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Nabara, Yoshihiro; Hemmi, Tsutomu; Kajitani, Hideki; Ozeki, Hidemasa; Iguchi, Masahide; Nunoya, Yoshihiko; Isono, Takaaki; Matsui, Kunihiro; Koizumi, Norikiyo; Tsutsumi, Fumiaki; et al.
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no abstracts in English
Sn cables for ITER central solenoid (CS) coilTakahashi, Yoshikazu; Nabara, Yoshihiro; Ozeki, Hidemasa; Hemmi, Tsutomu; Nunoya, Yoshihiko; Isono, Takaaki; Oshikiri, Masayuki; Tsutsumi, Fumiaki; Uno, Yasuhiro; Shibutani, Kazuyuki*; et al.
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Japan Atomic Energy Agency (JAEA) is procuring all amounts of NbSn conductors for Central Solenoid (CS) in the ITER project. Before start of mass-productions, the conductor should be tested to confirm superconducting performance in the SULTAN facility, Switzerland. The original design of cabling twist pitches is 45-85-145-250-450 mm, called normal twist pitch (NTP). The test results of the conductors with NTP was that current shearing temperature (Tcs) is decreasing due to electro-magnetic (EM) load cycles. On the other hand, the results of the conductors with short twist pitches (STP) of 25-45-80-150-450 show that the Tcs is stabilized during EM load cyclic tests. Because the conductors with STP have smaller void fraction, higher compaction ratio during cabling is required and possibility of damage on strands increases. The technology for the cables with STP was developed in Japanese cabling suppliers. The several key technologies will be described in this paper.
Takano, Katsutoshi; Matsui, Kunihiro; Koizumi, Norikiyo
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no abstracts in English
Koizumi, Norikiyo; Matsui, Kunihiro; Hemmi, Tsutomu; Kajitani, Hideki; Takano, Katsutoshi; Yamane, Minoru; Iguchi, Masahide
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no abstracts in English
Ozeki, Hidemasa; Hamada, Kazuya; Takahashi, Yoshikazu; Nunoya, Yoshihiko; Kawano, Katsumi; Oshikiri, Masayuki; Saito, Toru; Isono, Takaaki; Teshima, Osamu*; Matsunami, Masahiro*
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Iguchi, Masahide; Hemmi, Tsutomu; Chida, Yutaka*; Morimoto, Masaaki; Hong, Y.-S.*; Nishi, Hiroshi; Koizumi, Norikiyo; Tokai, Daisuke*; Niimi, Kenichiro*; Yamada, Hirokazu*
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no abstracts in English
Kamiya, Koji; Onishi, Yoshihiro; Koide, Yoshihiko; Yoshida, Kiyoshi; Michel, F.*
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A final specification of the JT-60SA helium refrigerator was agreed between EU and Japan on September 2012, and the procurement arrangement was signed in November 2012. The JT-60SA helium refrigerator consists of the cold box, auxiliary cold box, helium compressors, and helium gas storage tanks. JT-60SA helium refrigerator cools superconducting coils, structures, high temperature superconducting current leads, thermal shield, and cryopanel. A cooling power of the refrigerator is approximately 9 kW at 4.5 K. This study reports detailed specification and schedule of the JT-60SA helium refrigerator.
Murakami, Haruyuki; Kizu, Kaname; Tsuchiya, Katsuhiko; Koide, Yoshihiko; Yoshida, Kiyoshi; Obana, Tetsuhiro*; Takahata, Kazuya*; Hamaguchi, Shinji*; Natsume, Kyohei*; Imagawa, Shinsaku*; et al.
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no abstracts in English
Hong, Y.-S.*; Iguchi, Masahide; Morimoto, Masaaki; Nakahira, Masataka; Hemmi, Tsutomu; Nishi, Hiroshi; Koizumi, Norikiyo
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