Penetration of deuterium into neutron-irradiated tungsten under plasma exposure

Miyuki Yajima, Yuji Hatano, Vladimir Kh Alimov, Takeshi Toyama, Tatsuya Kuwabara, Thomas Schwarz-Selinger, Yasuhisa Oya, Alexander V. Spitsyn, Noriyasu Ohno

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Hydrogen isotope trapping at lattice defects in neutron-irradiated tungsten (W), a leading candidate as plasma facing material, is an important problem determining tritium (T) inventory in a vacuum vessel of a future fusion reactor. In this study, W samples were irradiated with neutrons in the Belgium Reactor 2 at 563 K to 0.06 or 0.016 displacement per atom (dpa). After characterizing defects by positron lifetime measurements, deuterium (D) penetration under exposure to D plasma was examined at 563-773 K. Positron lifetime showed the presence of dislocations, monovacancies and relatively large vacancy clusters. These defects trapped D atoms with different values of binding energy. Dependence of D retention on plasma exposure temperature and damage level indicated that the concentrations of weak traps with smaller binding energy increased more significantly with damage level than those of strong traps.

Original languageEnglish
Article number124042
JournalPhysica Scripta
Volume96
Issue number12
DOIs
Publication statusPublished - 2021 Dec

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