Field gradient calculation of HTS double-pancake coils considering the slanted turns and the splice

IF 0.2 Q4 PHYSICS, APPLIED Progress in Superconductivity and Cryogenics Pub Date : 2017-03-31 DOI:10.9714/PSAC.2017.19.1.051

Geonwoo Baek, Jinsub Kim, W. Lee, Seunghyun Song, Onyou Lee, Hyoungku Kang, T. Ko

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引用次数: 1

Abstract

2017) Abstract To obtain Nuclear Magnetic Resonance (NMR) measurement of membrane protein, an NMR magnet is required to generate high intensity, homogeneity, and stability of field. A High-Temperature Superconducting (HTS) magnet is a promising alternative to a conventional Low-Temperature Superconducting (LTS) NMR magnet for high field, current density, and stability margin. Conventionally, an HTS coil has been wound by several winding techniques such as Single-Pancake (SP), Double-Pancake (DP), and layer-wound. The DP winding technique has been frequently used for a large magnet because long HTS wire is generally difficult to manufacture, and maintenance of magnet is convenient. However, magnetic field generated by the slanted turns and the splice leads to field inhomogeneity in Diameter of Spherical Volume (DSV). The field inhomogeneity degrades performance of NMR spectrometer and thus effect of the slanted turns and the splice should be analyzed. In this paper, field gradient of HTS double-pancake coils considering the slanted turns and the splice was calculated using Biot-Savart law and numerical integration. The calculation results showed that magnetic field produced by the slanted turns and the splice caused significant inhomogeneity of

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考虑倾斜匝数和拼接的高温超导双扁线圈的场梯度计算

摘要为了获得膜蛋白的核磁共振(NMR)测量，需要核磁共振磁体产生高强度、均匀性和稳定性的磁场。高温超导(HTS)磁体是传统低温超导(LTS)核磁共振磁体的一个有前途的替代品，具有高磁场、高电流密度和高稳定裕度。传统上，高温超导线圈有几种绕制技术，如单煎饼(SP)、双煎饼(DP)和分层绕制。由于高温超导长导线制造难度大，且磁体维护方便，因此在大型磁体中经常采用高温超导绕线技术。然而，斜匝和剪接产生的磁场导致球面体积(DSV)直径的磁场不均匀性。磁场的不均匀性降低了核磁共振谱仪的性能，因此需要分析斜匝和剪接的影响。本文利用Biot-Savart定律和数值积分法计算了考虑斜匝和拼接的高温超导双煎饼线圈的场梯度。计算结果表明，斜匝和剪接所产生的磁场引起了明显的不均匀性

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来源期刊

Progress in Superconductivity and Cryogenics PHYSICS, APPLIED-

CiteScore

0.40

自引率

33.30%

发文量

期刊介绍： Progress in Superconductivity and Cryogenics is the official publication of The Korea Institute of Applied Superconductivity and Cryogenics and the Korean Superconductivity Society. It was launched in 1999, and accepts original research articles and review papers on research on superconductivity and related fields of physics, electronic devices, materials science, large-scale applications for magnets, power and energy, and cryogenics. The Journal is published quarterly in March, June, September, and December each year. Supplemental issues are published occasionally. The official title of the journal is ''Progress in Superconductivity and Cryogenics'' and the abbreviated title is ''Prog. Supercond. Cryog.'' All submitted manuscripts are peer-reviewed by two reviewers. The text must be written in English. All the articles in this journal are KCI and SCOPUS as of 2015. The URL address of the journal is http://psac.kisac.org where full text is available. This work was supported by the Korean Federation of Science and Technology Societies grant funded by the Korea government.