Investigation the Influence of the Nb3Sn Wire Design Parameters and Twist Pitch on Hysteresis Losses
Hysteresis losses of bronze — processed Nb3Sn wires with different design parameters were investigated. Magnetization curves and hysteresis losses were analyzed for Nb3Sn wires with numbers of filaments from 7225 up to 44521, with different design and material of diffusion barriers (Nb, Ta, Nb+Ta) and with twist pitch varying from 20 to 3 mm.
It was shown that the minimum losses were measured in the Nb3Sn wires with Ta diffusion barriers. For Nb3Sn wires with combined Nb-Ta diffusion barriers, the level of hysteresis losses depended on the thickness of Nb layer. A decrease of the twist pitch resulted in a steady decrease of hysteresis losses in the Nb3Sn conductors investigated.
KeywordsDiffusion Barrier Critical Current Density Hysteresis Loss Filament Spacing Filament Diameter
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