Superconducting magnet

A superconducting magnet comprising:

• a superconducting coil;
• a coolant container containing the superconducting coil in a state where the superconducting coil is immersed in liquid coolant;
• a radiation shield surrounding the coolant container;
• a vacuum container containing the superconducting coil, the coolant container, and the radiation shield;
• a first pipe passing through the vacuum container and the radiation shield and connected to the coolant container, the first pipe including a mounting opening outside the vacuum container;
• a refrigerator inserted in the first pipe through the mounting opening and fixed so as to seal the mounting opening, with a first flow path of the coolant vaporized being defined by the refrigerator and the first pipe;
• a separator disposed in a gap between an inner face of the first pipe and the refrigerator, the separator separating an interior of the first pipe into a part on a coolant container side and a part on a mounting opening side, the separator defining a part of the first flow path;
• a second pipe passing through the vacuum container and the radiation shield and connected to the coolant container, the second pipe defining a second flow path of the coolant vaporized;
• a third pipe connected to the first pipe outside the vacuum container, the third pipe extending in contact with the vacuum container;
• a fourth pipe connected to the second pipe outside the vacuum container, the fourth pipe extending in contact with the vacuum container;
• and
• at least one pressure relief valve connected to the third pipe and the fourth pipe.