High energy cascades in gold as studied by high energy self-ion irradiation

摘要: Abstract Primary knock-on atom (PKA) energy spectrum extends up to several hundreds of keV in fusion reactor materials irradiated with 14 MeV neutrons. When we are going evaluate behavior an expected d-Li type intense neutron source, fundamental knowledge on effects high PKA formation cascade damage, microstructural evolution and properties is required. In this study, 170 self-ion irradiation thin foils gold were performed estimate very defect clusters by damage its interactions. Defect vacancy observed the 5 × 10 13 –1 × 10 15 ions/m 2 . case self-ions which projected range exists at 6.3 μm from ion incident surface, films gold, 1.1, 3.0, 4.3, 7.2 thickness, placed front 50 nm thick specimens change within specimens. The number a cluster group formed varied thickness film. High was found increase clusters. However, size distributions not strongly dependent energies. Interactions cascades result appearance new near existing groups higher dose range. Dose dependence density similar that fission contribution than 400 interactions estimated calculated low data.