DESIGN AND FABRICATION OF SUPERCONDUCTING CABLES FOR ITER CENTRAL SOLENOID MODEL COIL

The Nb3Sn cable is being fabricated for the Central Solenoid (CS) Mode l Coil under the ITER Engineering-Design Activity. The cable consists of about 1000 strands whose diameter is 0.81 mm. The design current is 48 kA at a magnetic field of 13 T. The 0.6-GJ CS model coil is operat ed in a pulse mode (0.5 T/s). The first trial fabrication of a 100-m d ummy cable and a 20-m superconducting cable was completed successfully . The second trial fabrication of a 1000-m dummy table was performed t o establish the stable manufacturing procedure in January, 1995. We me asured the AC losses of the full-sized conductor and could determine t he cable coupling time constant. We analyzed the heat generation of th e CS model coil and calculated the temperature rise of the cable for t he model coil.