HTS内層コイルを使用した永久電流NMRの開発（３）〜REBCO線材の超電導接合体の永久電流評価とIc-B特性〜
(Development of a persistent NMR using HTS inner coils (3) - Evaluations of persistent coil field decay and Ic-B characteristics on a REBCO superconducting joint-)