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説明:

We developed and operated a persistent current (PC) mode 9.39 T (400 MHz for 1H NMR) LTS/Bi-2223 NMR magnet using a Bi-2223 insert coil with a superconducting joint. Firstly, we developed a basic joining procedure to achieve the superconducting joint for the high-strength Bi-2223 tape used for the insert coil. We applied this procedure to the coil. Secondly, a stand-alone PC mode operation test for the coil at 4.2 K was performed. No apparent field decay was observed owing to the superconducting joint. Finally, we installed the coil inside the LTS outer coil’s bore to form a PC mode LTS/Bi-2223 NMR magnet system. We successfully demonstrated a ~ 9.39 T PC mode operation on the magnet over 1500 h though the current of the insert coil was limited to 5 A. The field drift rate was as low as ~ 0.3 × 10^−3 ppm/h. The joint resistance was estimated to be ~ 3 × 10^−13 Ω at 4.2 K, 0.26 T. To our best knowledge, this is the first demonstration of superconducting joint that realized a PC mode LTS/Bi-2223 NMR magnet.

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キーワード: Persistent current

刊行年月日: 2022-03-28

出版者: Institute of Electrical and Electronics Engineers (IEEE)

掲載誌:

• IEEE Transactions on Applied Superconductivity (ISSN: 10518223) vol. 32 issue. 6 p. 1-5 4301005

研究助成金:

• JST-Mirai Program JPMJMI17A2
• Special Postdoctoral Researcher Program at RIKEN

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4470

公開URL: https://doi.org/10.1109/tasc.2022.3162795

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更新時刻: 2024-04-06 08:30:15 +0900

MDRでの公開時刻: 2024-04-06 08:30:15 +0900