Seven-Year Operation of 25 T Cryogen-Free Superconducting Magnet as a User Magnet at HFLSM, IMR, Tohoku University

被引：3
作者：
Takahashi, K. [1 ]
Okada, T. [1 ]
Tsuchiya, Y. [1 ]
Awaji, S. [1 ]
Takewa, H. [2 ]
Hanai, S. [2 ]
Ioka, S. [2 ]
机构：
[1] Tohoku Univ, Inst Mat Res, High Field Lab Superconducting Mat, Sendai, 9808577, Japan
[2] Toshiba Energy Syst & Solut Corp, Yokohama 2300045, Japan
来源：
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2024年 / 34卷 / 05期
关键词：
Bi2223; coil; cryogen-free superconducting magnet; high magnetic field; quench;
D O I：
10.1109/TASC.2024.3350566
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A 25 T cryogen-free superconducting magnet (25 T-CSM) was installed at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University in 2015. The 25T-CSM consists of low-temperature superconducting (LTS) outsert coils and a high-temperature superconducting (HTS) coil; high strength CuNb/Nb3Sn and NbTi Rutherford cables, and Bi2Sr2Ca2Cu3Oy (Bi2223) tape were adopted for the LTS and HTS coil, respectively. The Bi2223 coil was a stack of impregnated double pancake (DP) coils. The first Bi2223 coil generated 10.6 T in a background field of 14.0 T by the LTS coils in 2015. Because of the coil stiffness insufficiency, it had an electrical instability. The new Bi2223 coil, made by improving the stiffness of DPs, successfully generated 11.1 T (25.1 T in total) in 2020. Both Bi2223 coils experienced accidental quenches during the operations as a user magnet. However, the magnet's quench detection and protection system protected the coils from the damage including the LTS coils. The 25T-CSM has been operated as a multipurpose user magnet for more than 1100 days in seven years, meaning that almost 100% of the available days were utilized for user experiments.
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页码：1 / 5
页数：5
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