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Flexible measures in magnetic Active Shielding

The reduction in protected regions of low frequency magnetic fields is a complex problem when the sources are not known. The paper proposes a procedure able to choose the best currents able to mitigate the disturbance field. The magnetic field is represented by suitable series of eigenfunctions in the domain of interest. The procedure includes a field identification step starting from a set of measurements and a current design step, possibly based on a preliminary design of specialized shimming coils sets.