Submitted by TheLapisBee t3_z80kte in explainlikeimfive
NappingYG t1_iy93ns0 wrote
It uses electromagnets, that run insane ammount of electric current in order to generate required magnetic field. The only way to achieve it, that we currently know of, is by using superconductors - materials that allow electricity flow with very very little losses. (Electrical resistance of conductors increases with temperature) Superconductivity is achieved by cooling the material to as close to absolute zero as possible.
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