Conductors of the ITER magnets

Nb3Sn and NbTi Cable in Conduit Conductors (CICCs) cooled by a supercritica l helium forced flow are considered in the ITER magnets. The design of the various CICCs relies on consideration of cost and manufacture as well as on the R&D performed on conductors for the ITER Model Coils. The amount of su perconducting strand is optimized to satisfy operational requirements such as a minimum temperature margin, a heat power balance for stability (Stekly parameter), and a maximum hot spot temperature in case of quench, The cond uctor design and the main results of the conductor thermohydraulic analysis are discussed including consideration of nonuniform current distribution a mong superconducting strands.