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Low leakage, low field, easy access flat hybrid magnets for MRI applications are being investigated. This configuration associates bobbins and ferrite permanent magnets having a Br field equal to 0.4 T. The complete magnet is designed using the laboratory-conceived CALMAG3D code[1] which allows us to simulate, in three dimensions, the various magnetic field producing elements (resistive bobbins, permanent magnets, ferromagnetic pieces) while taking into account their nonlinearity. A full-scale magnet should produce a sufficiently homogeneous field of a few ppm over a 30 cm sphere for whole body imaging purposes. For this reason we have elaborated a configuration of cylindrical [2] form with a revolution symmetry. The realisation of a 1/3 prototype requires some ferrite disks of big dimensions. We propose here a relatively low cost fabrication method with respect to that proposed by the manufacturers

Design and Realization of Large Dimension Ferrite Rings