Journal
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Volume 31, Issue 5, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2021.3064006
Keywords
High-Field Magnets; HTS Magnets; No-Insulation Winding Technique; Nuclear Magnetic Resonance; REBCO tape
Funding
- National Institute of General Medical Sciences of the National Institutes of Health [R01GM137138]
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The design overview introduces the MIT 1.3-GHz LTS/HTS NMR magnet (1.3G) and the newly designed 835-MHz REBCO insert (H835) as a replacement for the damaged 800-MHz REBCO insert (H800). H835 is designed to operate stably and be protected in case of unlikely events like a quench.
We present a design overview of the MIT 1.3-GHz LTS/HTS NMR magnet (1.3G) with a newly designed 835-MHz REBCO insert (H835) as a replacement for the 800-MHz REBCO insert (H800) that was damaged when it quenched during operation in 2018. The new H835 is designed to contribute 19.6 T in a background field of 10.93 T by an LTS NMR magnet that normally rated at 11.74T(500 MHz): combined, 1.3G generates a total field of 30.53 T corresponding to a proton resonance frequency of 1.3 GHz. H835 is designed to operate stably while meeting 1.3G design constraints. We have also designed H835 to protect it from permanent damage in an improbable event like a quench. Key design features are: 1) a single-coil formation, composed of 38 stacked metal-co-wound no-insulation and 2 stacked no-insulation double-pancake coils, all with mechanically improved cross-over sections; 2) enhanced thermal stability; and 3) reduced current margin with a detect-and-heat method. This paper includes: 1) electromagnetic and mechanical design of H835; 2) cryogenics overview; 3) quench protection strategy; and 3) discussion on the next steps to successfully complete 1.3G.
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