A Shimming Scheme for Active Shielding

A careful selection of a basis for the field representation is a useful tool in the design of active shielding systems for magnetic fields. When the domains of interest are characterized by simple geometry in orthogonal coordinate systems, and linear homogeneous materials are involved, the product solution in eigenfunction series is very effective because of the availability of analytical solutions and to the convergence properties of the series. Taking advantage of analytical expressions of single eigenfunction series terms, this paper shows how to design in advance suitable elementary source, well suited to perform the shielding of fields in a direct and prompt way.