Design Overview of the MIT 1.3-GHz LTS/HTS NMR Magnet with a New REBCO Insert
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21ja089_full.pdf
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Author(s)
Park, Dongkeun
Bascunan, Juan
Li, Yi
Lee, Wooseung
Choi, Yoonhyuck
Iwasa, Yukikazu
Date Issued
August 2021
Journal
IEEE Transactions on Applied Superconductivity
Publisher
IEEE
Abstract
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 opera-tion 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 normal-ly rated at 11.74 T (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 de-sign constraints. We have also designed H835 to protect it from permanent damage in an improbable event like a quench. Key de-sign 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 in-cludes: 1) electromagnetic and mechanical design of H835; 2) cryo-genics overview; 3) quench protection strategy; and 3) discussion on the next steps to successfully complete 1.3G.
Description
Submitted for publication in IEEE Transactions on Applied Superconductivity
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1109/tasc.2021.3064006
