Abstract
A method is developed for designing a special iron shielded superconducting magnet forMRI in this paper. The shield is designed as an integral part of the cryostat and highpermeability and high saturated magnetization iron material is adopted. This scheme willresult in a compact iron shielded magnet. In the presented design, the finite element (FE)method is adopted to calculate the magnetic field produced by superconducting coils andnonlinear iron material. The FE method is incorporated into the simulated annealingmethod which is employed for corresponding optimization. Therefore, geometricalconfigurations of both coils and iron shield can be optimized together. This method candeal with discrete design variables which are defined to describe the cable arrangements ofcoil cross sections. A detailed algorithm of the present design is described and anexample for designing a 1.5 T clinical iron shielded magnet for MRI is shown.
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