Long length PIT conductors realized by rectangular deformation route

• Published in: Superconductor science & technology 2000-05, Vol.13 (5), p.477-482
• Main Authors: Herrmann, P F, Bock, J, Bruzek, C-E, Cottevieille, C, Duperray, G, Hascicek, J, Legat, D, Leriche, A, Verhaege, T, Parasie, Y
• Format: Article
• Language: English
• Subjects: Applied sciences; Electrical engineering. Electrical power engineering; Electromagnets; Electronics; Exact sciences and technology; Magnetic devices; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Various equipment and components
• ISSN: 0953-2048; 1361-6668
• DOI: 10.1088/0953-2048/13/5/309

Alcatel pursues the development of multifilamentary Bi-2212 and Bi-2223 tape conductors by the rectangular deformation route. It is shown by a simple cost evaluation that the Bi-2212 conductor represents today the optimum cost versus performance solution for applications in the intermediate temperature range 20-30 K. This interest in the Bi-2212 conductor is related: (1) to higher current density in the intermediate temperature range and (2) to the higher stability range at the formation temperature of the superconducting phase in the silver matrix which results in a simple single-step heat treatment. For the assessment of the conductors' homogeneity, studies of reacted conductors for R&W application have been realized. Kilometre lengths are available for the W&R process and hectometric lengths of fully reacted conductors with good tolerance to bending are available for the R&W process. The Bi-2223 conductor remains of course the best solution for power engineering applications at 77 K. The Alcatel conductor which is realized by the rectangular route shows a strongly reduced field dependency compared to conventional PIT conductors.