Production and annihilation of deuterium traps in He-irradiated vanadium

Takagi, Ikuji; Matsubara, Naoko; Akiyoshi, Masafumi; Sasaki, Takayuki; Moritani, Kimikazu; Moriyama, Hirotake

doi:10.1016/j.jnucmat.2007.01.120

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…In our previous studies, the trap production rate has been obtained as 0.015 for Ni [15], around 0.011 for Ta [9], 0.021 for V [16], and 0.007 for Mo [17]. A value of 0.0046 in the present work is significantly smaller than the values for those above materials.…”

Section: Trap Productioncontrasting

confidence: 57%

Hydrogen traps in ion-irradiated F82H steel observed by NRA

Takagi

Komura

Akiyoshi

et al. 2013

Journal of Nuclear Materials

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Characteristics of irradiation-induced trapping of hydrogen were investigated for quantitative evaluation of tritium retention in F82H steel. Before and after irradiation of 0.8-MeV 4 He or 0.3-MeV H ions, deuterium depth profiles near the surface of a disk sample were observed by nuclear reaction analysis under continuous exposure of deuterium plasma. One type of trap, with a trapping energy of 0.66 eV, was observed after each irradiation. The ratio of trap production rate to atomic displacement was 0.0046 and 0.0014 for He and H irradiation, respectively. Annihilation occurred around 600 K for H irradiation but was not observed even at 691 K for He irradiation. Traps are likely to be interstitial-like sites associated with dislocation loops. This study also indicates that helium plays a role in inhibiting trap annihilation. In addition, the deuterium diffusion coefficient in non-irradiated F82H was determined by a time-lag permeation experiment.

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Section: Trap Productioncontrasting

confidence: 57%

Hydrogen traps in ion-irradiated F82H steel observed by NRA

Takagi

Komura

Akiyoshi

et al. 2013

Journal of Nuclear Materials

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“…A detailed consideration is, however, difficult given that estimation of the production ratio depends on the displacement energy, which has not been accurately determined. Notably, the trap production ratio obtained in the present study is a moderate value compared with those of other metals such as 0.015 for Ni [18], 0.021 for V [19] and 0.007 for Mo [20].…”

Section: Trap Productionmentioning

confidence: 41%

Hydrogen trapping in 3He-irradiated Fe

Takagi

Matsuoka

Tanaka

et al. 2013

Nuclear Instruments and Methods in Physics Research Section B:

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The characteristics of irradiation-induced hydrogen (deuterium) traps in pure Fe were investigated for quantitative evaluation of tritium retention in fusion reactor components. The deuterium depth profiles of an Fe disk sample exposed to deuterium plasma were observed by means of nuclear reaction analysis (NRA) before and after irradiation with 0.8 MeV or 1.3 MeV 3 He ions. Irradiation generated a number of traps, and deuterium retention was drastically increased subsequent to irradiation. Steady-state deuterium concentration in the trap and the solution sites were obtained by continuously charging the sample with deuterium during the NRA. Based on these values, the trapping energy, which is the enthalpy difference between the two sites, was estimated to be 0.38 eV. The number ratio of the trap to atomic displacement was 0.013. Some of the traps were annihilated around 523 K. The annihilation temperature, the trapping energy, and the equilibrium constant suggest that the trap is a dislocation loop introduced by the irradiation. It is deduced that the tritium inventory in the Fe components of a reactor should be drastically increased by neutron irradiation due to the formation of traps, but may be significantly reduced by high temperature operation of the components.

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Synergetic effect of H and He with vacancy in vanadium solid from first-principles simulations

Zhao

Wen

2013

Nuclear Instruments and Methods in Physics Research Section B:

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Production and annihilation of deuterium traps in He-irradiated vanadium

Cited by 6 publications

References 16 publications

Hydrogen traps in ion-irradiated F82H steel observed by NRA

Hydrogen traps in ion-irradiated F82H steel observed by NRA

Hydrogen trapping in 3He-irradiated Fe

Synergetic effect of H and He with vacancy in vanadium solid from first-principles simulations

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