SUPERCONDUCTOR ELECTROMAGNET AND MAGNETIC RESONANCE IMAGING DEVICE

摘要

To minimize, with a simple configuration, electromagnetic force which arises from an eddy current in a radiation shield when a superconductor electromagnet is quenched, one or more conductor rings (5) are bonded to a radiation shield (4) upon approximately the same axis as a superconductor coil. A region whereupon the conductor rings (5) are bonded is a region in which the direction of a component of a magnetic field in a radial direction when the superconductor coil is quenched is the opposite of a region in which the superconductor rings are not bonded. It is thus possible to eliminate electromagnetic force arising from an eddy current in the radiation shield when the superconductor electromagnet is quenched with electromagnetic force arising in the conductor rings.