Abstract
Positron lifetime and Doppler broadening measurements were made on uniformly helium-implanted tungsten to study the evolution of defects and helium bubbles during post-irradiation isochronal annealing. Helium decoration of loops gets enhanced below 500°C. Above 550°C helium gets dissociated from loops and the loops anneal out upon further annealing. Coarsening of helium-decorated vacancy clusters results in the formation of helium-filled voids, which upon annealing above 900°C transform into helium bubbles. The bubble parameters deduced from the positron lifetime data using a model analysis indicate the presence of overpressurized bubbles.
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