3D FEM analysis of inter-strand coupling losses in Rutherford cables with composite core

Improved Rutherford cables have recently been proposed for magnets for expe riments of high energy physics. They have either a sheet of stainless steel or a composite metal sheet as a core put in the usual Rutherford cable. Th e cable with this composite core sheet in it is a candidate for a new cable with both low losses and high stability. In order to estimate the interstr and coupling losses produced in this cable, three dimensional finite elemen t method (3D FEM) analysis is carried out. The results obtained show that t he existence of 3D shielding current in it determines the profile of toss p roperties under changing magnetic fields of face-on orientation, The effect of spatial period of the core structure along the cable axis on the loss i s also elucidated, This will be a useful aid for the design of the cable.