Patent ID: 6441710
Filing Date: 2002-08-27
Classification: F25B,F25D,H01F

Abstract:
A superconducting magnet apparatus comprising:a superconductor disposed in an insulating container; a refrigerator having a cold head that thermally contacts the superconductor and cools the superconductor; a magnetizing coil that applies a pulsed magnetic field to the superconductor; energization means for energizing the magnetizing coil by a pulsed current; a pulse power source that supplies the pulsed current to the magnetizing coil in order to apply the pulsed magnetic field to the superconductor; and control means for controlling the pulsed current such that a first pulsed magnetic field is applied to the superconductor element by supplying a magnetizing coil with a pulsed current whose peak value is controlled beforehand, thereby causing the superconductor element to capture a magnetic field, and at least a second pulsed magnetic field is applied to the superconductor element, thereby causing, after all of the at least second pulsed magnetic fields are applied, the superconductor element to capture an increased magnetic field in relation to the magnetic field captured after the first pulsed magnetic field is applied, wherein an intensity of successive pulsed magnetic fields applied to the superconductor element is equal to or less than that of a preceding pulsed magnetic field.