DESIGN CONSIDERATION OF THE ITER-TF COIL WITH A REACT-AND-WIND TECHNIQUE USING NB3AL CONDUCTOR

The ITER-TF coil requires a generation of 12.5 T in a size of 12 m x 1 8 m. For such a high field-large coil, the applicability of Nb3Al cond uctors was considered with a react-and-wind technique which realizes h igh reliability and low cost for the coil fabrication. The maximum ben ding strain on the Nb3Al conductor in use of this technique is 0.39%. Ic degradation due to the strain is expected to be below 5%. The limit ing current is estimated as 65 kA for 60 kA operation current. Ac loss in the TF coil with Nb3Al conductor is almost the same as with Nb3Sn conductor.