Superconducting magnet

A superconducting magnet comprising:

• a superconducting coil;
• a refrigerant container to contain the superconducting coil in a state where the superconducting coil is immersed in a liquid refrigerant;
• a vacuum container to contain the refrigerant container;
• a discharge pipe connected to the refrigerant container from outside of the vacuum container, the discharge pipe discharging the refrigerant that has been vaporized;
• a pair of external leads electrically connected respectively to opposite ends of the superconducting coil from a position outside of the vacuum container, so as to cause a current to flow through the superconducting coil;
• and
• a protection circuit electrically connected to the superconducting coil, the protection circuit consuming energy stored in the superconducting coil during quenching,
• the protection circuit being in contact with the discharge pipe outside of the vacuum container, wherein
• the protection circuit is wrapped around the discharge pipe outside of the vacuum container,
• the discharge pipe has a helical groove formed on its outer circumferential surface, with a direction in which the discharge pipe extends as an axial direction of a central axis of the groove, and
• the protection circuit is wrapped around the discharge pipe so as to be located within the groove.