一种用于从高场低温超导/高温超导核磁共振磁体的双饼式高温超导插入件制造不确定性中阐明场杂质的分析技术。
An Analytical Technique to Elucidate Field Impurities From Manufacturing Uncertainties of an Double Pancake Type HTS Insert for High Field LTS/HTS NMR Magnets.
作者信息
Hahn Seung-Yong, Ahn Min Cheol, Bobrov Emanuel Saul, Bascuñán Juan, Iwasa Yukikazu
机构信息
Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139 USA.
出版信息
IEEE Trans Appl Supercond. 2009 Jun;19(3):2281-2284. doi: 10.1109/TASC.2009.2018808.
This paper addresses adverse effects of dimensional uncertainties of an HTS insert assembled with double-pancake coils on spatial field homogeneity. Each DP coil was wound with Bi2223 tapes having dimensional tolerances larger than one order of magnitude of those accepted for LTS wires used in conventional NMR magnets. The paper presents: 1) dimensional variations measured in two LTS/HTS NMR magnets, 350 MHz (LH350) and 700 MHz (LH700), both built and operated at the Francis Bitter Magnet Laboratory; and 2) an analytical technique and its application to elucidate the field impurities measured with the two LTS/HTS magnets. Field impurities computed with the analytical model and those measured with the two LTS/HTS magnets agree quite well, demonstrating that this analytical technique is applicable to design a DP-assembled HTS insert with an improved field homogeneity for a high-field LTS/HTS NMR magnet.
本文探讨了由双饼式线圈组装而成的高温超导插入件的尺寸不确定性对空间场均匀性的不利影响。每个双饼式线圈均采用Bi2223带材绕制而成，其尺寸公差比传统核磁共振磁体中使用的低温超导导线所允许的尺寸公差大一个数量级以上。本文介绍了：1）在弗朗西斯·比特磁体实验室制造并运行的两台低温超导/高温超导核磁共振磁体，即350兆赫兹（LH350）和700兆赫兹（LH700）中测量到的尺寸变化；2）一种分析技术及其应用，以阐明在这两台低温超导/高温超导磁体中测量到的场杂质。通过分析模型计算得到的场杂质与在这两台低温超导/高温超导磁体中测量到的场杂质相当吻合，这表明该分析技术适用于设计一种用于高场低温超导/高温超导核磁共振磁体的、具有改进场均匀性的双饼式组装高温超导插入件。
Zotero 插件