Study of Nb/sub 3/Sn strand with enhanced characteristics for ITER

The results of the study of perspective Nb/sub 3/Sn strands of new layout, which can be used for ITER-FEAT magnetic system, are presented. A new approach allowed to provide more uniform distribution of superconducting filaments in the strand cross-section. These strands, made by the bronze route, contain 7600 filaments artificially doped with titanium. The external Cu stabilizer is separated from the bronze/filament matrix by a Ta/Nb diffusion barrier. The properties of the superconductor meet the new ITER specifications. The critical current density of the strands (0.7-0.8 mm in diameter) at 12 T and 4.2 K, is above 700 A/mm/sup 2/, while the hysteresis loss is lower than 190 mJ/cm/sup 3/ at /spl plusmn/3 T.