Abstract

We have prepared Nb3Sn strands by the internal tin process for superconducting conductor application in the international thermonuclear experimental reactor (ITER). The multifilamentary Nb3Sn strands have a diameter of 0.82mm and a unit length longer than 5000m. We have investigated the effect of twist process on superconducting critical current density and hysteresis loss for Nb3Sn strands. It has been found that the twist process significantly reduces the hysteresis loss of the strands, while the critical current density and the n-value remain nearly unchanged.

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