Improvement of a Large Bore Cryogen-Free Superconducting Magnet for a Hybrid Magnet
Improvement of a Large Bore Cryogen-Free Superconducting Magnet for a Hybrid Magnet
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DOI：
10.1109/tasc.2016.2524442
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发表时间：
2016-02
影响因子：
1.8
通讯作者：
T. Tsurudome;Y. Mikami;A. Hashimoto;H. Mitsubori;H. Ookubo;J. Sakuraba;T. Kato;K. Watazawa;K. Watanabe;S. Awaji;H. Oguro;S. Hanai;S. Ioka
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文献类型：
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作者：
T. Tsurudome;Y. Mikami;A. Hashimoto;H. Mitsubori;H. Ookubo;J. Sakuraba;T. Kato;K. Watazawa;K. Watanabe;S. Awaji;H. Oguro;S. Hanai;S. Ioka
由Nb_3Sn和NbTi线圈组成的360毫米口径室温无制冷剂超导磁体（CSM），用于混合磁体（HM），产生了9.5T的最大磁场。然而，由于冷却问题，CSM的磁场在混合磁体模式下被限制在8.5 T。结果，由19 T水冷电阻磁体（WM）组成的混合磁体具有27.5 T的最大场生成。因此，我们改进了CSM以产生更高的磁场。为了改善制冷问题，更换了Nb 3Sn线圈，并改善了线圈与4K-GM制冷机之间的热传导。此外，采用抗拉强度超过80 kN的支撑结构和弹簧支撑来抵抗磁力，以支撑线圈的自重并吸收每个线圈之间的热收缩差异所引起的应力。改进后的CSM在1h内产生9.5T的磁场，在360 mm的室温孔内产生9.7T的最大磁场。HM成功地在32 mm室温孔中产生了28 T，CSM在9.0 T下运行。
A 360-mm room-temperature bore cryogen-free superconducting magnet (CSM), consisting of Nb3Sn coils and NbTi coils, for a hybrid magnet (HM) has generated the maximum magnetic field of 9.5 T. However, the magnetic field of the CSM has been limited to 8.5 T in the hybrid magnet mode because of a cooling problem. As a result, the hybrid magnet composed of a 19-T water-cooled resistive magnet (WM) had the utmost field generation of 27.5 T. Therefore, we improved the CSM to generate higher magnetic fields. For the improvement of the cooling problem, Nb3Sn coils were replaced, and thermal conduction was improved between coils and a 4K-GM cryocooler. Furthermore, support structures with a tensile strength over 80 kN and a spring support were adopted against the magnetic force to support the self-weight of coils and to absorb stress caused by thermal contraction difference between each coil. After the improvement, the CSM generated 9.5 T within 1 h and the maximum magnetic field of 9.7 T in a 360-mm room-temperature bore. The HM succeeded in generating 28 T in a 32-mm room-temperature bore with the CSM operated at 9.0 T.