Neutron irradiated tungsten bulk defect characterization by positron annihilation spectroscopy
Abstract
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.
- Authors:
- Publication Date:
- Research Org.:
- Idaho National Laboratory (INL), Idaho Falls, ID (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1770461
- Alternate Identifier(s):
- OSTI ID: 2228265
- Report Number(s):
- INL/CON-20-59239-Rev000
Journal ID: ISSN 2352-1791; S2352179121000296; 100936; PII: S2352179121000296
- Grant/Contract Number:
- AC07-05ID14517
- Resource Type:
- Published Article
- Journal Name:
- Nuclear Materials and Energy
- Additional Journal Information:
- Journal Name: Nuclear Materials and Energy Journal Volume: 26 Journal Issue: C; Journal ID: ISSN 2352-1791
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Tungsten; rhenium; defects; neutron irradiation; positron annihilation spectroscopy
Citation Formats
Taylor, Chase N., Shimada, Masashi, Watkins, Joseph M., Hu, Xunxiang, and Oya, Yasuhisa. Neutron irradiated tungsten bulk defect characterization by positron annihilation spectroscopy. Netherlands: N. p., 2021.
Web. doi:10.1016/j.nme.2021.100936.
Taylor, Chase N., Shimada, Masashi, Watkins, Joseph M., Hu, Xunxiang, & Oya, Yasuhisa. Neutron irradiated tungsten bulk defect characterization by positron annihilation spectroscopy. Netherlands. https://doi.org/10.1016/j.nme.2021.100936
Taylor, Chase N., Shimada, Masashi, Watkins, Joseph M., Hu, Xunxiang, and Oya, Yasuhisa. Mon .
"Neutron irradiated tungsten bulk defect characterization by positron annihilation spectroscopy". Netherlands. https://doi.org/10.1016/j.nme.2021.100936.
@article{osti_1770461,
title = {Neutron irradiated tungsten bulk defect characterization by positron annihilation spectroscopy},
author = {Taylor, Chase N. and Shimada, Masashi and Watkins, Joseph M. and Hu, Xunxiang and Oya, Yasuhisa},
abstractNote = {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.},
doi = {10.1016/j.nme.2021.100936},
journal = {Nuclear Materials and Energy},
number = C,
volume = 26,
place = {Netherlands},
year = {Mon Mar 01 00:00:00 EST 2021},
month = {Mon Mar 01 00:00:00 EST 2021}
}
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