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We report about the improvements on overall critical current density je, long-length processing, mechanical properties, and insulation. These topics are discussed for Bi-2223/Ag-alloy tapes for typical DC-applications, for AC-applications which require twisted filaments to achieve low-loss properties and for current-lead-applications (EAS is producing Bi-2223/AgMgAu-HTS-tapes for the CERN-LHC-Project). The state-of-the art production of Bi-2223/Ag-alloy tapes at EAS allows for overall current densities of >100 A/mm2. There is progress out of the development line to a value of more than 120 A/mm2, which will be transferred to the production line in the near future. Regarding AC-tapes with twisted filaments, it is possible to prepare tapes without a reduction in overall current density if the preparation parameters are kept within a well defined window. Both types of tapes are available in piece-lengths of up to 1500 m. The requirements on the piece-lengths of Bi-2223/AgMgAu-HTS-tapes for current leads are less stringent. This type of tape is available in piece-lengths up to 300 m with overall current densities up to 90 A/mm2.
Date of Publication: June 2005