Very high currents can be induced in pairs of current-carrying superconducting rings when they are coaxially brought closer. If the currents are uniformly distributed through the cross-section of the rings their magnitude can be derived from the mutual inductance of interacting rings. However, if the currents are not uniformly distributed that calculation procedure should be no longer applicable. The aim of this paper is to report on an alternative procedure to determine the induced currents by measuring the magnetic flux density around the rings and applying the Ampre’s circuital law. Our results show that in axially confronted rings the induced currents may be significantly larger than the critical current of an isolated ring, which may be explained in terms of a reduction of the magnetic self-field.

当它们同轴地靠近时，会在成对的载流超导环中感应出很高的电流。如果电流通过环的横截面均匀分布，则其大小可以从相互作用的环的互感得出。但是，如果电流分布不均匀，则该计算程序将不再适用。本文的目的是报告通过测量环周围的磁通密度并应用Ampre的电路定律来确定感应电流的替代方法。我们的结果表明，在轴向面对的环中，感应电流可能比隔离环的临界电流大得多，这可以用减少磁场自磁场来解释。