Design of the Nb/sub 3/Al insert to be tested in ITER central solenoid model coil

Critical current of Nb/sub 3/Al is less sensitive to strain than Nb/sub 3/Sn. This characteristic makes a react-and-wind method applicable in a large dimension coil. By applying the react-and-rind method for toroidal field (TF) coil, technical difficulties in transfer of the conductor after reaction are eliminated and construction cost of magnet system can be reduced in comparison with a wind-react-insulate-transfer method. Therefore, the Nb/sub 3/Al conductor has large potential as candidate for the TF conductor. The experiment of a 60 kA-12.5 T Nb/sub 3/Al insert is projected to demonstrate applicability of the react-and-wind method with the Nb/sub 3/Al conductor. The react-and-wind method will be employed in the winding and 0.4% bending strain will be applied to the conductor. The major characteristics of the Nb/sub 3/Al insert are reported in this paper.