| 摘要 |
PURPOSE:To make a device being compact, light-weighing, low leakage magnetic field and an environment-resistant magnetic substance while being excellent in cost performance and able to be easily carried and installed in an existing hospital constitution by making the second magnetic field to oppose the first magnetic field outside a magnet and making a yoke magnetic shield absorb a leakage portion of the first and second magnetic fields, or the like. CONSTITUTION:In a magnetic device provided with a yoke magnetic shield forming the third magnetic field on the periphery of a superconductive magnet 6 consisting of the first superelectric field coil assembly 26 generating the first magnetic field and the second superconductive coil 27 generating the second magnetic field while being electrically connected in series to the coil assembly 26, the first and second superconductive coil assemblies 26, 27 and a yoke magnetic shield 19 generate or form magnetic fields, which almost become zero when the corresponding magnetic field components of a high order are composed, and the first and second superconductive coil assemblies 26, 27 and the yoke magnetic shield 19 give a uniform composed magnetic field inside a working space 18 in the center of the magnetic device 18 so that the second magnetic field may oppose the first magnetic field outside the magnetic device and the yoke magnet shield 19 may absorb the leakage portion of the first and second magnetic fields. |
