NDLI: Development of twisted Bi-2212 and Bi-2223 powder in tube conductors for AC applications

Content Provider	IEEE Xplore Digital Library
Author	Herrmann, P.F. Beghin, E. Duperray, G. Legat, D. Leriche, A. Brouard, D. Manuel, P.
Copyright Year	2002
Abstract	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.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1679
Ending Page	1682
Page Count	4
File Size	722338
File Format	PDF
ISSN	10518223
Volume Number	7
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Powders Conductors Conducting materials Superconducting materials Temperature Superconducting filaments and wires Critical current density Market opportunities Testing
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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