Itaru Inoue
The Furukawa Electric Co., Ltd.
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Featured researches published by Itaru Inoue.
Archive | 1992
Itaru Inoue; Takuya Suzuki; Masaru Ikeda; A. Yamamoto; T. Kondo
Development of high strength aluminum-stabilized superconductor for the SDC superconductor which has appropriate RRR has been carried out. Requried properties for aluminum matrix (yield strength at 77K >6.5kgf/mm2 and RRR ~500) have been obtained by using Al-Zn alloy and cold-working. In the production of 1/3-sized superconductor by way of experiment, the reduction ratio of cold-working has been restricted below 15%. Based on investigations of Al alloys and 1/3-sized experiment, full-sized superconductor for the SDC detector has been designed and produced by way of experiment. The properties of aluminum matrix obtained satisfy the specification after final curing heat treatment.
Cryogenics | 1995
O. Miura; Itaru Inoue; Takuya Suzuki; Kaname Matsumoto; Y. Tanaka; Kazuo Funaki; Masataka Iwakuma; Kaoru Yamafuji; Teruo Matsushita
Abstract A 2.5 T/100kVA a.c. superconducting magnet has been developed using Nb-Ti superconducting wire with artificially introduced pins. Investigations have been conducted regarding the suitability of critical current density J c design using artificial pins and the effectiveness of magnets using wires with high J c . Studies on pin design suggested that the maximum pinning force density F p would be reached at a magnetic field of 2.5 T. As anticipated, the maximum F p was achieved at 2.5T, and a high J c of 4.7 × 10 9 A m −2 was obtained. Using an a.c. magnet fabricated from this wire, current operation at 60 Hz and 4.2 K was effected, and steady state operation at a capacity of 104.8 kVA, a current of 105.8 A rms and a voltage of 991.2 V rms was achieved. At the same time, a central magnetic field of 2.5 T was obtained. In addition, it was demonstrated that the total a.c. losses were 4.8 W at a central magnetic field amplitude B 0 of 2 T, a mere 0.007% with respect to the capacity of 69 kVA and much lower than in a.c. magnets of the 100 kVA class made using conventional a.c. wires. This confirmed the effectiveness of reducing magnet size through the use of wires having high current density.
Cryogenics | 1977
Yasuzo Tanaka; Yoshio Furuto; Masaru Ikeda; Itaru Inoue; Takuya Suzuki; S. Meguro
Abstract This paper summarizes our research on newly-developed multifilamentary V 3 Ga and Nb 3 Sn compound superconductors, including their design, processing, and characteristics such as mechanical and superconducting properties, and coil performance.
IEEE Transactions on Applied Superconductivity | 2012
Satoshi Awaji; Ying Hou; Hidetoshi Oguro; Kazuo Watanabe; Itaru Inoue; Hisaki Sakamoto; Shinya Yasunaga; Jin Ryu
We measured the time evolution of voltage and temperature of a CVD-Y123 coated conductor monolayer coil with Cu stabilizer under the cryocooled condition. The thermal runaway occurred locally at operate currents of 1.05-1.3 at 38 K and 1-10 T. In this case, the hot spot originated from the inhomogeneity of was observed. The thermal runaway generated from different parts of the tape at high and low fields at 38 K, respectively. This is due to the different heating behavior related to the distribution. The critical heating power of the thermal runaway obtained in this study were about 30 mW at 38 K and 10 T. It weakly depends on magnetic filed but is independent to the temperature. The analysis suggests that the cooling condition for the transient phenomena such as the thermal runaway is poor.
IEEE Transactions on Magnetics | 1994
Hirofumi Kasahara; Shinji Torii; Shirabe Akita; Kiyotaka Uyeda; Tetsuji Ogawa; Yoshimitsu Ikeno; Itaru Inoue; Takashi Saito
Critical currents of Nb/sub 3/Sn cabled superconductors were measured under cyclic mechanical compressive force of 30 MPa up to 10000 times. The conductors were developed for a superconducting generator under the Super-GM project. The conductors were designed to apply the field winding of the 70 MW-class superconducting generator. The 10000 repetitions of force application simulate 30 years of centrifugal and electromagnetic force produced by the daily start-and-stop (DSS) operation of the superconducting generator. In the test facility constructed at the Akagi Testing Center of the Central Research Institute of Electric Power Industry (CRIEPI), mechanical compressive force is generated by the cyclic fatigue test machine, which can generate 100 kN of force and is located on top of a cryostat at room temperature. Measured critical currents of two types of Nb/sub 3/Sn conductor did not change throughout the test. >
Archive | 1980
Yoshio Furuto; Y. Tanaka; S. Meguro; Takuya Suzuki; Itaru Inoue
Various types of multifilamentary compound superconductors have been developed consistently for the past ten years at the Furukawa Electric Company.
Cryogenics | 1971
Itaru Inoue; Yoshinori Nagasu; Keizo Kosugi; Takuya Suzuki
Journal of Cryogenics and Superconductivity Society of Japan | 1976
Yasuzo Tanaka; Yoshio Furuto; Masaru Ikeda; Itaru Inoue; Takuya Suzuki; S. Meguro
Journal of Cryogenics and Superconductivity Society of Japan | 1997
Sakaru Endoh; Itaru Inoue; Masaru Ikeda; Hitoshi Shimizu; S. Meguro; Hisaki Sakamoto; Yasuzo Tanaka; M. Nishi; Takaaki Isono; Yoshihiko Nunoya; K. Yoshida; Hiroshi Tsuji
Ieej Transactions on Fundamentals and Materials | 1995
O. Miura; Itaru Inoue; Kaname Matsumoto; Yasuzo Tanaka