Abstract
The superconducting magnets for a magnetically levitated vehicle are often designed to operate in persistent current mode. Ideally, the magnets carry DC transport current in a steady magnetic field. The magnet, however, will experience transient fields and thus induce transient transport current due to mechanical and electrical perturbations. Under these conditions, it is possible for the AC losses in the superconductor to result in a decay of the persistent transport current. This paper presents a unique method of measuring the transport current loss component of the hysteretic AC loss by measurement of the decay of the persistent current. The experimental apparatus consists of a pair of matched solenoidal coils. These coils, after being charged by an energizing coil, are subject to magnetic field variations. The current decay rate in the persistent-mode coil pair is measured as a function of the strength and frequency of the external field. This current decay rate is directly related to the loss of energy. The experimental data are presented primarily for large field variations, and these results are compared to theoretical prediction.
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