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Katayama, Kazunari*; Ushida, Hiroki*; Matsuura, Hideaki*; Fukada, Satoshi*; Goto, Minoru; Nakagawa, Shigeaki
Fusion Science and Technology, 68(3), p.662 - 668, 2015/10
Times Cited Count:16 Percentile:79.46(Nuclear Science & Technology)Tritium production utilizing nuclear reactions by neutron and lithium in a high-temperature gas-cooled reactor is attractive for development of a fusion reactor. From viewpoints of tritium safety and production efficiency, tritium confinement technique is an important issue. It is known that alumina has high resistance for gas permeation. In this study, hydrogen permeation experiments in commercial alumina tubes were conducted and hydrogen permeability, diffusivity and solubility was evaluated. By using obtained data, tritium permeation behavior from an AlO-coated Li-compound particle was simulated. Additionally, by using literature data for hydrogen behavior in zirconium, an effect of Zr incorporation into an AlO coating on tritium permeation was discussed. It was indicated that the majority of produced tritium was released through the AlO coating above 500C. However, it is expected that total tritium leak is suppressed to below 0.67% of total tritium produced at 500C by incorporating Zr fine particles into the inside of AlO coating.
Kumagai, Jun*; Inagaki, Hiroki*; Kariya, Susumu*; Ushida, Takahiro*; Shimizu, Yuta*; Kumada, Takayuki
Journal of Chemical Physics, 127(2), p.024505_1 - 024505_13, 2007/07
We carried out an electron spin resonance (ESR) study on hydrogen ion radicals produced by radiolysis of solid parahydrogen. We newly observed totally more than fifty resolved lines in irradiated solid parahydrogens. We assigned these lines to be isotope substituents of H-core H ions such as HD, HD, and HD throughout comparison of their ESR parameters with theoretical results. These results show conclusive evidence that H-core H ions are produced and stably trapped in irradiated solid hydrogens. We also observed a lowering symmetry on electron wave function in HD and HD, and isotope-substitution reactions such as H+DHD+H and H+HDHD+H.
Kushida, Takushi*; Narumi, Issei; Fujiwara, Shinsuke*; Imanaka, Tadayuki*; Higashibata, Hiroki*
no journal, ,
no abstracts in English
Kurauchi, Yasuyuki*; Kushida, Takushi*; Narumi, Issei; Fujiwara, Shinsuke*; Imanaka, Tadayuki*; Higashibata, Hiroki*
no journal, ,
no abstracts in English
Kushida, Takushi*; Kurauchi, Yasuyuki*; Narumi, Issei; Fujiwara, Shinsuke*; Imanaka, Tadayuki*; Higashibata, Hiroki*
no journal, ,
no abstracts in English
Kushida, Takushi*; Narumi, Issei; Fujiwara, Shinsuke*; Imanaka, Tadayuki*; Higashibata, Hiroki*
no journal, ,
no abstracts in English
Kushida, Takushi*; Narumi, Issei; Fujiwara, Shinsuke*; Imanaka, Tadayuki*; Higashibata, Hiroki*
no journal, ,
no abstracts in English
Higashibata, Hiroki*; Kushida, Takushi*; Narumi, Issei; Imanaka, Tadayuki*; Fujiwara, Shinsuke*
no journal, ,
no abstracts in English
Kushida, Takushi*; Narumi, Issei; Fujiwara, Shinsuke*; Imanaka, Tadayuki*; Higashibata, Hiroki*
no journal, ,
no abstracts in English