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The electromagnetic properties of a pancake coil in AC regime as a functionof the number of turns is studied theoretically and experimentally.Specifically, the AC loss, the coil critical current and the voltage signal arediscussed. The coils are made of Bi2Sr2Ca2Cu3O10/Ag (BiSCCO) tape, although themain qualitative results are also applicable to other kinds of superconductingtapes, such as coated conductors. The AC loss and the voltage signal areelectrically measured using different pick up coils with the help of atransformer. One of them avoids dealing with the huge coil inductance. Besides,the critical current of the coils is experimentally determined by conventionalDC measurements. Furthermore, the critical current, the AC loss and the voltagesignal are simulated, showing a good agreement with the experiments. For allsimulations, the field dependent critical current density inferred from DCmeasurements on a short tape sample is taken into account.

Theoretical and experimental study of AC loss in HTS single pancake coils