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Motoshima, Takayuki*; Matsui, Hiroya; Kawakubo, Masahiro*; Kobayashi, Masato*; Ichimura, Tetsuhiro*; Sugita, Yutaka
Nihon Genshiryoku Gakkai-Shi ATOMO
, 64(3), p.163 - 167, 2022/03
no abstracts in English
Mn
Si/Ge(111) heteroepitaxial interfacesNoguchi, Masaya*; Hirata, Tomoaki*; Kawakubo, Yuki*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito
Physica Status Solidi (C), 10(12), p.1732 - 1734, 2013/12
Times Cited Count：0 Percentile：0.01(Nanoscience & Nanotechnology)
(Mn
Fe)Si(111) epitaxially grown on Ge(111)Kawakubo, Yuki*; Noguchi, Masaya*; Hirata, Tomoaki*; Narumi, Kazumasa; Sakai, Seiji; Yamada, Shinya*; Hamaya, Kohei*; Miyao, Masanobu*; Maeda, Yoshihito
Physica Status Solidi (C), 10(12), p.1828 - 1831, 2013/12
Times Cited Count：0 Percentile：0.01(Nanoscience & Nanotechnology)Tachikawa, Hirokazu*; Kawakubo, Fumie*; Shimizu, Akihiko*; Shibata, Toshio*; Azumi, Kazuhisa*; Inoue, Hiroyuki*; Sugimoto, Katsuhisa*; Tsuru, Toru*; Fujimoto, Shinji*
JAEA-Research 2007-086, 74 Pages, 2008/02
JAEA-Research-2007-086.pdf:5.96MB
The corrosion life time of the overpack has been investigated on the basis of experimental data and past research, assuming the ranging geological environment of Japan. However, some subject for the realization of the overpack design, such as the behavior of the overpack under high pH conditions, the behavior of the overpack with change of near-field environmental condition and the corrosion behavior of the welds have still been left. To take into account these conditions, expert committee composed of metal corrosion science experts were established in the Nuclear Safety Research Association and past research outcomes and the theory of safety assessment for long term corrosion resistance were investigated from the view points of metal corrosion science.
Tachikawa, Hirokazu*; Kawakubo, Fumie*; Shimizu, Akihiko*; Shibata, Toshio*; Sugimoto, Katsuhisa*; Seo, Masahiro*; Tsuru, Toru*; Fujimoto, Shinji*; Inoue, Hiroyuki*
JAEA-Research 2006-058, 80 Pages, 2006/10
JAEA-Research-2006-058.pdf:10.86MB
The Japan Nuclear Cycle Development Institute submitted "Second Progress Report on Research and Development for the Geological Disposal of HLW in Japan" to the Japanese government. This report contains investigations of the corrosion life time of the overpack on the basis of experimental data and past research, assuming the ranging geological environment of Japan. However some subjects, such as the behavior of the overpack under high pH conditions and the behavior of the engineering barrier with change of near-field environmental condition with time for promoting reliability have still been left. To take into account these conditions, expert committee composed of metal corrosion science experts were established in the Nuclear Safety Research Association and past research outcomes and the theory of safety assessment were investigated from the view points of long term stability and corrosion resistance of engineering barrier.
Shu, Wataru; Kawakubo, Yukio*; Luo, G.; Nishi, Masataka
Journal of Nuclear Science and Technology, 40(12), p.1019 - 1026, 2003/12
Times Cited Count：4 Percentile：31.64(Nuclear Science & Technology)Recovery of tritium from co-deposited layers is a crucial issue for fusion machines that use carbon as plasma facing materials. In this study, the removal rate of the JT-60 and TFTR co-deposited layers by KrF laser was measured for varying laser energy density. The removal rate of 5.0 
m/pulse was achieved for the JT-60 co-deposited layers at the energy density of 11 J/cm
for KrF excimer laser. Hydrogen (tritium) was released in the form of hydrogen molecules and readily recovered. The formation of cones due to local surface melting was observed at the KrF laser energy density of 0.8 J/cm, whereas strong melting was determined to be the mechanism of the ablative removal of the JT-60 co-deposited layers at the energy density greater than the ablation threshold.
Shu, Wataru; Kawakubo, Yukio*; Nishi, Masataka
Applied Physics A, 76(3), p.421 - 425, 2003/03
Times Cited Count：16 Percentile：53.97(Materials Science, Multidisciplinary)Recovery of tritium from co-deposited layers formed in TFTR deuterium-tritium plasma operations was investigated by the use of an ArF excimer laser operating at the wavelength of 193 nm. At the laser energy density of 0.1 J/cm, a transient spike of tritium release rate was observed at initial irradiation. Hydrogen isotopes were released in the forms of hydrogen isotope molecules during the laser irradiation in vacuum, suggesting tritium can be recovered readily from the released gases. In a second experiment, hydrogen (tritium) recovery from the co-deposited layers on JT-60 tiles was investigated by laser ablation with focused beam of the excimer laser. The removal rate of the co-deposited layers was low when the laser energy density was smaller than the ablation threshold (1.0 J/cm), but reached to 1.1 m/pulse at the laser energy density of 7.6 J/cm. The temperature on the surface during the irradiation was measured on the basis of Planck's law of radiation, and the maximum temperature at the laser energy density of 0.5 J/cm decreased from 3570 K at the initial irradiation to 2550 K at 1000th pulse of the irradiation.
Shu, Wataru; Kawakubo, Yukio*; Masaki, Kei; Nishi, Masataka
Journal of Nuclear Materials, 313-316(1-3), p.584 - 587, 2003/03
Times Cited Count：22 Percentile：79.74(Materials Science, Multidisciplinary)no abstracts in English
Shu, Wataru; Kawakubo, Yukio*; Ohira, Shigeru; Oya, Yasuhisa; Hayashi, Takumi; Nakamura, Hirofumi; Iwai, Yasunori; Nishi, Masataka; Gentile, C. A.*; Skinner, C. H.*; et al.
Fusion Science and Technology, 41(3), p.690 - 694, 2002/05
no abstracts in English
MnSi/Ge(111) heteroepitaxial interfacesNoguchi, Masaya*; Hirata, Tomoaki*; Kawakubo, Yuki*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito
no journal, ,
(MnFe)Si epitaxially grown on Ge(111)Kawakubo, Yuki*; Noguchi, Masaya*; Narumi, Kazumasa; Sakai, Seiji; Hamaya, Kohei*; Miyao, Masanobu*; Maeda, Yoshihito
no journal, ,
no abstracts in English
Si epitaxially grown on Si(111) with ion channelingKawakubo, Yuki*; Noguchi, Masaya*; Hirata, Tomoaki*; Maeda, Yoshihito; Sakai, Seiji; Narumi, Kazumasa
no journal, ,
no abstracts in English
Si on Si(111) heterointerfaceKawakubo, Yuki*; Noguchi, Masaya*; Mizuki, Tatsuya*; Narumi, Kazumasa; Sakai, Seiji; Hamaya, Kohei*; Miyao, Masanobu*; Maeda, Yoshihito
no journal, ,
no abstracts in English
-FeSi nanocrystals by Cu dopingHirata, Tomoaki*; Kagawa, Seiya*; Nagatsuyu, Tomohiro*; Shibahara, Kohei*; Iwamoto, Ryotaro*; Kawakubo, Yuki*; Noguchi, Masaya*; Mizuki, Tatsuya*; Narumi, Kazumasa; Sakai, Seiji; et al.
no journal, ,
no abstracts in English
-FeSiNoguchi, Masaya*; Mizuki, Tatsuya*; Kawakubo, Yuki*; Hirata, Tomoaki*; Kagawa, Seiya*; Nagatsuyu, Tomohiro*; Iwamoto, Ryotaro*; Shibahara, Kohei*; Narumi, Kazumasa; Maeda, Yoshihito
no journal, ,
no abstracts in English
Si(111)/Si(111) heteroepitaxial interfacesNoguchi, Masaya*; Kawakubo, Yuki*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito
no journal, ,
no abstracts in English
