電磁加振試験に用いる希土類系高温超電導磁石の監視•保護手法の検証

摘要

We have been developing REBCO (Rare-Earth Barium Copper Oxide) magnets for the maglev. REBCO is one of the high temperature superconducting materials and is suitable for the on-board magnets of the maglev be-fabricated and its basic performance has been confirmed. As the next research target, electromagnetic vibration tests of ground coils by means of the real-scale REBCO coil is planned. Since the electromagnetic vibration tests usually takes several weeks, a monitoring and protection system is necessary for the REBCO magnet. If a normal conduction transition is undetected, the REBCO coil will burn out due to the Joule heating in the normal conducting region. A high-sensitive coil voltage detection method can be an effective measure against the burn-out.%実機大の希土類系高温超電導磁石を用いた地上コイル電磁加振試験を計画しており，安定した磁石速用を可能にするため，磁石監視•保護システムの検証を行った。本研究の高温超電導コィルは複数のパンケーキコィルから構成されており，対称位置のパンケーキコイル電圧差を監視することにより，冷却バランスが崩れる前に常電導転移を検知できると考えられる。