PROBLEM TO BE SOLVED: To provide a method and a device capable of suppressing reduction of a current flowing through a superconducting coil, at a time of abnormality when a power supply and the superconducting coil are disconnected, in a superconducting magnet device for generating a magnetic field by feeding a current to the superconducting coil.SOLUTION: A superconducting magnet device 10 including a superconducting coil 3 formed of a high temperature superconducting wire, a power supply 5 for feeding a current to the superconducting coil 3, and a protective device 9 capable of forming a short circuit route for short-circuiting the opposite ends of the superconducting coil 3, is installed. Subsequently, a magnetic field is generated in the superconducting coil 3, by feeding a current from the power supply 5 to the superconducting coil 3 in superconducting state. Thereafter, when abnormality of superconducting magnet device 10 is detected, or when the power supply 5 and the superconducting coil 3 are disconnected, a short circuit route is formed by the protective device 9.SELECTED DRAWING: Figure 3【課題】超伝導コイルに電流を流して磁場を発生させる超伝導磁石装置において、電源と超伝導コイルとが互いに切り離された異常時に、超伝導コイルを流れる電流の減少を抑えることができる方法と装置を提供する。【解決手段】高温超伝導線で形成された超伝導コイル３と、超伝導コイル３に電流を供給する電源５と、超伝導コイル３の両端部を互いに短絡させる短絡経路を形成可能な保護装置９とを備える超伝導磁石装置１０を設置する。次に、電源５からの電流を超伝導状態の超伝導コイル３に流すことにより、超伝導コイル３に磁場を発生させる。その後、超伝導磁石装置１０の異常が検出された場合、又は、電源５と超伝導コイル３とを互いに切り離す場合に、保護装置９により短絡経路を形成する。【選択図】図３
