Neutron irradiated tungsten bulk defect characterization by positron annihilation spectroscopy

Taylor, Chase N.; Shimada, Masashi; Watkins, Joseph M.; Hu, Xunxiang; Oya, Yasuhisa

doi:10.1016/j.nme.2021.100936

Title: Neutron irradiated tungsten bulk defect characterization by positron annihilation spectroscopy

Journal Article · Mon Mar 01 00:00:00 EST 2021 · Nuclear Materials and Energy

DOI:https://doi.org/10.1016/j.nme.2021.100936· OSTI ID:1770461

Taylor, Chase N.; Shimada, Masashi; Watkins, Joseph M.; Hu, Xunxiang; Oya, Yasuhisa

Positron annihilation spectroscopy was used to evaluate the defects in neutron irradiated tungsten exposed at five different irradiation conditions. The variables in neutron irradiation included temperature, displacements per atom (dpa), and neutron spectrum. A set of W, WRe, and WReOs control samples were used in assessing the data, and experimental positron lifetime of Re is reported as 129.3 ± 1.1 ps. Positron annihilation lifetime spectroscopy and coincidence Doppler broadening measurements revealed that samples irradiated at 500ºC had more and larger vacancy clusters than samples irradiated at higher temperatures. This trend was observed despite some higher temperature samples having a significantly higher dpa. Analysis of the R-parameter clearly shows that samples contain one of two predominant defect types, and positron lifetimes indicate these are divided into large (>40) and small (<10) vacancy clusters, respectively. These combined results suggest that for nuclear fusion reactors, plasma facing component temperature has a much stronger effect on defect size than does dpa.

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Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1770461

Alternate ID(s):: OSTI ID: 2228265

Report Number(s):: INL/CON-20-59239-Rev000; S2352179121000296; 100936; PII: S2352179121000296

Journal Information:: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Vol. 26 Journal Issue: C; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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