The application of the BEM-FEM coupling method for the accurate calculation of fields in superconducting magnets

The design and optimization of the superconducting dipole magnets for the L arge Hadron Collider (LHC), is dominated by the requirement of an extremely uniform field. With the application of the BEM-FEM coupling method, the fi eld problem is decomposed into the calculation of the source vector potenti al, and the reduced vector potential resulting from iron magnetization. The numerical errors do not influence the dominating contribution from the sup erconducting coil and the surrounding air region needs not to be meshed. Th is simplifies the preprocessing and avoids artificial boundary conditions a t some "far" boundaries.