Abstract
Current redistribution in carpet-stack cables made from 2nd generation HTS tapes is investigated. In the carpet stack geometry tapes are stacked with their broad faces parallel to each other to build up a cable. Current redistribution in HTS cables is complex because the built-in insulation layer in each tape prevents effective current transfer between tapes. A method of shunting the tapes using periodically distributed superconducting bridges is investigated to improve current transfer, avoiding the need to solder the cable together. We calculate the mutual inductance between different tapes in a cable, and the effective resistance/transconductance for representative cable configurations. The effective time constants for current transfer and current redistribution are then calculated under different assumptions. We show that periodic shunting of the tapes using distributed superconducting bridges is an attractive method to achieve uniform current distribution in a HTS cable. The solution is flexible, and the performance of the system can be optimized by changing the width of shunt and/or the distance between shunts.
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