A theoretical investigation on current imbalance in flat two-layer superconducting cables

A model for the simulation of current distribution in superconducting Ruthe rford cables is described. The model assumes that interstrand currents can flow continuously among the strands, as if the contact resistances were sme ared along the cable length. The model is aimed at the simulation of the ge neration and development of long-range current loops in the presence of tim e-dependent magnetic fields. The results of the model are compared with tho se obtained through the lumped constant circuit model currently used to cal culate the current distribution in Rutherford cables obtaining a good quant itative agreement. The model has also been applied to the study of current distribution in the Rutherford cable of a short LHC dipole magnet. The calc ulated values of current differences among the strands are in qualitative a greement with the experimental data on the amplitude of periodic oscillatio ns of the magnetic field in the magnet bore. (C) 2001 Elsevier Science Ltd. All rights reserved.