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Development of a Persistent Current Mode 9.39 T (400 MHz) LTS/Bi-2223 NMR Magnet With a Bi-2223 Superconducting Joint
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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- 28/03/2022
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