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Oguri, Hidetomo; Hasegawa, Kazuo; Ito, Takashi; Chishiro, Etsuji; Hirano, Koichiro; Morishita, Takatoshi; Shinozaki, Shinichi; Ao, Hiroyuki; Okoshi, Kiyonori; Kondo, Yasuhiro; et al.
Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.389 - 393, 2014/10
no abstracts in English
Koizumi, Norikiyo; Nunoya, Yoshihiko; Takayasu, Makoto*; Sugimoto, Makoto; Nabara, Yoshihiro; Oshikiri, Masayuki*; CS Model Coil Test Group
Teion Kogaku, 38(8), p.399 - 409, 2003/08
A NbAl insert was developed to demonstrate the applicability of a NbAl conductor and wind-and-react method to a TF coil of a fusion reactor by artificially applying 0.4% bending strain to the conductor after its heat treatment. The critical current test results show that the effective strains applied to the strands is almost zero. Then, the validity of the react-and-wind method was demonstrated. In addition, while an unexpected strain, which was proportional to electromagnetic force, was observed in the same scale NbSn conductor, such strain did not exist in the NbAl conductor. This shows a NbAl conductor is suitable to the application to large magnets, such as the TF coil. Furthermore, the effect of the current transfer among the strands on the critical current evaluation is studied by developing a numerical analysis code, KORO. The results figure out that the critical current of a large cable-in-conduit conductor can be easily evaluated assuming the uniform current distribution if the conductance among the strands is 10E5 S/m or less.
Kato, Takashi; Tsuji, Hiroshi; Ando, Toshinari; Takahashi, Yoshikazu; Nakajima, Hideo; Sugimoto, Makoto; Isono, Takaaki; Koizumi, Norikiyo; Kawano, Katsumi; Oshikiri, Masayuki*; et al.
Fusion Engineering and Design, 56-57, p.59 - 70, 2001/10
Times Cited Count:17 Percentile:74.75(Nuclear Science & Technology)no abstracts in English
Tsuji, Hiroshi; Okuno, Kiyoshi*; Thome, R.*; Salpietro, E.*; Egorov, S. A.*; Martovetsky, N.*; Ricci, M.*; Zanino, R.*; Zahn, G.*; Martinez, A.*; et al.
Nuclear Fusion, 41(5), p.645 - 651, 2001/05
Times Cited Count:57 Percentile:83.34(Physics, Fluids & Plasmas)no abstracts in English
Takayasu, Shunichi*; Yoshizaki, Jumpei*; Okube, Maki*; Toyoda, Takeshi*; Igawa, Naoki; Sasaki, Satoshi*
no journal, ,
Site preferences of Ti and Mn and the magnetic structure of M-type BaTiMnFeO ferrite were analyzed using the X rays and neutron powder diffraction method. The intensity difference on the magnetic scattering was clearly observed below and above the c, showing the ferrimagnetic spin arrangement along with the axis. Site-occupancy refinements give the results that Ti ions occupy the 41 (24%), 2 (15%) and 2 (15%) sites, while Mn ions prefer to 42 (24%) and 12 (24%). Magnetic moments were obtained from the Rietveld refinements, which are 3.56, 3.37, -3.86, -3.72 and 3.68 at = 8 K for 2, 2, 41, 42 and 12 sites, respectively.
Takayasu, Shunichi*; Yoshizaki, Jumpei*; Okube, Maki*; Toyoda, Takeshi*; Igawa, Naoki; Sasaki, Satoshi*
no journal, ,
Hexagonal barium ferrites have been traditionally used as permanent magnets and microwave devices because of their high coercivity and large uniaxial anisotropy. It is recognized that the magnetic anisotropy can be optimized by Fe ion for several magnetic and non-magnetic ions, which makes M-type ferrites suitable for microwave absorber in 1 - 75 GHz range. In this study to use neutron and X-ray powder diffraction, site preference and magnetic structure of iron sites on BaTiCoFeO are examined.