Design Overview of the MIT 1.3-GHz LTS/HTS NMR Magnet with a New REBCO Insert
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21ja111_full.pdf
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Author(s)
Park, Dongkeun
Bascuñán, Juan
Li, Yi
Lee, Wooseung
Choi, Yoonhyuck
Iwasa, Yukikazu
Date Issued
November 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 of the 800-MHz REBCO insert that was damaged when it quenched during operation in 2018. The new H835 contributes 19.6 T as designed, with an LTS back-ground magnet of 10.9 T, toward a total field of 30.5 T that corre-sponds to a proton resonance frequency of 1.3 GHz. The H835 is de-signed to be stable within 1.3G design constraints. The design also prevents the entire insert from permanent damage in the improba-ble event like a quench. Key design features are: 1) a single-solenoid structure, composed of 38 stacked metal-co-wound no-insula-tion and 4 stacked no-insulation double-pancake coils with mechan-ically improved cross-over sections; 2) enhanced thermal stability; and 3) reduced excessive current margin with a detect-and-activate-the-heater method. This paper includes: 1) electromagnetic and me-chanical design of the H835; 2) cryogenics overview; 3) quench pro-tection schemes; and 3) discussion on the next steps toward the 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
