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Otsuka, Satoshi; Kaito, Takeji; Kim, S.-W.; Inoue, Masaki; Asayama, Tai; Onuma, Masato*; Suzuki, Junichi
Materials Transactions, 50(7), p.1778 - 1784, 2009/06
Times Cited Count:14 Percentile:57.89(Materials Science, Multidisciplinary)Agui, Akane; Asahi, Toru*; Sayama, Junichi*; Mizumaki, Masaichiro*; Tanaka, Masahito*; Osaka, Tetsuya*
Journal of Magnetism and Magnetic Materials, 320(22), p.3015 - 3018, 2008/11
Times Cited Count:1 Percentile:5.70(Materials Science, Multidisciplinary)no abstracts in English
Tanaka, Masahito*; Asahi, Toru*; Agui, Akane; Mizumaki, Masaichiro*; Sayama, Junichi*; Osaka, Tetsuya*
Journal of Physics D; Applied Physics, 41(5), p.055003_1 - 055003_4, 2008/03
Times Cited Count:5 Percentile:22.12(Physics, Applied)no abstracts in English
Agui, Akane; Mizumaki, Masaichiro*; Asahi, Toru*; Matsumoto, Koji*; Morikawa, Tsuyoshi*; Sayama, Junichi*; Osaka, Tetsuya*
Journal of Physics and Chemistry of Solids, 68(11), p.2148 - 2152, 2007/11
Times Cited Count:9 Percentile:40.74(Chemistry, Multidisciplinary)no abstracts in English
Motojima, Osamu*; Yamada, Hiroshi*; Komori, Akio*; Oyabu, Nobuyoshi*; Muto, Takashi*; Kaneko, Osamu*; Kawahata, Kazuo*; Mito, Toshiyuki*; Ida, Katsumi*; Imagawa, Shinsaku*; et al.
Nuclear Fusion, 47(10), p.S668 - S676, 2007/10
Times Cited Count:35 Percentile:73.23(Physics, Fluids & Plasmas)The performance of net-current free heliotron plasmas has been developed by findings of innovative operational scenarios in conjunction with an upgrade of the heating power and the pumping/fuelling capability in the Large Helical Device (LHD). Consequently, the operational regime has been extended, in particular, with regard to high density, long pulse length and high beta. Diversified studies in LHD have elucidated the advantages of net-current free heliotron plasmas. In particular, an internal diffusion barrier (IDB) by a combination of efficient pumping of the local island divertor function and core fuelling by pellet injection has realized a super dense core as high as 510
m
, which stimulates an attractive super dense core reactor. Achievements of a volume averaged beta of 4.5% and a discharge duration of 54 min with a total input energy of 1.6 GJ (490 kW on average) are also highlighted. The progress of LHD experiments in these two years is overviewed by highlighting IDB, high-beta and long pulse.
Motojima, Osamu*; Yamada, Hiroshi*; Komori, Akio*; Oyabu, Nobuyoshi*; Kaneko, Osamu*; Kawahata, Kazuo*; Mito, Toshiyuki*; Muto, Takashi*; Ida, Katsumi*; Imagawa, Shinsaku*; et al.
Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 12 Pages, 2007/03
The performance of net-current free Heliotron plasmas has been developed by findings of innovative operational scenarios in conjunction with an upgrade of the heating power and the pumping/fueling capability in the Large Helical Device (LHD). Consequently, the operational regime has been extended, in particular, with regard to high density, long pulse length and high beta. Diversified studies in LHD have elucidated the advantages of net-current free heliotron plasmas. In particular, an Internal Diffusion Barrier (IDB) by combination of efficient pumping of the local island divertor function and core fueling by pellet injection has realized a super dense core as high as 510
m
, which stimulates an attractive super dense core reactor. Achievements of a volume averaged beta of 4.5 % and a discharge duration of 54-min. with a total input energy of 1.6 GJ (490 kW in average) are also highlighted. The progress of LHD experiments in these two years is overviewed with highlighting IDB, high
and long pulse.
Agui, Akane; Asahi, Toru*; Sayama, Junichi*; Kawaji, Jun*; Mizumaki, Masaichiro*; Tanaka, Masahito*; Osaka, Tetsuya*
Journal of Physics D; Applied Physics, 39(14), p.2881 - 2885, 2006/07
Times Cited Count:1 Percentile:4.30(Physics, Applied)no abstracts in English
Agui, Akane; Mizumaki, Masaichiro*; Asahi, Toru*; Sayama, Junichi*; Matsumoto, Koji*; Morikawa, Tsuyoshi*; Matsushita, Tomohiro*; Osaka, Tetsuya*; Miura, Yoshimasa*
Journal of Alloys and Compounds, 408-412, p.741 - 745, 2006/02
Times Cited Count:7 Percentile:45.42(Chemistry, Physical)no abstracts in English
Agui, Akane; Mizumaki, Masaichiro*; Asahi, Toru*; Sayama, Junichi*; Matsumoto, Koji*; Morikawa, Tsuyoshi*; Nakatani, Takeshi; Matsushita, Tomohiro*; Osaka, Tetsuya*; Miura, Yoshimasa*
Transactions of the Magnetics Society of Japan, 4(4-2), p.326 - 329, 2004/11
The electronic and spin state of the perpendicular magnetization film TbFe
Co
was investigated by means of magnetic circular dichroism spectroscopy for each element. The samples are Tb
Fe
Co
while the ratio of a rare-earth metal Tb to transition metals Fe and Co is constant, the composition ratio of Fe and Co is changed. Changing the ratio, we estimated the expected orbital moments
of Tb 4f electrons. The macroscopic magnetic property is studied from the microscopic point of view.
Agui, Akane; Mizumaki, Masaichiro*; Matsushita, Tomohiro*; Asahi, Toru*; Kawaji, Jun*; Sayama, Junichi*; Osaka, Tetsuya*
Journal of Applied Physics, 95(12), p.7825 - 7831, 2004/06
Times Cited Count:6 Percentile:27.38(Physics, Applied)The electronic and spin states of [Co/Pd] multilayered perpendicular magnetization films with various seedlayers have been investigated by means of soft X-ray absorption and magnetic circular dichroism spectroscopy at the Co -edges. The expectation values of the orbital angular momentum
and the spin angular momentum
of Co atom in the [Co/Pd] multilayered film were estimated using the sum rule. It was found that the seedlayer changes macroscopic magnetic properties of the [Co/Pd] multilayered film without affecting the electronic and spin states of the upper layers of Co.
Agui, Akane; Mizumaki, Masaichiro*; Asahi, Toru*; Kagomiya, Isao*; Matsumoto, Koji*; Sayama, Junichi*; Morikawa, Tsuyoshi*; Osaka, Tetsuya*
no journal, ,
no abstracts in English
Agui, Akane; Mizumaki, Masaichiro*; Asahi, Toru*; Sayama, Junichi*; Kagomiya, Isao*; Matsumoto, Koji*; Morikawa, Tsuyoshi*; Osaka, Tetsuya*
no journal, ,
no abstracts in English
Mizumaki, Masaichiro*; Agui, Akane; Sayama, Junichi*; Tanaka, Masahito*; Asahi, Toru*; Osaka, Tetsuya*
no journal, ,
no abstracts in English
Tanaka, Masahito*; Asahi, Toru*; Sayama, Junichi*; Agui, Akane; Mizumaki, Masaichiro*; Osaka, Tetsuya*
no journal, ,
no abstracts in English
Tanaka, Masahito*; Asahi, Toru*; Agui, Akane; Mizumaki, Masaichiro*; Sayama, Junichi*; Osaka, Tetsuya*
no journal, ,
We examined the macroscopic and element selective magnetic properties by Kerr hysteresis loop and X-ray magnetic circular dichroism (MCD) spectroscopy, respectively, of [TbCo
]
/Pd multilayered films and Tb
Co
single layered films with several TbCo layer thicknesses. We found that the macroscopic magnetic properties of TbCo/Pd and TbCo films were dependent on the TbCo layer thickness by Kerr effect measurement. We estimated the
Lz
,
Sz
and
Lz
/
Sz
values from MCD measurements at Co L2,3 edges. The values of
Lz
and
Sz
of both types of films were the almost same each other, while the clear distinction of Kerr effects was observed.
Agui, Akane; Mizumaki, Masaichiro*; Asahi, Toru*; Matsumoto, Koji*; Morikawa, Tsuyoshi*; Tanaka, Masahito*; Sayama, Junichi*; Osaka, Tetsuya*
no journal, ,
no abstracts in English
Mizumaki, Masaichiro*; Agui, Akane; Tanaka, Masahito*; Sayama, Junichi*; Asahi, Toru*; Osaka, Tetsuya*
no journal, ,
no abstracts in English
Otsuka, Satoshi; Kaito, Takeji; Kim, S.-W.; Inoue, Masaki; Asayama, Tai; Suzuki, Junichi; Onuma, Masato*
no journal, ,
With a view to making clear the correlation between microstructure and high-temperature strength of 9Cr-ODS ferritic/martensitic duplex steel, the correlation between matrix ferrite proportion and high-temperature strength was quantitatively evaluated. The evaluated results were compared to the nano-structure data such as oxide particle diameter and number density evaluated in the companion report. Both the decreasing excess oxygen and the increasing titanium provides for enhancement of ferrite proportion, which is accompanied by the increasing number density of nano-scale oxide particles, thus appreciably improving high-temperature creep strength. This result is consistent with the previous TEM observation results showing that nano-scale oxide particles are more densely dispersed in ferrite than in tempered-martensite. The increase of ferrite proportion is shown to certainly improve high-temperature creep strength even though the number density of nano-scale oxide particles is kept constant.
Onuma, Masato*; Suzuki, Junichi; Otsuka, Satoshi; Kaito, Takeji; Kim, S.-W.; Inoue, Masaki; Asayama, Tai
no journal, ,
This study discussed the interrelation between chemical composition and nano-scale oxide particle dispersion of the 9Cr-ODS steel for fast reactor fuel cladding application using small angle scattering (SAS) analysis, which is viewed as a strong tool for quantitative evaluation of nano-structure such as particle diameter and number density. Decreasing excess oxygen as well as increasing titanium is shown to provide the considerable increase of nano-scale particle population as well as the reduction of particle diameter. The type of these particles are identified to be YTi
O
and the number density is evaluated to be in the range between 1E17 and 1E19 (cm
). The elevation of hot-extrusion temperature from 1150
C to 1200
C reduced 20% of nano-scale oxide particle number density.
Otsuka, Satoshi; Suzuki, Junichi; Kaito, Takeji; Kim, S.-W.; Inoue, Masaki; Asayama, Tai; Onuma, Masato*
no journal, ,
The effect of chemical composition on high-temperature creep strength of 9Cr-ODS steel and its relation to nano/micro scale microstructure were discussed. It was definitely demonstrated that high-temperature creep strength of 9Cr-ODS steel can be effectively improved by the increasing nano-scale oxide particle population-i.e. increasing oxide particle dispersion strengthening-as well as the formation of appropriate amount of ferrite phase in tempered martensite matrix.