Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Studies on Bi-(Pb)-Sr-Ca-Cu-O Superconducting Tapes
Abstract Bi-(Pb)-Sr-Ca-Cu-O superconductor was fabricated into tapes without a sheath and into multifilamentary tapes with a Ag sheath. These specimens were prepared by combination and repetition of cold pressing or cold rolling and sintering. In these specimens, the c axis tended to align well. Measurements of magnetization and critical current density, Jc, in magnetic fields up to 23T were made. The magnetization measurement revealed that, at 4.2K, these tape specimens had excellent Jc-H characteristics while, at 77K, the flux pinning force in tne tape specimens was reduced to almost zero above 0.3T due to thermal activation, i.e., flux creep. In the resistive Jc measurement at 4.2K these tape specimens showed Jc of ~104 A/cm2 at 18T, and 7000 A/cm2 at 23T. The Jc-H curves for some of these specimens showed a slight peak effect. The Jc’ s scarcely depended on H at 20–30T. These results indicate that the Bi-(Pb)-Sr-Ca-Cu-O tapes could be used, for example, for the innermost coil of an extremely high-field superconducting magnet at 4.2K in the near future.
Studies on Bi-(Pb)-Sr-Ca-Cu-O Superconducting Tapes
Abstract Bi-(Pb)-Sr-Ca-Cu-O superconductor was fabricated into tapes without a sheath and into multifilamentary tapes with a Ag sheath. These specimens were prepared by combination and repetition of cold pressing or cold rolling and sintering. In these specimens, the c axis tended to align well. Measurements of magnetization and critical current density, Jc, in magnetic fields up to 23T were made. The magnetization measurement revealed that, at 4.2K, these tape specimens had excellent Jc-H characteristics while, at 77K, the flux pinning force in tne tape specimens was reduced to almost zero above 0.3T due to thermal activation, i.e., flux creep. In the resistive Jc measurement at 4.2K these tape specimens showed Jc of ~104 A/cm2 at 18T, and 7000 A/cm2 at 23T. The Jc-H curves for some of these specimens showed a slight peak effect. The Jc’ s scarcely depended on H at 20–30T. These results indicate that the Bi-(Pb)-Sr-Ca-Cu-O tapes could be used, for example, for the innermost coil of an extremely high-field superconducting magnet at 4.2K in the near future.
Studies on Bi-(Pb)-Sr-Ca-Cu-O Superconducting Tapes
Sekine, Hisashi (Autor:in) / Inoue, Kiyoshi (Autor:in) / Maeda, Hiroshi (Autor:in) / Numata, Kouichi (Autor:in)
01.01.1990
10 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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