Eddy currents in flat metal-filled superconducting braids

Abstract

Flat braids partially soldered together with a soft nonsuperconducting alloy have superior electrical stability and mechanical properties as compared to braids made from fully insulated superconducting wires. Eddy currents induced by a changing field, however, may cause undesirable field shape changes and power loss in magnets. An analysis of these eddy currents for the case of constant rate of change of field is presented, and comparisons made with observed field distortions or power loss in two magnets.