Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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A design study of a 4.7 T 85 mm low temperature superconductor magnet for a nuclear magnetic resonance spectrometer

  • Bae, Ryunjun (Department of Electrical and Computer Engineering, Seoul National University) ;
  • Lee, Jung Tae (Department of Electrical and Computer Engineering, Seoul National University) ;
  • Park, Jeonghwan (Department of Electrical and Computer Engineering, Seoul National University) ;
  • Choi, Kibum (Department of Electrical and Computer Engineering, Seoul National University) ;
  • Hahn, Seungyong (Department of Electrical and Computer Engineering, Seoul National University)
  • Received : 2021.11.19
  • Accepted : 2022.08.27
  • Published : 2022.09.30
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Abstract

One of the recent proposals with nuclear magnetic resonance (NMR) is a multi-bore NMR which consists of array of magnets which could present possibilities to quickly cope with pandemic virus by multiple inspection of virus samples. Low temperature superconductor (LTS) can be a candidate for mass production of the magnet due to its low price in fabrication as well as operation by applying the helium zero boil-off technology. However, training feature of LTS magnet still hinders the low cost operation due to multiple boil-offs during premature quenches. Thus in this paper, LTS magnet with low mechanical stress is designed targeting the "training-free" LTS magnet for mass production of magnet array for multi-bore NMR. A thorough process of an LTS magnet design is conducted, including the analyses as the followings: electromagnetics, mechanical stress, cryogenics, stability, and protection. The magnet specification was set to 4.7 T in a winding bore of 85 mm, corresponding to the MR frequency of 200 MHz. The stress level is tolerable with respect to the wire yield strength and epoxy crack where mechanical disturbance is less than the minimum quench energy.

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Acknowledgement

This work was supported by National R&D Program through the National Research Foundation of Korea(NRF) funded by Ministry of Science and ICT(2022M3I9A1072846). This work was also supported in part by the Korea Medical Device Development Fund grant funded by the Korea government (the Ministry of Science and ICT, the Ministry of Trade, Industry and Energy, the Ministry of Health & Welfare, the Ministry of Food and Drug Safety) (1711138068, Project Number: KMDF_PR_20200901_0063).

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