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Journal Articles

Current status of geological disposal by "all-Japan" activities, 4; Repository design and engineering technology (2)

Motoshima, Takayuki*; Matsui, Hiroya; Kawakubo, Masahiro*; Kobayashi, Masato*; Ichimura, Tetsuhiro*; Sugita, Yutaka

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 64(3), p.163 - 167, 2022/03

no abstracts in English

Journal Articles

RBS study of disordering of Fe$$_{3-x}$$Mn$$_{x}$$Si/Ge(111) heteroepitaxial interfaces

Noguchi, 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:0.02

Journal Articles

Ion beam analysis of quaternary Heusler alloy Co$$_{2}$$(Mn$$_{1-x}$$Fe$$_{x}$$)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:0.02

JAEA Reports

Investigation of the long term corrosion resistance of the overpack FY2006 (Contract research)

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.

JAEA Reports

Investigation of the long term corrosion resistance of the overpack (Contract research)

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.

Journal Articles

Removal of co-deposited layers by excimer lasers

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:32.68(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 $$mu$$m/pulse was achieved for the JT-60 co-deposited layers at the energy density of 11 J/cm$$^{2}$$ 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$$^{2}$$, 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.

Journal Articles

Tritium recovery from co-deposited layers using 193-nm laser

Shu, Wataru; Kawakubo, Yukio*; Nishi, Masataka

Applied Physics A, 76(3), p.421 - 425, 2003/03

 Times Cited Count:16 Percentile:55.39(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$$^{2}$$, 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$$^{2}$$), but reached to 1.1 $$mu$$m/pulse at the laser energy density of 7.6 J/cm$$^{2}$$. 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$$^{2}$$ decreased from 3570 K at the initial irradiation to 2550 K at 1000th pulse of the irradiation.

Journal Articles

Ablative removal of codeposits on JT-60 carbon tiles by an excimer laser

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:81.33(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Tritium decontamination of TFTR D-T plasma facing components using ultra violet laser

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

Oral presentation

RBS study of disordering of Fe$$_{3-x}$$Mn$$_{x}$$Si/Ge(111) heteroepitaxial interfaces

Noguchi, Masaya*; Hirata, Tomoaki*; Kawakubo, Yuki*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito

no journal, , 

Oral presentation

Ion beam analysis of quaternary Heusler alloy Co$$_{2}$$(Mn$$_{1-x}$$Fe$$_{x}$$)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

Oral presentation

Evaluation of interfaces of Fe$$_{3}$$Si epitaxially grown on Si(111) with ion channeling

Kawakubo, Yuki*; Noguchi, Masaya*; Hirata, Tomoaki*; Maeda, Yoshihito; Sakai, Seiji; Narumi, Kazumasa

no journal, , 

no abstracts in English

Oral presentation

Ion channeling analysis of axial orientation of Fe$$_{3}$$Si on Si(111) heterointerface

Kawakubo, Yuki*; Noguchi, Masaya*; Mizuki, Tatsuya*; Narumi, Kazumasa; Sakai, Seiji; Hamaya, Kohei*; Miyao, Masanobu*; Maeda, Yoshihito

no journal, , 

no abstracts in English

Oral presentation

Enhancement of IR-light emission from $$beta$$-FeSi$$_{2}$$ nanocrystals by Cu doping

Hirata, 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

Oral presentation

RBS study of behavior of Cu diffusion in $$beta$$-FeSi$$_{2}$$

Noguchi, 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

Oral presentation

Ion channeling analysis of disordering behavior at Fe$$_{3}$$Si(111)/Si(111) heteroepitaxial interfaces

Noguchi, Masaya*; Kawakubo, Yuki*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito

no journal, , 

no abstracts in English

16 (Records 1-16 displayed on this page)
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