Mechanical Vibration Test of a REBCO Coil Designed for Application to the Maglev

We have been developing on-board REBCO magnets for maglev. Because of the running vibration, the on-board magnets receive vibration acceleration up to 10 G (98 m/s2). For the realization of the on-board REBCO magnet, we carried out mechanical vibration tests with a real-scale REBCO coil. The REBCO coil is racetrack-shaped (1070 mm wide, 500 mm high), and its magnetomotive force is 700 kA. The upper limit temperature of the excitation is approximately 39 K. The REBCO coil was excited and vibrated for 20 min for the evaluation of durability and heat load. Any mechanical damage on the REBCO coil was not observed, although the vibration acceleration in the experiments exceeded 10 G. The heat load was small enough compared to the static heat load.