Magnet coupling and self-field AC losses of two neighbouring Ag sheathed PbBi2223 tapes

Hughes, T.J., Yang, Y., Beduz, C. and Power, A. (1998) Magnet coupling and self-field AC losses of two neighbouring Ag sheathed PbBi2223 tapes. Physica C: Superconductivity and its Applications, 310 (1-4), 187-191. (doi:10.1016/S0921-4534(98)00459-6).

Abstract

The magnetic interaction between two neighbouring superconducting tapes has significant influences on their self-field AC losses. While the two tapes are independent of each other when separated far apart, they are expected to be fully coupled and behave as a single tape when placed very near. One of the consequences of such coupling is the increase in the self-field loss per tape, which is double of that for an uncoupled tape carrying the same current. In order to assess the interactions among tapes in systems such as a power cable, a better understanding is necessary on the critical distance where the coupling becomes important. Experimental measurements on the self-field losses in two neighbouring Ag sheathed PbBi2223 tapes were carried out with the two tapes separated by various distances, while placed either side by side (side-configuration) or one on top of the other (top-configuration). The results indicates that the critical coupling distance for the top-configuration is about 5 mm, where the increase in loss per tape is about 10%. The critical length for the side-configuration is found to be of the same order of magnitude.

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