Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 499, Issue -, Pages 464-470Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2017.11.022
Keywords
Hydrogen trapping at defects; Tungsten; Fusion materials; Positron annihilation spectroscopy
Funding
- [26709073]
- Grants-in-Aid for Scientific Research [17H03517] Funding Source: KAKEN
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Deuterium trapping at irradiation-induced defects in tungsten, a candidate material for plasma facing components in fusion reactors, was revealed by positron annihilation spectroscopy. Pure tungsten was electron-irradiated (8.5 MeV at similar to 373 K and to a dose of similar to 1 x 10(-3) dpa) or neutron-irradiated (at 573 K to a dose of similar to 0.3 dpa), followed by post-irradiation annealing at 573 K for 100 h in deuterium gas of similar to 0.1 MPa. In both cases of electron- or neutron-irradiation, vacancy clusters were found by positron lifetime measurements. In addition, positron annihilation with deuterium electrons was demonstrated by coincidence Doppler broadening measurements, directly indicating deuterium trapping at vacancy-type defects. This is expected to cause significant increase in deuterium retention in irradiated-tungsten. (c) 2017 Elsevier B.V. All rights reserved.
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