MIT 1.3-GHz LTS/HTS NMR Magnet: Post Quench Analysis and New 800-MHz Insert Design
MIT 1.3-GHz LTS/HTS NMR Magnet: Post Quench Analysis and New 800-MHz Insert Design
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DOI：
10.1109/tasc.2019.2901026
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发表时间：
2019-08-01
影响因子：
1.8
通讯作者：
Iwasa, Yukikazu
中科院分区：
文献类型：
--
作者：
Park, Dongkeun;Bascunan, Juan;Iwasa, Yukikazu
我们介绍了MIT 800MHz REBCO插入磁体（H800）的淬火后分析，该磁体在2018年3月的运行期间意外淬火，并对新的800-MHz HTS插入磁体（H800N）进行了设计研究。绕线的H800应该贡献18.7 T，与LTS背景磁铁（L500）一起，产生30.5 T，对应于1.3 GHz的质子共振频率。H800在液氦中以4.2 K的温度工作，在电源达到251.3 a的目标工作电流后约5分钟，它经历了一次淬火。由于H800的损坏比最初出现的更广泛，我们决定设计和制造一种新的插入磁铁，H800N。在设计H800N时，我们试图消除H800设计中意想不到的缺陷。H800N具有以下特点：1)采用由40个叠置双煎饼线圈组成的单螺线管结构，改进了交叉截面；2)增强热稳定性；3)减小失稳保护的电流余量。
We present post-quench analyses of the MIT 800MHz REBCO insert magnet (H800), unexpectedly quenched during operation in March 2018, and design study of a new 800-MHz HTS insert (H800N). The as-wound H800 was supposed to contribute 18.7 T and, with an LTS background magnet (L500), produce 30.5 T corresponding to a proton resonance frequency of 1.3 GHz. The H800 was operated at 4.2 K in liquid helium and, about 5 min after the power supply reached a target operating current of 251.3 A, it experienced a quench. Because the damage in the H800 was more widespread than it first appeared, we decided to design and build a new insert magnet, H800N. In designing H800N, we tried to eliminate unanticipated flaws in our H800 design. H800N has been designed to be more stable and reliable against quench without permanent damage by: 1) adopting a single solenoid structure composed of 40 stacked double pancake coils with improved cross-over sections; 2) enhancing thermal stability; and 3) reducing excessive current margin for quench protection.