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Characteristics of Cu Stabilized {\rm Nb}_{3}{\rm Al} Strands With Low Cu Ratio

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10 Author(s)
Kikuchi, A. ; Nat. Inst. for Mater. Sci., Tsukuba, Japan ; Yamada, R. ; Barzi, E. ; Kobayashi, M.
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Characteristics of recently developed F4-Nb3Al strand with low Cu ratio are described. The overall J c of the Nb3Al strand could be easily increased by decreasing of the Cu ratio. Although the quench of a pulse-like voltage generation is usually observed in superconducting unstable conductor, the F4 strand with a low Cu ratio of 0.61 exhibited an ordinary critical transition of gradual voltage generation. The F4 strand does not have magnetic instabilities at 4.2 K because of the tantalum interfilament matrix. The overall J c of the F4 strand achieved was 80-85% of the RRP strand. In the large mechanical stress above 100 MPa, the overall J c of the F4 strand might be comparable to that of high J c RRP-Nb3Sn strands. The Rutherford cable with a high packing factor of 86.5% has been fabricated using F4 strands. The small racetrack magnet, SR07, was also fabricated by a 14 m F4 cable. The quench current, I q, of SR07 were obtained 22.4 kA at 4.5 K and 25.2 kA at 2.2 K. The tantalum matrix Nb3Al strands are promising for the application of super-cooled high-field magnets as well as 4.2 K operation magnets.

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Applied Superconductivity, IEEE Transactions on  (Volume:19 ,  Issue: 3 )