Hydrogen and helium trapping in tungsten under simultaneous irradiations

Hydrogen and helium trapping in polycrystalline tungsten under simultaneous He+–H+ and He+–D+ irradiation was measured by thermal desorption spectroscopy. At 300K: He retention and release are affected very little by the presence of H, closely following He+-only irradiations; He is trapped within ∼3...

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Bibliographic Details
Published in:Journal of nuclear materials 2007-06, Vol.363-365, p.898-903
Main Authors: Lee, H.T., Haasz, A.A., Davis, J.W., Macaulay-Newcombe, R.G., Whyte, D.G., Wright, G.M.
Format: Article
Language:English
Subjects:
Applied sciences
Controled nuclear fusion plants
Deuterium inventory
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Helium
Installations for energy generation and conversion: thermal and electrical energy
Ion–surface interactions
Thermal desorption
Tungsten
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Summary:Hydrogen and helium trapping in polycrystalline tungsten under simultaneous He+–H+ and He+–D+ irradiation was measured by thermal desorption spectroscopy. At 300K: He retention and release are affected very little by the presence of H, closely following He+-only irradiations; He is trapped within ∼30nm of the surface. D retention is similar to D+-only levels but the presence of He enhances D trapping in the near surface, while limiting D diffusion into the bulk; D is trapped within ∼30–35nm of the surface possibly at interstitial sites surrounding He–vacancy defects. At 700K: He retention and release are again similar to He+-only cases; He is trapped within ∼30nm of the surface while no D is observed.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2007.01.111