Abstract
Variable-energy (0–30 keV) positron beam studies have been carried out on 70 keV He-implanted fusion reactor candidate stainless steels, JPCA (Japanese Prime Candidate Alloy). Doppler broadening profiles of the positron annihilation as a function of incident positron energy were shown to be quite sensitive to defects introduced by He-implantation. A fitting model neglecting positron diffusion into the defects was used to analyze parameterized momentum data. The variation of the defect profile as a function of isochronal annealing temperature showed a clear correlation with the release rate of He measured by a quadrupole mass spectrometer.
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