Development of a split-pair type 25T cryogen-free superconducting magnet

2015 Fiscal Year Final Research Report

• Project/Area Number: 25246032
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: General applied physics
• Research Institution: Tohoku University
• Principal Investigator: WATANABE Kazuo 東北大学, 金属材料研究所, 教授 (30143027)
• Co-Investigator(Kenkyū-buntansha): AWAJI Satoshi 東北大学, 金属材料研究所, 准教授 (10222770) ; OGURO Hidetoshi 東北大学, 金属材料研究所, 助教 (90567471)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 無冷媒超伝導マグネット / ニオブ３スズ超伝導線材 / モノリス超伝導線材 / 高温超伝導テープ / スプリット型超伝導マグネット / 高温超伝導内挿コイル

Outline of Final Research Achievements

High strengthened CuNb/Nb3Sn monolithic conductor and equivalent cross-sectional 8-strand Rutherford cable conductor have been fabricated, and the critical current properties for react&wind processed coils with coil bending strain of ε=0.42% have been evaluated at 15 K and 4 T. It is found that the critical current properties of a Rutherford cable coil are superior to those of a monolithic coil in the react&wind method.
We succeeded in developing a 25 T cryogen-free superconducting magnet composed of the world's first react&wind CuNb/Nb3Sn Rutherford cable 14.0 T cryogen-free superconducting magnet.
Concerning quench characteristic and thermal stability of a high-Tc RE123 coil, we obtained that the higher temperature operation for a high-Tc RE123 coil is the suitable condition in case of occurrence of the normal transition.

Free Research Field

超伝導工学