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Quench Analyses of the MIT 1.3-GHz LTS/HTS NMR Magnet
IEEE Transactions on Applied Superconductivity ( IF 1.7 ) Pub Date : 2019-08-01 , DOI: 10.1109/tasc.2019.2903268
So Noguchi 1 , Dongkeun Park 2 , Yoonhyuch Choi 2 , Jiho Lee 2 , Yi Li 2 , Philip C Michael 2 , Juan Bascuñán 2 , Seungyong Hahn 3 , Yukikazu Iwasa 2
Affiliation  

The MIT 1.3-GHz LTS/high-temperature superconducting (HTS) nuclear magnetic resonance (NMR) magnet is currently under development. The unique features of this magnet include a three-nested formation for an 800-MHz REBa2Cu3Ox (RE = Y, Gd) (REBCO) insert (H800) and the no-insulation (NI) winding technique for H800 coils. Because when it is driven to the normal state, an NI REBCO magnet will respond electromagnetically, thermally, and mechanically that may result in permanent magnet damage, analysis of a quenching magnet is a key aspect of HTS magnet protection. We have developed a partial element equivalent circuit method coupled to a thermal and stress finite-element method to analyze electromagnetic and mechanical responses of a nested-coil REBCO magnet each a stack of NI pancake coils. Using this method, quench simulations of the MIT 1.3-GHz LTS (L500)/HTS (H800) NMR magnet (1.3G), we have evaluated currents, strains, and torques of H800 Coils 1 to 3 and L500, and center fields of 1.3G, L500, and H800. Our analyses show H800 is vulnerable to mechanical damage.

中文翻译:

MIT 1.3-GHz LTS/HTS NMR 磁体的淬火分析

MIT 1.3-GHz LTS/高温超导 (HTS) 核磁共振 (NMR) 磁体目前正在开发中。这种磁体的独特之处包括用于 800-MHz REBa2Cu3Ox (RE = Y, Gd) (REBCO) 插入 (H800) 的三嵌套结构和用于 H800 线圈的无绝缘 (NI) 绕组技术。因为当它被驱动到正常状态时,NI REBCO 磁铁会在电磁、热和机械方面做出响应,这可能会导致永磁体损坏,因此对淬火磁铁的分析是 HTS 磁铁保护的一个关键方面。我们开发了一种与热和应力有限元方法耦合的部分元素等效电路方法,以分析嵌套线圈 REBCO 磁体的电磁和机械响应,每个磁体都是一堆 NI 薄饼线圈。使用这种方法,对 MIT 1 进行淬火模拟。3-GHz LTS (L500)/HTS (H800) NMR 磁体 (1.3G),我们评估了 H800 线圈 1 至 3 和 L500 以及 1.3G、L500 和 H800 的中心场的电流、应变和扭矩。我们的分析表明 H800 容易受到机械损坏。
更新日期:2019-08-01
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