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Superconducting Magnet
A superconducting magnet is an electromagnet constructed from coils of superconducting wire that operate at temperatures below their critical temperature, at which the electrical resistance of the conductor vanishes and the material expels internal magnetic flux through the Meissner effect [1]. Because the zero-resistance state permits large persistent currents to circulate in a closed loop without Joule heating, such magnets can sustain intense, highly stable magnetic fields with negligible steady-state power consumption compared with conventional resistive electromagnets [2]. The winding must be maintained at cryogenic temperature, typically by liquid helium cooling for low-temperature superconductors such as niobium-titanium, and the design must account for the critical surface that bounds the combinations of current density, magnetic field, and temperature within which superconductivity is preserved [3]. The complete magnet system includes a superconducting winding, a cryostat, a power supply for energizing the coil, and protection circuitry that rapidly discharges stored energy if a localized transition to the normal state, or quench, occurs.
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  • 24 Sep 2026
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