Effect of neutron energy and fluence on deuterium retention behaviour in neutron irradiated tungsten

Hiroe Fujita, Kenta Yuyama, Xiaochun Li, Yuji Hatano, Takeshi Toyama, Masayuki Ohta, Kentaro Ochiai, Naoaki Yoshida, Takumi Chikada, Yasuhisa Oya

Research output: Contribution to journalConference articlepeer-review

26 Citations (Scopus)

Abstract

Deuterium (D) retention behaviours for 14 MeV neutron irradiated tungsten (W) and fission neutron irradiated W were evaluated by thermal desorption spectroscopy (TDS) to elucidate the correlation between D retention and defect formation by different energy distributions of neutrons in W at the initial stage of fusion reactor operation. These results were compared with that for Fe2+ irradiated W with various damage concentrations. Although dense vacancies and voids within the shallow region near the surface were introduced by Fe2+ irradiation, single vacancies with low concentration were distributed throughout the sample for 14 MeV neutron irradiated W. Only the dislocation loops were introduced by fission neutron irradiation at low neutron fluence. The desorption peak of D for fission neutron irradiated W was concentrated at low temperature region less than 550 K, but that for 14 MeV neutron irradiated W was extended toward the higher temperature side due to D trapping by vacancies. It can be said that the neutron energy distribution could have a large impact on irradiation defect formation and the D retention behaviour.

Original languageEnglish
Article number014068
JournalPhysica Scripta
Volume2016
Issue numberT167
DOIs
Publication statusPublished - 2016 Jan 25
Event15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015 - Aix-en-Provence, France
Duration: 2015 May 182015 May 22

Keywords

  • neutron irradiation
  • plasma first wall interaction
  • tungsten

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics

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