The influence of geometry on self-field AC losses of Ag sheathed PbBi2223 tapes

Yang, Y., Hughes, T., Beduz, C., Spiller, D.M., Scurlock, R.G. and Norris, W.T. (1996) The influence of geometry on self-field AC losses of Ag sheathed PbBi2223 tapes. Physica C: Superconductivity and its Applications, 256 (3-4), 378-386. (doi:10.1016/0921-4534(95)00662-1).

Abstract

We measured axial fields along an Ag sheltered PbBi2223 superconducting tape 3 mm wide and 0.03 mm thick carrying 47 Hz alternating currents. The critical current of the tape at 77 K was 15 A corresponding to a critical current density of 16000 A/cm². The axial electric field was measured by pairs of voltage leads brought out in a plane perpendicular to the tape axis, turned axially to meet and so led out to a voltmeter. The spatial variation and the current dependence of the electric field, obtained from several pairs of taps closed at different radial positions, were consistent with the prediction for a uniform superconducting thin rectangle with a critical current I_c rather than a superconductor of elliptical cross-section. Our results also showed that the hysteretic losses at currents below I_c can be measured with an accuracy of about 5% using a pair of taps closed at a radial distance about three times the tape half-width.

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