Characteristics of round and extracted strands of Nb3Al Rutherford cable

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Long Nb{sub 3}Al strands with copper stabilizer are promising for future high field accelerator magnets. A 1.2 kilometer Nb{sub 3}Al strand with Cu stabilizer was fabricated at the National Institute for Materials Science in Japan. Using this strand a 30 meter Cu stabilized Nb{sub 3}Al Rutherford cable was made for the first time by a collaboration of NIMS and Fermilab. The Nb{sub 3}Al strands extracted from cable with a relatively low packing factor showed almost no J{sub c} degradation. But the extracted strands from the highly compacted cable showed some degradation in both J{sub c} and n value, which may ... continued below

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5 pages

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Kikuchi, A.; Yamada, R.; Ambrosio, G.; Andreev, N.; Barzi, E.; Cooper, C. et al. August 1, 2006.

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Long Nb{sub 3}Al strands with copper stabilizer are promising for future high field accelerator magnets. A 1.2 kilometer Nb{sub 3}Al strand with Cu stabilizer was fabricated at the National Institute for Materials Science in Japan. Using this strand a 30 meter Cu stabilized Nb{sub 3}Al Rutherford cable was made for the first time by a collaboration of NIMS and Fermilab. The Nb{sub 3}Al strands extracted from cable with a relatively low packing factor showed almost no J{sub c} degradation. But the extracted strands from the highly compacted cable showed some degradation in both J{sub c} and n value, which may be caused by local separation of the copper stabilizer. Still, its J{sub c} degradation is lower than that of typical Nb{sub 3}Sn strands. The current limit due to magnetic instability in low field is about 500 A at 4.2 K. The magnetization of the strands, which was measured with balanced coils at 4.2 K, showed large flux jumps, usually around 1.5 T. This value is much larger than the B{sub c2} (4.2 K) of the Nb matrix, which is around 0.4 Tesla. The magnetic instability of the Nb{sub 3}Al strand at low field is not completely understood, but it might be explained by the superconducting coupling current through the Nb matrix.

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5 pages

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  • Presented at Applied Superconductivity Conference (ASC 2006), Seattle, Washington, 27 Aug - 1 Sep 2006

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  • Report No.: FERMILAB-CONF-06-295-TD
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 899983
  • Archival Resource Key: ark:/67531/metadc889408

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  • August 1, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 22, 2016, 10:13 p.m.

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Kikuchi, A.; Yamada, R.; Ambrosio, G.; Andreev, N.; Barzi, E.; Cooper, C. et al. Characteristics of round and extracted strands of Nb3Al Rutherford cable, article, August 1, 2006; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc889408/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.