Hysteresis Loss of a Superconducting Coil Mechanically being Vibrated
Sanetoshi SAITO, Eiji SUZUKI
The superconducting magnet on a maglev vehicle vibrates under the electro-magnetic disturbance from the ground coils. When the superconducting magnet vibrates, it heats and evaporates the liquid helium which cools the SC coil. In general there are two contributions to this phenomenon of heating. One is an electro-magnetic one, which induces an eddy current on the inner vessel. The other is a mechanical one. When the inner vessel and SC coil vibrate, friction and hysteresis loss occur. Especially we paid focus on the mechanical vibration and constructed a mechanically vibrating test facility to investigate the heating characteristics of a superconducting coil thus vibrated under a purely mechanical force. In this paper, we discuss about the test results and the amount of heat loss by hysteresis.