Using it. Those magnets depends on superconducting, which is only possible at low, really low temperatures (often close to absolute zero at 0K). Also the energy that generates the magnetic field also generates a lot of heat. So we cool those magnets with liquid nitrogen.
Also the problem isn’t the liquid nitrogen but rather the liquid helium that is needed to reach the really low temperature ranges. Because helium is more scarce and expensive.
Still requires liquid nitrogen
Well, we can’t make that. Too bad. Sounded useful.
To make, or to use?
Using it. Those magnets depends on superconducting, which is only possible at low, really low temperatures (often close to absolute zero at 0K). Also the energy that generates the magnetic field also generates a lot of heat. So we cool those magnets with liquid nitrogen.
Also the problem isn’t the liquid nitrogen but rather the liquid helium that is needed to reach the really low temperature ranges. Because helium is more scarce and expensive.