiation with helium ion beams. Numerical values of the number of vacancies and phonons were obtained depending on the depth of the layer in tungsten (maximum at a depth of 6.1 μm). The sputtering coefficients of atoms from the surface of tungsten are found. The mean free path of helium ions was up to 70 μm. It is determined that the maximum destruction of the surface occurs in the region of the pits. Pits appear in five times more than bubbles.