SUPERCONDUCTING MAGNETIC SHIELD

PURPOSE:To provide a superconducting magnetic shield in which a plurality of cylindrical superconductors are combined to give a comparatively large-sized, shielded space and the flux leakage through the gaps between the superpositions is effectively reduced. CONSTITUTION:A plurality of cylindrical superconductors 1 having different diameters are coaxially superposed in order and ferromagnetic material rings 4 are arranged just outside of the gaps between the superpositions along the gaps. Among the cylinders, there are cylinders of any cases where both ends of the end parts 2 of one cylinder are closed, one end of both ends of the end parts 2 of one cylinder is closed or both ends of the end parts 2 of one cylinder are opened.