A passive shimming method for Halbach magnet based on magnetic sheet arrays

Ya Wang¹, Yajie Xu², Feng Wang³, Junhao Zhang⁴, Bowen Peng¹, Peng Yu⁵, Yingcong Yu⁶, Xiaodong Yang⁷

Affiliations

¹ School of Biomedical Engineering (Suzhou), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China; Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, Jiangsu, China.
² Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, Jiangsu, China. Electronic address: xuyj@sibet.ac.cn.
³ School of Electronic and Information Engineering, Changchun University of Science and Technology, 130022, Changchun, China.
⁴ Material Science and Engineering School, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi Province, China.
⁵ School of Biomedical Engineering (Suzhou), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China; Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, Jiangsu, China; Jinan Guoke Medical Technology Development Co., Ltd, Jinan, 250101, China.
⁶ The Third Affiliated Hospital of Shanghai University/ Wenzhou People's Hospital, Wenzhou 325000, Zhejiang Province, China. Electronic address: yuyingcong001@126.com.
⁷ Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, Jiangsu, China. Electronic address: xiaodong.yang@sibet.ac.cn.

PMID: 35447511
DOI: 10.1016/j.jmr.2022.107210

A passive shimming method for Halbach magnet based on magnetic sheet arrays

Ya Wang et al. J Magn Reson. 2022 Jun.

. 2022 Jun:339:107210.

doi: 10.1016/j.jmr.2022.107210. Epub 2022 Apr 6.

Authors

Ya Wang¹, Yajie Xu², Feng Wang³, Junhao Zhang⁴, Bowen Peng¹, Peng Yu⁵, Yingcong Yu⁶, Xiaodong Yang⁷

Affiliations

¹ School of Biomedical Engineering (Suzhou), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China; Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, Jiangsu, China.
² Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, Jiangsu, China. Electronic address: xuyj@sibet.ac.cn.
³ School of Electronic and Information Engineering, Changchun University of Science and Technology, 130022, Changchun, China.
⁴ Material Science and Engineering School, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi Province, China.
⁵ School of Biomedical Engineering (Suzhou), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China; Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, Jiangsu, China; Jinan Guoke Medical Technology Development Co., Ltd, Jinan, 250101, China.
⁶ The Third Affiliated Hospital of Shanghai University/ Wenzhou People's Hospital, Wenzhou 325000, Zhejiang Province, China. Electronic address: yuyingcong001@126.com.
⁷ Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, Jiangsu, China. Electronic address: xiaodong.yang@sibet.ac.cn.

PMID: 35447511
DOI: 10.1016/j.jmr.2022.107210

Abstract

Halbach magnet has great potential in nuclear magnetic resonance device, where the field homogeneity requirement puts heavy demands on high efficiencypassive shimming (PS) technique. Conventional PS involves a tedious iteration process of the magnetic block/sheet number and positions optimization. In this paper, we propose a PS method based on magnetic sheet arrays (MSAs) targeting at spherical harmonic basis up to the 3rd order including dedicated composition of Y(4Z2-X2-Y2), Z3 and X(4Z2-X2-Y2) (n = 3, m = -1,0,1) with cross terms to implement structural field compensation. With this approach, the homogeneity of a 0.5 T Halbach magnet was improved from the original 811 ppm to 4.7 ppm in a L15 mm × R2.5 mm water sample. Rough shimming in another 0.93 T Halbach magnet also improved the homogeneity from 1103 ppm to 125 ppm in R2.5 mm sphere. This work provides a flexible, convenient PS method based on MSAs for compact Halbach magnet, which can be applied in NMR spectrometers and other high homogeneity application circumstances.

Keywords: Halbach magnet; High efficiency; Magnetic sheet arrays; Passive shimming.

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Conflict of interest statement

Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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A passive shimming method for Halbach magnet based on magnetic sheet arrays

Affiliations

A passive shimming method for Halbach magnet based on magnetic sheet arrays

Authors

Affiliations

Abstract

Conflict of interest statement

Publication types

MeSH terms