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27 results on '"Fukushima, Keiji"'

5. TRUQ (TRansformation-Heat Based Up-Quenching) for high-performance Nb[subscript 3]Al superconductors

Author

Banno, Nobuya, Fukushima, Keiji, Takeuchi, Takao, Fukuzaki, Tomokazu, and Wada, Hitoshi

Subjects
Superconducting magnets -- Research, Electrical equipment and supplies industry -- Research, Electrical engineering, Business, Electronics, Electronics and electrical industries, European Organization for Nuclear Research -- Conferences, meetings and seminars
Abstract

Heat-treatment conditions and procedures having to do with transformation-heat based up-quenching (TRUQ) processes of Nb[subscript 3]Al coils are investigated, and results are summarized.

Published
2002

6. Persistent-mode operation of a 920 MHz high-resolution NMR magnet

Author

Kiyoshi, Tsukasa, Sato, Akio, Takeuchi, Takao, Itoh, Kikuo, Matsumoto, Shinji, Ozaki, Osamu, Fukushima, Keiji, Wada, Hitoshi, Yoshikawa, Masatoshi, Kamikado, Takeshi, Ito, Satoshi, Miki, Takashi, Hase, Takashi, Hamada, Mamoru, Hayashi, Seiji, Kawate, Yoshio, and Hirose, Ryoichi

Subjects
Japan. National Institute for Materials Science -- Research, Superconducting magnets -- Research, Electrical equipment and supplies industry -- Research, Nuclear magnetic resonance -- Research, Electrical engineering, Business, Electronics, Electronics and electrical industries, European Organization for Nuclear Research -- Conferences, meetings and seminars
Abstract

Research involving a high-field nuclear magnetic resonance (NMR) magnet is reported. The work was accomplished at the Tsukuba Magnet Laboratory at the National Institute for Materials ScienceTsukuba, Ibaraki, Japan.

Published
2002

7. Persistent-mode operation in a cryocooler-cooled HTS magnet

Author

Koyanagi, Kei, Matsumoto, Shinji, Fukushima, Keiji, Kiyoshi, Tsukasa, and Wada, Hitoshi

Subjects
Superconducting magnets -- Research, Electrical equipment and supplies industry -- Research, Solenoids -- Research, Electrical engineering, Business, Electronics, Electronics and electrical industries, European Organization for Nuclear Research -- Conferences, meetings and seminars
Abstract

Results involving switching behaviors of the persistent-current switch (PCS), and of field-decay behaviors in long-term operations, are reported. Compensation of magnetic fields, using a NbTi cylinder, is also discussed.

Published
2002

12. Supercritical Hydrothermal Synthesis of Nanoparticles for Hybrid Materials—Super Hybrid Materials through Organic Surface Modification—

Author

ADSCHIRI, Tadafumi, primary, ARAI, Tomohiro, additional, ISHIKAWA, Yosizumi, additional, UENO, Masataka, additional, UEDA, Masataka, additional, OKADA, Takuya, additional, OSHIMA, Hidenori, additional, NAKAGAWA, Takayuki, additional, FUKUSHIMA, Keiji, additional, MAEDA, Shigeyuki, additional, MIYATA, Kenji, additional, MORISHITA, Takehiro, additional, YAMAGATA, Toshitaka, additional, TAKAMI, Seiichi, additional, AOKI, Nobuaki, additional, ARITA, Toshihiko, additional, HOJO, Daisuke, additional, MINAMI, Kimitaka, additional, TOGASHI, Takanari, additional, ASAHINA, Shunsuke, additional, TAGUCHI, Minori, additional, UMETSU, Mitsuo, additional, OHARA, Satoshi, additional, and NAKA, Takashi, additional

Published
2012
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24. Persistent-Mode Operation of a Cryocooler-Cooled HTS Magnet.

Author

Koyanagi, Kei, Matsumoto, Shinji, Fukushima, Keiji, Kiyoshi, Tsukasa, and Wada, Hitoshi

Subjects
SUPERCONDUCTING magnets, HIGH temperature superconductors, COOLING
Abstract

Examines the persistent-mode operation of a high temperature superconducting magnet cooled by a cryocooler. Thermal conductance; Decay behaviors; Temperature increase of the magnet due to persistent current switch.

Published
2002
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27. Persistent Mode Operation of Bi2Sr2CaCu2Ox/AgStacked Double Pancake Coils with Superconducting Joints

Author

Fukushima, Keiji, Okada, Michiya, Sato, Junichi, Kiyoshi, Tsukasa, Kumakura, Hiroaki, Togano, Kazumasa, and Wada, Hitoshi

Abstract

A persistent current mode magnet was successfully fabricated using Bi2Sr2CaCu2Ox/Ag tapes. The magnet system consisted of four Bi2Sr2CaCu2Ox/Ag double pancake coils as a magnet and a noninductively wound Bi2Sr2CaCu2Ox/Ag-Au single pancake coil as a persistent current switch. The pancakes were stacked and jointed using a butt-jointing method to form a superconducting closed loop. Persistent current mode operation of the magnet was initiated in liquid helium, trapping a magnetic field of 1 T which corresponds to a loop current of 134 A. The voltage-current (V-I) characteristic of the closed loop was estimated from the decay of the trapped field. An index number in the V-Icurve, n, above 30 and a loop resistance of 2×10-10? were observed for the loop current above 30 A after 116 hours.

Published
1997
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