Conductors of the ITER magnets

Nb/sub 3/Sn and NbTi cable in conduit conductors (CICCs) cooled by a supercritical 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 superconducting 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 conductor design and the main results of the conductor thermohydraulic analysis are discussed including consideration of nonuniform current distribution among superconducting strands.