Abstract
A new dual irradiation system which links a 1300 kV HVEM and 300 keV ion accelerator has been developed. Using this system, dual irradiation studies can be made under in-situ observation. At low doses, the dislocation loop structures were strongly affected by helium of the order of: preinjection irradiation, dual irradiation and simple electron irradiation. The effect on cavity formation showed that helium injected during dual irradiation enhances the cavity nucleation without the suppression of their subsequent growth. This study is the first report on dual irradiation by electrons and helium ions.
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