Spatial and Temporal Variations of a Screening Current Induced Magnetic Field in a Double-Pancake HTS Insert of an LTS/HTS NMR Magnet
Name
Ahn_Spatial-and-Temporal.pdf
Size
615.55 KB
Format
Adobe PDF
Checksum (MD5)
b2e6ca4c85becac01dde0629d318d5db
Author(s)
Ahn, Min Cheol
Yagai, Tsuyoshi
Hahn, Seung-Yong
Ando, Ryuya
Bascunan, Juan
Iwasa, Yukikazu
Date Issued
June 2009
Journal
IEEE Transactions on Applied Superconductivity : a publication of the IEEE Superconductivity Committee
Publisher
Institute of Electrical and Electronics Engineers
Citation
Min Cheol Ahn et al. “Spatial and Temporal Variations of a Screening Current Induced Magnetic Field in a Double-Pancake HTS Insert of an LTS/HTS NMR Magnet.” Applied Superconductivity, IEEE Transactions on 19.3 (2009): 2269-2272. © 2009 Institute of Electrical and Electronics Engineers
Version
Final published version
Abstract
This paper presents experimental and simulation results of a screening current induced magnetic field (SCF) in a high temperature superconductor (HTS) insert that constitutes a low-/high-temperature superconductor (LTS/HTS) NMR magnet. In this experiment, the HTS insert, a stack of 50 double-pancake coils, each wound with Bi2223 tape, was operated at 77 K. A screening current was induced in the HTS insert by three magnetic field sources: 1) a self field from the HTS insert; 2) an external field from a 5-T background magnet; and 3) combinations of 1) and 2). For each field excitation, which induced an SCF, its axial field distribution and temporal variations were measured and compared with simulation results based on the critical state model. Agreement on field profile between experiment and simulation is satisfactory but more work is needed to make the simulation useful for designing shim coils that will cancel the SCF.
MIT Department
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
Terms of Use
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.
Persistent DSpace Link
DOI of Published Version
http://dx.doi.org/10.1109/tasc.2009.2018102
