PROBLEM TO BE SOLVED: To provide a superconducting magnet with which the temperature of the permanent current switch can be quickly lowered and the excitation time of the superconducting magnet can be shortened, and also to provide an MRI apparatus and an NMR apparatus comprising the superconducting magnet.SOLUTION: A superconducting magnet structure is disclosed in which a superconducting coil 1 is connected to a second stage 22 of a refrigerating unit 2 through a highly thermal conductor 3 on the low temperature side and a permanent current switch 4 covered by a highly thermal conductor 5 is connected to a second stage 22 of the refrigerating unit 2 through a heat insulator 6 and the highly thermal conductor 3 on the low temperature side. Gas is supplied from a gas cylinder 8 disposed outside a vacuum vessel 16 to a condenser 11 in a thermal shield 12. In addition, a first pipe 14 that supplies the condensate to a liquid reservoir chamber 7 is provided, which liquid storage chamber 7 is mounted on an upper portion of the permanent current switch 4, and a check valve 13 is connected to the first pipe 14.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】永久電流スイッチの温度を高速に冷却することができ、超電導磁石の励磁時間の短縮化が可能な超電導磁石とそれを備えたMRI装置、NMR装置を提供する。【解決手段】超電導コイル1が冷凍機2の第2ステージ22と低温側高熱伝導体3を介して連結されており、高熱伝導体5で覆われた永久電流スイッチ4が断熱材6および低温側高熱伝導体3を介して冷凍機2の第2ステージ22と接続した超電導磁石構造とし、真空容器16外部のガスボンベ8からガスを熱シールド12内の凝縮器11に供給し、さらに、凝縮液を液溜室7に供給する第1配管14を設け、液溜室7を永久電流スイッチ4の上部に設置して、逆止弁13を第1配管14に接続した。【選択図】 図1
