Abstract
We have successfully upgraded the a 920-MHz (21.6 T) nuclear magnetic resonance (NMR) superconducting magnet to 1020 MHz (24.0 T). The newly developed 3.6-T (Bi,Pb)2Sr2Ca2Cu3O10 (Bi-2223) innermost coil, which was made of Cu-alloy laminated Bi-2223 tapes, was installed instead of a Nb3Sn innermost coil. The upgrading project was a technical challenge for a Bi-2223 high-Tc superconductor, not only from a high-field application point of view, but also from the perspective of homogeneous and stable field generation. In this review, the development of the a Bi-2223 innermost coil and the outline for upgrading are introduced. Serious damage caused by the Great East Japan Earthquake is also introduced. Some major accomplishments are shown.
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