Periodicity of Contacts Between Subcables in the Multistage Cable-in-Conduit Conductors and Its Effect on Computation of AC Losses and Supercoupling Currents

The paper refines the lumped network technique for computation the coupling AC losses and magnetically induced supercoupling currents in multistage cable-in-conduit conductors (CICC) used in superconducting magnetic energy storages, tokamak reactors, etc. Surfaces of the subcables in CICC are not ldquosmoothrdquo, but ldquocorrugatedrdquo. As a result, the contacts between the subcables are featured with a certain periodicity, which depends on the pitches of the sequential cabling stages. The paper presents the expression for such a periodicity and the results of computation of AC loss and supercoupling currents with and without taking into account the envisaged periodicity of the contacts between subcables in multistage CICC, showing the significance of the effect.