Magnetic, Mechanical and Thermal Modeling of Superconducting, Whole-Body, Actively Shielded, 3 T MRI Magnets Wound Using MgB2 Strands for Liquid Cryogen Free Operation

We present magnetic, mechanical and thermal modeling results for a 3 Tesla actively shielded whole body MRI (Magnetic Resonance Imaging) magnet consisting of coils with a square cross section of their windings. The magnet design was a segmented coil type optimized to minimize conductor length while...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2022-06, Vol.32 (4), p.1-4
Main Authors: Majoros, M., Sumption, M. D., Parizh, M., Wan, F., Rindfleisch, M. A., Doll, D., Tomsic, M., Collings, E. W.
Format: Article
Language:English
Subjects:
Coils (windings)
Conduction cooling
Conductors
Critical current (superconductivity)
Design
Design optimization
Homogeneity
Magnesium compounds
Magnetic noise
Magnetic resonance imaging
Magnetic shielding
Magnets
Modelling
PARTICLE ACCELERATORS
superconducting magnet
Superconducting magnets
Thermal analysis
Thermal design
Winding
Windings
Wires
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Summary:We present magnetic, mechanical and thermal modeling results for a 3 Tesla actively shielded whole body MRI (Magnetic Resonance Imaging) magnet consisting of coils with a square cross section of their windings. The magnet design was a segmented coil type optimized to minimize conductor length while hitting the standard field quality and DSV (Diameter of Spherical Volume) specifications as well as a standard, compact size 3 T system. It had an overall magnet length and conductor length which can lead to conduction cooled designs comparable to NbTi helium bath cooled 3 T MRI magnets. The design had a magnetic field homogeneity better than 10 ppm (part-per-million) within a DSV (Diameter of Spherical Volume) of 48 cm and the total magnet winding length of 1.37 m. A new class of MgB 2 strand especially designed for MRI applications was considered as a possible candidate for winding such magnets. This work represents the first magnetic, mechanical and thermal design for a whole-body 3 T MgB 2 short (1.37 m length) MRI magnet based on the performance parameters of existing MgB 2 wire. 3 Tesla MRI magnet can operate at 20 K at 67% of its critical current.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2022.3147137