Ling Jiayin, Voccio John P, Hahn Seungyong, Kim Youngjae, Song Jungbin, Bascuñán Juan, Iwasa Yukikazu
Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139 USA.
IEEE Trans Appl Supercond. 2015 Jun;25(3). doi: 10.1109/tasc.2014.2370105. Epub 2014 Nov 13.
This paper presents construction and persistent-mode operation results of MgB coils for a 0.5-T/240-mm cold bore MRI magnet, wind-and-react with monofilament MgB wire at the MIT Francis Bitter Magnet Laboratory. The magnet, of respective inner and outer diameters of 276 and 290 mm and a total height of 460 mm, has center field of 0.5 T and current density of 11 kA/cm. To limit the continuous length of Hyper Tech supplied MgB monofilament wire to ≤300 m, the magnet was divided into eight series-connected coils, each equipped with a persistent current switch and a superconducting joint. We have manufactured three coil modules. Before being tested as an assembly, each coil was tested individually to ensure its capacity to carry 100-A superconducting current in the range of 10-15 K. The three coils were then assembled, connected in series, and operated as a 3-coil assembly in persistent mode at nearly 100 A in the range of 10-15 K. We present results that include: 1) construction details; 2) component performances; and 3) a 3-coil assembly performance.
本文介绍了麻省理工学院弗朗西斯·比特磁体实验室用于0.5 T/240 mm冷孔MRI磁体的MgB线圈的构造及持续模式运行结果，该线圈采用单丝MgB线进行绕制和反应形成。该磁体的内径和外径分别为276 mm和290 mm，总高度为460 mm，中心场强为0.5 T，电流密度为11 kA/cm。为了将Hyper Tech公司提供的MgB单丝线的连续长度限制在≤300 m，该磁体被分成八个串联线圈，每个线圈都配备了一个持续电流开关和一个超导接头。我们制造了三个线圈模块。在作为一个组件进行测试之前，每个线圈都进行了单独测试，以确保其在10 - 15 K范围内承载100 A超导电流的能力。然后将这三个线圈组装起来，串联连接，并在10 - 15 K范围内以近100 A的电流在持续模式下作为一个三线圈组件运行。我们给出的结果包括：1）构造细节；2）组件性能；3）三线圈组件性能。
