Abstract
Defect production and microstructural evolution in fusion materials should be evaluated based on the primary knock-on atom (PKA) energy spectrum. In this study, formation and interaction of cascade damage are evaluated as a function of PKA energy from irradiation experiments on thin foils of gold irradiated with fission neutrons and 21 MeV self-ions. These results are compared with fusion neutron irradiation data. The interaction of cascades at higher dose is found to result in the appearance of new clusters near the existing groups of vacancy clusters. These are considered to come from the conversion of invisible vacancy rich regions to visible clusters by near-by cascades. The minimum PKA energy to produce new visible clusters by interaction is estimated to be 165 keV, assuming that cascade zone size increases with damage energy.
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