The properties of a small pancake coil made with a 10mm wide copper-stabilized YBa2Cu3O7−x (YBCO) coated conductor were investigated. The radial component of the magnetic field was mapped at the coil edge in both the dc and ac regimes and differs significantly from that calculated assuming a uniform current distribution. The observed hysteresis indicates the strong influence of the ferromagnetic properties of the substrate. The ac losses of the coil were measured for ac frequencies between 60 and 1000Hz. The differences in properties of the YBCO coil and a similarly prepared copper coil are discussed.
Bi-2223 silver sheathed tapes are currently used in prototypes of HTS power devices, where they generally carry an electrical ac current and are exposed to an alternating magnetic field that may have different orientation with respect to the tape. In this work we describe the experimental set-up for measuring ac losses of HTS tapes due to the simultaneous presence of ac current and ac magnetic field. The experimental results have been compared and contrasted with a numerical model purposely developed for the evaluation of current distribution and ac loss in HTS tapes.
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