The superconducting magnet system for the International Thermonuclear Experimental Reactor (ITER) will consist of 24 toroidal field (TF) coils of 468 tonnes each, a central solenoid (CS) weighing 902 tonnes, and an external poloidal field (PF) set of six coils, the largest of which will have a diameter of 30 m. The coils for the system will be the largest high field superconducting coils ever built. They will require about 1700 tonnes of Nb_3Sn strand and operate at a maximum field at the windings of 13 T. A mechanical configuration where the TF coils are bucked on the CS has been selected. An extensive R&D programme focused on the manufacture and testing of model coils has been initiated.
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