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

Abstract

The electromagnetic properties of a pancake coil in AC regime as a function of the number of turns is studied theoretically and experimentally. Specifically, the AC loss, the coil critical current and the voltage signal are discussed. The coils are made of Bi2Sr2Ca2Cu3O10/Ag (BiSCCO) tape, although the main qualitative results are also applicable to other kinds of superconducting tapes, such as coated conductors. The AC loss and the voltage signal are electrically measured using different pick up coils with the help of a transformer. One of them avoids dealing with the huge coil inductance. Besides, the critical current of the coils is experimentally determined by conventional DC measurements. Furthermore, the critical current, the AC loss and the voltage signal are simulated, showing a good agreement with the experiments. For all simulations, the field dependent critical current density inferred from DC measurements on a short tape sample is taken into account.

arXiv comment22 pages, 15 figures; contents extended (sections 3.2 and 4); one new figure (figure 5) and two figures replaced (figures 3 and 8); typos corrected; title changed

References in corpus (2)

• ac Losses in a Finite Z Stack Using an Anisotropic Homogeneous-Medium Approximation
• Current distribution and ac loss for a superconducting rectangular strip with in phase alternating current and applied field

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• Angular dependenceof the magnetisation AC loss: coated conductors, Roebel cables and double pancake coils
• AC loss calculation in coated conductor coils with a large number of turns
• Ripple field losses in DC biased superconductors: simulations and comparison with measurements
• Modelling of AC loss in coils made of thin tapes under DC bias current
• Local electromagnetic properties and hysteresis losses in Non-Uniformly wound 2G-HTS Racetrack Coils
• DC and AC Characterization of Pancake Coils Made from Roebel-Assembled Coated Conductor Cable