低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
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
山田 豊櫻庭 順二長谷部 次教端 文昭張 振坤石原 守渡辺 和雄
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1993 年 28 巻 9 号 p. 526-532

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We applied Bi-based superconducting bulk for current leads in a cryocooler cooled superconducting 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, 200A/cm2, respectively. At a current of 400A, this magnet can generate a steady magnetic field of 4T in a room temperature 38mm bore. Heat leakage through Bi (2223) bulk leads when passing 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.

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