M. Ueyama

Sumitomo Electric Industries (Japan)

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K. Sato

The University of Tokyo

Kazuhiko Hayashi

Osaka University

K. Ohmatsu

Sumitomo Electric Industries (Japan)

Takeshi Hikata

Sumitomo Electric Industries (Japan)

J. Fujikami

Sumitomo Electric Industries (Japan)

S. Hahakura

Sumitomo Electric Industries (Japan)

Takeshi Kato

Osaka National Hospital

N. Ayai

Sumitomo Electric Industries (Japan)

K. Ohkura

Sumitomo Electric Industries (Japan)

S. Kobayashi

Ashikaga University

Cooperative Institutions

Sumitomo Electric Industries (Japan)

Sumitomo Electric Industries (United States)

Kyushu University

Yokohama National University

The University of Tokyo

Nagoya University

Kyoto University

Tohoku University

International Superconductivity Technology Center

Massachusetts Institute of Technology

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Bismuth superconducting wires and their applications

Cryogenics (1993)

K. Sato N. Shibuta H. Mukai Takeshi Hikata M. Ueyama

Bismuth

Liquid nitrogen

10.1016/0011-2275(93)90038-p

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Citations (51)

Influence of substrate magnetism of coated conductors on critical current distribution measurement using magnetic knife method

Physica C Superconductivity (2008)

Zhenan Jiang Naoyuki Amemiya Taiki Onuma Takeshi Kato M. Ueyama

Magnetism

10.1016/j.physc.2008.05.241

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AC Loss of Transposed HTS Cable Conductors

Springer eBooks (1998)

Nobuhiro Saga S. Hahakura J. Fujikami M. Ueyama T. Kaneko

10.1007/978-4-431-66879-4_211

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Preparation of Bipbsrcacuo Superconductors by Laser Pedestal Growth Method

MRS Proceedings (1989)

Kazuhiko Hayashi H. Nonoyama M. Ueyama M. Nagata Hajime Hitotsuyanagi

Pedestal

10.1557/proc-169-309

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AC loss reduction in Bi2223 multifilamentary tapes by inter-filament resistive barrier; Fuiramento kan eno koteiko baria donyu ni yoru Bi2223 tashi tepu senzai no teikoryu sonshitsuka

N Amemiya O. Tsukamoto M. Ciszek M. Torii Etsuo Mizushima

By the introduction of the high resistivity barrier, the research, which suppresses the combination between filaments, is advanced. This time, barrier wire rod using some barriers materials was produced experimentally, and the resistivity evaluation of superconducting characteristic and barrier layer of the wire rod was carried out. MgO as a barrier material Al203 and Bi2201 are used. It is possible to use Bi2201 as a barrier material without showing the superconducting characteristic in 77K. (NEDO)

Resistive touchscreen

Barrier layer

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Development of 200 meter HoBCO Coated Conductors on Ni-Alloy Textured Substrates

IEEE Transactions on Applied Superconductivity (2007)

K. Ohmatsu M. Ueyama K. Hasegawa S. Hahakura Takeshi Kato

(Ho ₁ Ba ₂ Cu ₃ O _x ) (HoBCO) coated conductors on textured Ni-alloy substrates were developed by using pulsed laser deposition (PLD). Hetero-epitaxial growth of CeO ₂ /YSZ/CeO ₂ was used to introduce in-plane alignment for buffer layers. CeO ₂ seed and cap layers were deposited by RF sputtering. YSZ diffusion layer was deposited by PLD. The most advantage of these buffer layers are high growth rate and large deposition area by using textured substrate. As for the HoBCO deposition, a production speed of 20 m/h with growth rate of 2-3 mum per minute was demonstrated in our PLD process. By optimizing the deposition temperature, lc and Jc of the short samples reached 265 A/cm-width and 5.6 MA/cm ² at 77 K, 0 T, respectively. Long length HoBCO conductors over 200 m were performed by using reel to reel tape transfer system of each process.

10.1109/tasc.2007.899552

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Citations (10)

Coils, Power Leads, Busbars, and Cables

CRC Press eBooks (1996)

K. Sato K. Ohkura Kazuhiko Hayashi Takeshi Hikata Takashi Kaneko

After obtaining high-7c (critical current density) properties with silver-sheathed bismuth (2223 phase) wire [1], a long-wire fabrication became the key issue for actual application. High-7c long wires of 1-km-class length are being developed. These wires have a multifilamentary configuration and are flexible. Prototypes of power application devices were made and evaluated. Such prototypes include current leads, busbars, flexible cable conductors, and refrigerator cooled magnets. Among these prototypes, 2000-A current carrying leads were developed and have been used for synchrotron radiation (SR) equipment at Harima Research Laboratories of Sumitomo Electric Industries, Ltd. This machine has been operated successfully for over a year from December 1993.

Busbar

10.1201/9781482273472-25

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Development of Ag-sheathed Bi-2223 superconducting wires and their applications

IEEE Transactions on Applied Superconductivity (2001)

Kazuhiko Hayashi Takeshi Hikata T. Kaneko M. Ueyama A. Mikumo

Silver-sheathed multifilamentary BiPbSrCaCuO 2223 superconducting wires with long length and high Jc of over 3/spl times/10/sup 4/ A/cm (77.3 K, 0 T) were developed by using the powder-in-tube method. For future industrial applications, high Jc with high Ic wires, high strength wires and low AC loss wires were also developed for large scale magnet applications and electric apparatus for AC use. In the case of AC conductor, twist effect was investigated in order to reduce the wire AC loss, PVF coating technology was applied to high strength wire. PVF coating technology made it possible to obtain amperage parallel conductor with low AC loss, because each strand is electrically insulated. As a progress of technology, we could fabricate many application prototypes. In the high amperage conductor application, current leads and cable conductors were developed. In the magnet application, pancake magnets cooled by GM refrigerator and operated at around 20 K were developed, We have also developed the transformer as an AC application operated in the liquid nitrogen.

Liquid nitrogen

10.1109/77.919763

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Citations (36)

Development of high performance Ag sheathed Bi2223 wire

Physica C Superconductivity (2004)

Takeshi Kato S. Kobayashi K. Yamazaki K. Ohkura M. Ueyama

10.1016/j.physc.2004.05.006

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Citations (51)

Ac losses in YBa{sub 2}Cu{sub 3}O{sub 7} and Bi{sub 2}Sr{sub 2}Ca{sub 2}Ci{sub 3}O{sub 10} superconductors at power frequencies

J. Orehotsky Kevin Reilly M. Suenaga Takeshi Hikata M. Ueyama

Ac losses of sintered and melt-textured YBa{sub 2}Cu{sub 3}O{sub 7} bars and powder-in-a-tube processed Bi{sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10} tapes were measured at 4.2, 65, 70 and 77 K and at 15--180 Hz. In general, the results are well described by the critical state model for the ac losses. However, the losses for the Bi{sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10} tapes at 4.2 K exhibited significant contributions from the eddy currents in the Ag sheath.

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