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100 m long 6-filament MgB2 wire was successfully fabricated using internal magnesium diffusion (IMD) process [1]. We investigated the transport properties and the uniformity of this long multifilament IMD wire. The MgB2 layer and the sub-filament region are regular, and the Jc values have a fairly homogenous distribution throughout the wire, suggesting that there were no obvious defects along the length of the wire. A layer Jc as high as 1.2×10^5 A/cm2 at 4.2 K and 8 T was obtained, which was comparable to the highest value of the long multifilament IMD wire reported so far.
We also made and tested two IMD-processed MgB2 solenoid coils using 26 m long 6-filament wires. The coils were prepared by using a wind-and-react method and cooled by liquid helium. The coil Ic values measured at 4.2 K are almost equal to the estimated Ic values of short length wire, suggesting that the long multi-filamentary wire has sufficient longitudinal homogeneity. These results indicate that the long multifilament IMD-processed MgB2 superconducting wire is suitable for practical applications.
[1] Dongliang Wang, Da Xu, Xianping Zhang, Chao Yao, Pusheng Yuan, Yanwei Ma, Hidetoshi Oguro, Satoshi Awaji, Kazuo Watanabe, Uniform transport performance of a 100 m-class multifilament MgB2 wire fabricated by an internal Mg diffusion process, Supercond. Sci. Technol., 2016, 29(6):065003.