Effects of high heat flux hydrogen and helium mixture beam irradiation on surface modification and hydrogen retention in tungsten materials

Kazutoshi Tokunaga, T. Fujiwara, K. Ezato, S. Suzuki, M. Akiba, H. Kurishita, S. Nagata, B. Tsuchiya, A. Tonegawa, N. Yoshida

Research output: Contribution to journalArticle

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Abstract

High heat flux experiments using a hydrogen-helium mixture beam have been carried out on powder metallurgy tungsten (PM-W) and ultra fine grain W-TiC alloy (W-0.5 wt%TiC-H 2 ). The energy of is 18 keV. Beam flux and heat flux at the beam center is 2.0 × 10 21 atoms/m 2 s and 7.0 MW/m 2 , respectively. Typical ratio of He/D ion is 0.25. Beam duration is 1.5-3 s and interval of beam shot start is 30 s. The samples are irradiated up to a fluence of 10 22 -10 24 He/m 2 by the repeated irradiation pulses. After the irradiation, surface modification by the irradiation and hydrogen retention, surface composition have been investigated. Surface modification by hydrogen-helium mixture beams is completely different from results of single beam irradiation. In particular, mixture beam irradiation causes remarkably high hydrogen retention.

Original languageEnglish
Pages (from-to)916-920
Number of pages5
JournalJournal of Nuclear Materials
Volume390-391
Issue number1
DOIs
Publication statusPublished - Jun 15 2009

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Helium
Tungsten
Surface treatment
Heat flux
heat flux
Hydrogen
tungsten
helium
Irradiation
irradiation
hydrogen
Tungsten powder metallurgy
Surface structure
powder metallurgy
Ions
Fluxes
Atoms
shot
fluence
intervals

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)

Cite this

Effects of high heat flux hydrogen and helium mixture beam irradiation on surface modification and hydrogen retention in tungsten materials. / Tokunaga, Kazutoshi; Fujiwara, T.; Ezato, K.; Suzuki, S.; Akiba, M.; Kurishita, H.; Nagata, S.; Tsuchiya, B.; Tonegawa, A.; Yoshida, N.

In: Journal of Nuclear Materials, Vol. 390-391, No. 1, 15.06.2009, p. 916-920.

Research output: Contribution to journalArticle

Tokunaga, K, Fujiwara, T, Ezato, K, Suzuki, S, Akiba, M, Kurishita, H, Nagata, S, Tsuchiya, B, Tonegawa, A & Yoshida, N 2009, 'Effects of high heat flux hydrogen and helium mixture beam irradiation on surface modification and hydrogen retention in tungsten materials', Journal of Nuclear Materials, vol. 390-391, no. 1, pp. 916-920. https://doi.org/10.1016/j.jnucmat.2009.01.235
Tokunaga, Kazutoshi ; Fujiwara, T. ; Ezato, K. ; Suzuki, S. ; Akiba, M. ; Kurishita, H. ; Nagata, S. ; Tsuchiya, B. ; Tonegawa, A. ; Yoshida, N. / Effects of high heat flux hydrogen and helium mixture beam irradiation on surface modification and hydrogen retention in tungsten materials. In: Journal of Nuclear Materials. 2009 ; Vol. 390-391, No. 1. pp. 916-920.
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AU - Tokunaga, Kazutoshi

AU - Fujiwara, T.

AU - Ezato, K.

AU - Suzuki, S.

AU - Akiba, M.

AU - Kurishita, H.

AU - Nagata, S.

AU - Tsuchiya, B.

AU - Tonegawa, A.

AU - Yoshida, N.

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AB - High heat flux experiments using a hydrogen-helium mixture beam have been carried out on powder metallurgy tungsten (PM-W) and ultra fine grain W-TiC alloy (W-0.5 wt%TiC-H 2 ). The energy of is 18 keV. Beam flux and heat flux at the beam center is 2.0 × 10 21 atoms/m 2 s and 7.0 MW/m 2 , respectively. Typical ratio of He/D ion is 0.25. Beam duration is 1.5-3 s and interval of beam shot start is 30 s. The samples are irradiated up to a fluence of 10 22 -10 24 He/m 2 by the repeated irradiation pulses. After the irradiation, surface modification by the irradiation and hydrogen retention, surface composition have been investigated. Surface modification by hydrogen-helium mixture beams is completely different from results of single beam irradiation. In particular, mixture beam irradiation causes remarkably high hydrogen retention.

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