A fine-filamentary CuZn sheathed MgB_(2)wires produced by Hyper Tech Inc were used for 12 strand Rutherford cable of thickness 0.70-0.76 mm.Critical currents of short cable samples were measured at 4.2 K and external ...A fine-filamentary CuZn sheathed MgB_(2)wires produced by Hyper Tech Inc were used for 12 strand Rutherford cable of thickness 0.70-0.76 mm.Critical currents of short cable samples were measured at 4.2 K and external fields 4.0-8.0 T and also at temperatures 15-25 K and magnetic fields 1.0-5.5 T.The threshold of engineering current density J_(e)=10^(4)Acm^(-2)for the cable size of 0.72 mm×2.55 mm was obtained at field of 4.5 T and temperature 4.2 K and at 2.3 T for 20 K,respectively.Magnetization measurements of the cable with transposed strands and twisted 20μm filaments have shown reduced AC losses,but,the coupling currents loss contribution was still visible.AC losses measured for the same size Rutherford cable made of single-core wires demonstrate the effect of well decoupled filaments.Consequently,the cabling of thin single-core MgB_(2)wires shows a promising way for low loss conductors suitable for AC applications.展开更多
基金funded by the EU NextGenerationEU through the Recovery and Resilience Plan for Slovakia under the project No.09I04-03-V02-00039.
文摘A fine-filamentary CuZn sheathed MgB_(2)wires produced by Hyper Tech Inc were used for 12 strand Rutherford cable of thickness 0.70-0.76 mm.Critical currents of short cable samples were measured at 4.2 K and external fields 4.0-8.0 T and also at temperatures 15-25 K and magnetic fields 1.0-5.5 T.The threshold of engineering current density J_(e)=10^(4)Acm^(-2)for the cable size of 0.72 mm×2.55 mm was obtained at field of 4.5 T and temperature 4.2 K and at 2.3 T for 20 K,respectively.Magnetization measurements of the cable with transposed strands and twisted 20μm filaments have shown reduced AC losses,but,the coupling currents loss contribution was still visible.AC losses measured for the same size Rutherford cable made of single-core wires demonstrate the effect of well decoupled filaments.Consequently,the cabling of thin single-core MgB_(2)wires shows a promising way for low loss conductors suitable for AC applications.
