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Improvement of critical current density and residual resistivity on jelly-roll processed Nb(3)Al superconducting wires

Ayai, N ; Mikumo, A ; Yamada, Y ; Takahashi, K ; Sato, K ; Koizumi, N ; Ando, T ; Sugimoto, M ; Tsuji, H ; Okuno, K ; Mitchell, N

IEEE transactions on applied superconductivity, 1997-06, Vol.7 (2), p.1564-1567 [Periódico revisado por pares]

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Título:
Improvement of critical current density and residual resistivity on jelly-roll processed Nb(3)Al superconducting wires
Autor: Ayai, N ; Mikumo, A ; Yamada, Y ; Takahashi, K ; Sato, K ; Koizumi, N ; Ando, T ; Sugimoto, M ; Tsuji, H ; Okuno, K ; Mitchell, N
É parte de: IEEE transactions on applied superconductivity, 1997-06, Vol.7 (2), p.1564-1567
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
Descrição: The residual resistivity of copper stabilizer (rho), is deteriorated by the diffusion of chromium plated on the strand surface during heating of Nb(3)Al strands. To improve this degradation, the copper stabilizer has been located on the center of the cross-section of the strand rather than near the strand surface. As a result, rho is improved to one-sixth of previous value achieving 1.6x10(-10) Omicronm in a laboratory scale strand. The critical current density (J(c)) of this strand was 715 A/mm(2) at 12 T. This technique was applied to prototype strands to be used in a Nb(3)Al Insert Coil developed in ITER R&D programme resulting in a rho of 1.5x10(-10) Omicronm, which meets ITER specification. In addition, the improvement of J(c) was also studied by two-stage reaction including a continuous heating procedure, which resulted in a J(c) of 1130 A/mm(2) at 12 T and good longitudinal uniformity
Idioma: Inglês

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