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We had successfully operated the 1020-MHz (24.0 T) nuclear magnetic resonance (NMR) spectrometer for 8 months, including the cooling down, shimming, and the 6-month operation for NMR measurements. The NMR superconducting magnet, which had consisted of NbTi and Nb3Sn coils, was upgraded by replacing the innermost Nb3Sn coil with a (Bi,Pb)2Sr2Ca2Cu3O10 (Bi-2223) one. The Bi-2223 innermost coil was connected...
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