Possibility of Quench of Superconducting Magnets in the Persistent Current Mode

In appreciation of a time relaxation behavior of critical currents as a result of flux creep in type-II superconductors, the possibility has been investigated that superconducting magnets may quench even in the persistent current mode. Because the time relaxation behavior of critical currents has been not observed directly, it has been thought as “the shadow, ” i.e., an implicit phenomenon. If a quench in the persistent current mode is experimentally confirmed, “the substance” of the time-dependent critical current will be grasped and then it appears explicitly. Experimental methods that can meet with quenches in the persistent current mode are proposed.