| 摘要 |
<p>A coil unit is formed of an oxide superconducting wire having a surface in a form of a strip and wound. A residual magnetic field restraint unit is disposed in the coil unit. The residual magnetic field restraint unit has a throughhole extending in an axial direction of the coil unit. The residual magnetic field restraint unit is formed of a magnetic substance. A residual magnetic field can thus be restrained.</p> |
