With MRI magnets , what measurements are used to define the field strength ?
Once or twice a day , as the protons are accelerated from 450 GeV to 7 TeV , the field of the superconducting bending magnets will be increased from 0.54 T to 8.3 T. The central solenoid and toroidal field superconducting magnets designed for the ITER fusion reactor use niobium - tin ( Nb3Sn ) as a superconductor .