Irradiation effect on deuterium behaviour in low-dose HFIR neutron-irradiated tungsten

Shimada, Masashi; Cao, G.; Otsuka, T.; Hara, M.; Kobayashi, M.; Oya, Y.; Hatano, Y.

doi:10.1088/0029-5515/55/1/013008

Title: Irradiation effect on deuterium behaviour in low-dose HFIR neutron-irradiated tungsten

Journal Article · Mon Dec 01 00:00:00 EST 2014 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/55/1/013008· OSTI ID:1200856

Shimada, Masashi ^[1]; Cao, G. ^[2]; Otsuka, T. ^[3]; Hara, M. ^[4]; Kobayashi, M. ^[5]; Oya, Y. ^[5]; Hatano, Y. ^[4]

Idaho National Lab. (INL), Idaho Falls, ID (United States)
Univ. of Wisconsin-Madison, Madison, WI (United States)
Kyushu Univ., Fukuoka (Japan)
Univ. of Toyama, Toyama (Japan)
Shizuoka Univ., Shizuoka (Japan)

Tungsten samples were irradiated by neutrons in the High Flux Isotope Reactor, Oak Ridge National Laboratory at reactor coolant temperatures of 50-70°C to low displacement damage of 0.025 and 0.3 dpa under the framework of the US-Japan TITAN program (2007-2013). After cooling down, the HFIR neutron-irradiated tungsten samples were exposed to deuterium plasmas in the Tritium Plasma Experiment, Idaho National Laboratory at 100, 200 and 500 °C twice at the ion fluence of 5×10²⁵ m⁻² to reach a total ion fluence of 1×10²⁶ m⁻² in order to investigate the near surface deuterium retention and saturation via nuclear reaction analysis. Final thermal desorption spectroscopy was performed to elucidate irradiation effect on total deuterium retention. Nuclear reaction analysis results showed that the maximum near surface (<5 µm depth) deuterium concentration increased from 0.5 at % D/W in 0.025 dpa samples to 0.8 at. % D/W in 0.3 dpa samples. The large discrepancy between the total retention via thermal desorption spectroscopy and the near surface retention via nuclear reaction analysis indicated the deuterium was migrated and trapped in bulk (at least 50 µm depth for 0.025 dpa and 35 µm depth for 0.025 dpa) at 500 °C case even in the relatively low ion fluence of 10²⁶ m⁻².

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

Sponsoring Organization:: USDOE

OSTI ID:: 1200856

Report Number(s):: INL/JOU-14-32106

Journal Information:: Nuclear Fusion, Vol. 55, Issue 1; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 55 works

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