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

Journal Article · Mon Jan 31 00:00:00 EST 2022 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/tasc.2022.3147137· OSTI ID:1872455

Majoros, Milan  ^[1]; Sumption, Mike D.  ^[1]; Parizh, Michael  ^[2]; Wan, F. ^[3]; Rindfleisch, M. A. ^[4]; Doll, D. ^[4]; Tomsic, Mike  ^[4]; Collings, E. W. ^[1]

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1. The Ohio State Univ., Columbus, OH (United States)
2. General Electric Global Research, Niskayuna, NY (United States)
3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
4. Hyper Tech Research, Inc., Columbus, OH (United States)

Here 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 MgB₂ 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 MgB₂ short (1.37 m length) MRI magnet based on the performance parameters of existing MgB₂ wire. 3 Tesla MRI magnet can operate at 20 K at 67% of its critical current.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); National Institute of Biomedical Imaging and Bioengineering; National Institutes of Health (NIH)
• Grant/Contract Number: AC02-07CH11359; R01EB018363
• OSTI ID: 1872455
• Report Number(s): FERMILAB-PUB-22-257-TD; oai:inspirehep.net:2064668; TRN: US2306896
• Journal Information: IEEE Transactions on Applied Superconductivity, Vol. 32, Issue 4; ISSN 1051-8223
• Publisher: IEEE
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
magnetic resonance imaging
superconducting magnets
windings
magnetic shielding
magnetic noise
conductors
wires
conduction cooling