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Cryocooler Cooled Superconducting Magnet. Application of Bi-Based Oxide Superconducting Current Leads for the Magnet
冷凍機冷却型超電導マグネットの開発 Bi系超電導バルク電流リードの適用

Yutaka YAMADA, Junji SAKURABA, Tsuginori HASEBE, Fumiaki HATA, Chin Kung CHONG, Mamoru ISHIHARA, Kazuo WATANABE
1993 TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)  

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We applied Bi-based superconducting bulk for current leads in a cryocooler cooled supercon ducting magnet using no liquid helium: The bulk has a composition of (Bi+Pb):Sr:Ca:Cu= 2:2:2:3 and is utilized in the form of thin-walled sintered cylindrical tube. Critical current and critical current density of the bulk under self magnetic field at 77K are at 1 ,100A and 1,200 A/cm2, respectively. At a current of 400A, this magnet can generate a steady magnetic field of 4T in a room temperature 38mm
more » ... e. Heat leakage through Bi (2223) bulk leads when pass ing a current of 400A is slight at about 0.2W. Thereby, the resulting total heat load on the coil is less than 0.4W, within cooling capacity of the G-M cryocooler.
doi:10.2221/jcsj.28.526 fatcat:wb5luybbazh7xocpucwuis74lm
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Yutaka YAMADA, Junji SAKURABA, Tsuginori HASEBE, Fumiaki HATA, Chin Kung CHONG, Mamoru ISHIHARA, Kazuo WATANABE. "Cryocooler Cooled Superconducting Magnet. Application of Bi-Based Oxide Superconducting Current Leads for the Magnet." TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 28.9 (1993) 526-532