Compact superconducting magnet design for nuclear magnetic resonance: The minimum stored energy approach

Tieng, Quang M. and Vegh, Viktor (2012). Compact superconducting magnet design for nuclear magnetic resonance: The minimum stored energy approach. In Graham A. Webb (Ed.), Annual reports on NMR spectroscopy (pp. 161-189) Maryland Heights, MO, U.S.A.: Academic Press. doi:10.1016/B978-0-12-397018-3.00004-1

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Author Tieng, Quang M.
Vegh, Viktor
Title of chapter Compact superconducting magnet design for nuclear magnetic resonance: The minimum stored energy approach
Title of book Annual reports on NMR spectroscopy
Place of Publication Maryland Heights, MO, U.S.A.
Publisher Academic Press
Publication Year 2012
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1016/B978-0-12-397018-3.00004-1
ISBN 9780123970183
ISSN 0066-4103
Editor Graham A. Webb
Volume number 75
Chapter number 4
Start page 161
End page 189
Total pages 28
Total chapters 4
Collection year 2013
Language eng
Formatted Abstract/Summary
Superconducting magnet coil arrangements applicable in nuclear magnetic resonance across a range of magnetic field strengths are described in the context of the minimum stored energy (MSE) design. The approach is based on first calculating an optimal current density map, which is then used to allocate coils for the second stage of the optimization process. Having stated the coil domain, required magnetic field strength and constraint of current density, a set of superconducting magnet coil arrangements can be computed. Low- and high-field magnet coils achieving field strengths of 1, 3, 7 and 11.75 T are provided for the cylindrical compact designs, 1 T for the asymmetric coil arrangement and 1 T for the open double-doughnut configuration magnet. Irrespective of the magnet type, our findings show that individual magnet coils should be arranged at the local positive maxima and negative minima of the current density map and around the perimeter of the domain used to specify possible coil locations. Moreover, at high-field, which we assume to be larger than 3 T, the maximum fields are located on coils with the smallest radii, whereas at low-field, this is not the case. This becomes a critical observation for high-field applications, as the superconducting magnet design freedom is restricted by inherent peak field limits on superconductors. To reduce the peak field experienced by any coil, the domain has to be made longer, resulting in physically large magnets. Our findings also suggest that at low-field, reverse current coils can be employed to shorten the length of the magnet. When the field strengths is greater than 3 T, large peak fields produced between adjacent coils with alternating currents limit the ability to incorporate reverse current coils without a breach of the peak field limit.
Keyword Nuclear magnetic resonance
Superconducting magnet
Minimum stored energy
Magnetic resonance imaging
Q-Index Code B1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Book Chapter
Collections: Official 2013 Collection
Centre for Advanced Imaging Publications
 
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Created: Tue, 21 Feb 2012, 11:04:59 EST by Sandrine Ducrot on behalf of Centre for Advanced Imaging