Nonlinear Behavior of a Shim Coil in an LTS/HTS NMR Magnet With an HTS Insert Comprising Double-Pancake HTS-Tape Coils
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Hahn_Nonlinear-Behavior.pdf
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Author(s)
Iwasa, Yukikazu
Bascunan, Juan
Yao, Weijun
Ahn, Min Cheol
Hahn, Seung-Yong
Date Issued
July 2009
Journal
IEEE Transactions on Applied Superconductivity
Publisher
Institute of Electrical and Electronics Engineers
Citation
Seung-yong Hahn et al. “Nonlinear Behavior of a Shim Coil in an LTS/HTS NMR Magnet With an HTS Insert Comprising Double-Pancake HTS-Tape Coils.” Applied Superconductivity, IEEE Transactions on 19.3 (2009): 2285-2288. © 2009 IEEE
Version
Final published version
Abstract
This paper reports results, experimental and analytical, of the nonlinear behavior of a shim coil in the presence of an HTS coil assembled with double-pancake (DP) HTS-tape coils. The experimental results are from: 1) operation of a 700 MHz LTS/HTS NMR magnet (LH700) consisting of a 600 MHz LTS NMR magnet (L600) equipped with superconducting shim coils and a 100 MHz DP-assembled HTS insert (H100) and; 2) an experiment with a room-temperature (RT) Z1 shim coil coupled to a 50 MHz DP-assembled HTS insert (H50). A field mapping theory with a harmonic analysis is applied to interpret both results. Based on experimental results and analyses, we conclude that the screening-current-induced field (SCF) generated by a DP-assembled HTS insert is primarily responsible for the nonlinear behavior, including strength degradation, of a shim coil.
MIT Department
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
http://dx.doi.org/10.1109/tasc.2009.2018809
