Abstract: A permanent current switch apparatus according to an embodiment is a permanent current switch apparatus electrically connected to a superconducting coil via a superconducting wire, the permanent current switch apparatus including a plurality of parallel structures with thermal permanent current switches connected in parallel, the thermal permanent current switches being capable of switching between conducting and interrupting an electric current flowing through the superconducting wire. The parallel structures are connected in series.

Abstract: The conservator is provided with a housing that houses an insulation oil, a rubber bag that inflates or deflates inside the housing so as to contact an oil surface of the insulation oil, and an oil level gauge that detects the oil level of the insulation oil housed inside the housing. The oil level gauge includes a float member, an arm connected to one end of the float member, and a dial display unit that displays an oil level in response to an angle of the arm. The float member is swingably connected to the arm, extending away from the arm along the lower surface of the rubber bag. The length of the float member in the extending direction thereof is larger than the maximum thickness of the float member.

Abstract: A superconductive magnet device includes a superconductive magnet body and non-magnetic pipes made of a transparent non-magnetic material. Preferably, the magnetic shims for compensating for the inhomogeneous magnetic field components generated by the superconductive magnet body are colored in accordance with the kinds thereof. Thus, during the adjustment operation of the inhomogeneous magnetic field, the number, kinds, and the position of the magnetic shims within the non-magnetic pipes can be ascertained from without.

Abstract: A magnetic field correction device for enhancing the homogeneity of a magnetic field generated by a magnet of a magnetic resonance imaging device. The correction device includes a plurality of magnetic shim holders disposed at predetermined circumferential angles on a support cylinder coaxial with the magnet. Each shim holder accommodates a magnetic shim element consisting of a first and a second magnetic bar member of distinct lengths and a first and a second non-magnetic tube for accommodating the first and second magnetic bar members therein. The members are positioned by respective stoppers inserted into the tubes.