抄録
Nb3Sn strands of high current density and low hysteresis loss have been developed using bronze process and internal tin diffusion process for fusion superconducting pulse magnets. 13.6 tons of strands have been manufactured in total. Critical current has been improved up to 125-150% and hysteresis losses have been reduced to 1/3-1/4 compared with strands developed in the past in JAERI. Using strands, large scale conductors for ITER demonstration have been manufactured, which are designed to carry an operating current of 46kA under a field of 13 T.
