Effects of helium implantation on damage during pulsed high heat loading of tungsten

Kazutoshi Tokunaga, T. Fujiwara, K. Ezato, S. Suzuki, M. Akiba, N. Yoshida

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A cyclic helium beam with energy 18.7 keV has been used to irradiate stress relieved and recrystallized powder metallurgy tungsten up to a fluence of ∼1023 He/m2. After the helium irradiations, the samples have been exposed to pulsed high heat loading by an electron beam with a heat flux of 1 GW/m2 and duration of 1, 1.5 or 2 ms. Surfaces of irradiated samples become smooth as a result of the electron beam irradiation of 1 GW/m2 for 1 ms, due to atom migration on the surface at high temperature. On the other hands, the surface of irradiated samples is partially melted and resolidified. However, smoothing does not occur around the melted area. Stress relieved tungsten is melted by irradiation of a heat flux of 1 GW/m2 and duration of 1.5 ms, but recrystallized tungsten is not melted by the same heat loading.

Original languageEnglish
Pages (from-to)812-816
Number of pages5
JournalJournal of Nuclear Materials
Volume367-370 A
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - Aug 1 2007

Fingerprint

Helium
Tungsten
implantation
tungsten
helium
Irradiation
damage
heat
Tungsten powder metallurgy
irradiation
Heat flux
heat flux
Electron beams
electron beams
powder metallurgy
smoothing
fluence
Atoms
atoms
Hot Temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Effects of helium implantation on damage during pulsed high heat loading of tungsten. / Tokunaga, Kazutoshi; Fujiwara, T.; Ezato, K.; Suzuki, S.; Akiba, M.; Yoshida, N.

In: Journal of Nuclear Materials, Vol. 367-370 A, No. SPEC. ISS., 01.08.2007, p. 812-816.

Research output: Contribution to journalArticle

Tokunaga, K, Fujiwara, T, Ezato, K, Suzuki, S, Akiba, M & Yoshida, N 2007, 'Effects of helium implantation on damage during pulsed high heat loading of tungsten', Journal of Nuclear Materials, vol. 367-370 A, no. SPEC. ISS., pp. 812-816. https://doi.org/10.1016/j.jnucmat.2007.03.171
Tokunaga, Kazutoshi ; Fujiwara, T. ; Ezato, K. ; Suzuki, S. ; Akiba, M. ; Yoshida, N. / Effects of helium implantation on damage during pulsed high heat loading of tungsten. In: Journal of Nuclear Materials. 2007 ; Vol. 367-370 A, No. SPEC. ISS. pp. 812-816.
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