| Autor: |
Herrmann, P.F., Beghin, E., Duperray, G., Legat, D., Leriche, A., Brouard, D., Manuel, P. |
| Předmět: |
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| Zdroj: |
IEEE Transactions on Applied Superconductivity; 1997, Vol. 7 Issue 2, p1679-1682, 4p |
| Abstrakt: |
Within Alcatel Alsthom Group, Alcatel Cable and Alcatel Alsthom Recherche Center have undertaken a HTc research program, with support from EDF: the aim was to develop conductors suitable for AC applications, where major market opportunities are expected. For AC applications at 50 Hz low AC loss conductors with a resistive matrix material and a twist length of the superconducting filaments of less than 10 mm are required. Bi-2223 and Bi-2212 conductors are fabricated up to lengths of 200 m of 64 filaments tape by the patented rectangular Alcatel Alsthom route. Recently Bi-2212 conductors for 20 K applications have been tested at liquid helium temperatures. Different Bi-2212 conductors with a twist length of 7 to 9 mm, with a silver-alloy matrix and a cross section of 0.5 mm/spl times/3 mm have been realised. In such conductors transport currents of 400-500 A have been measured at 4 K in self fields with a very good reproducibility. The engineering current density in the wire has reached the threshold value of J/sub C/=30'000 A/cm/sup 2/. The superconducting volume fraction of the conductor is 18% which results in a critical current density in the superconductor of J/sub C/=170'000 A/cm/sup 2/. At liquid nitrogen temperature transport currents of 18 A are carried in this conductor. For this temperature range the development of a Bi-2223 conductor is under progress. For instance, different untwisted conductors with transport currents up to I/sub C/(77 K)=60 A and critical current densities up to are realised. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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