ac losses of bronze-processed (Nb1−xZrx)3Sn between 5 and 16 K

ac losses of bronze-processed Nb3Sn tapes were measured between 5 and 16 K. Additions of up to 5% Zr to the Nb substrate were found to cause only a slight increase in loss. However, because of the increased Tc of the NbZr substrate as compared to pure Nb, such additions appear advantageous in some ac applications. The lowest losses were obtained for an anodized sample of (Nb–1% Zr)3Sn (e.g., 11 μW/cm2 at 500 rms A/cm and 12 K).