Patent ID: 10998127

Abstract:
A superconductor magnet apparatus (2) includes a superconductor bulk magnet (9), a cryostat (7) and a ferromagnetic shielding body (11). The bulk magnet has a superconductor bore (10), an axis (z) of rotational symmetry, and a maximum outer diameter ODbm in a plane perpendicular to the z axis. The superconductor bore has a minimum cross-sectional area Sbo in a plane perpendicular to the z axis. The cryostat has a room temperature bore (8), the bulk magnet is arranged within the cryostat and the room temperature bore is arranged within the superconductor bore. The shielding body has a shielding bore (12), the bulk magnet is arranged within the shielding bore and the shielding body extends beyond the bulk magnet at each axial end by at least ODbm/3. For an average cross-sectional area Sfb of the shielding body, Sfb≥2.5*Sbo, and the shielding body is arranged within the cryostat.