Evaluation Of Current Transfer In Bi-2223/ag Composite Tapes

The evaluation of current transfer effects in normal metal/superconductor interfaces are used in the design of splices and joints of superconducting coils. We evaluated the low electric resistance by applying transport currents up to 100 A and under self magnetic fields using the resistive four probe method as well as the induced persistent current decay method. In the four probe method the resistance was measured at many voltage taps aiming to determine the current-transfer length and the influence sample inhomogeneity. The 155-mm long lap joint resistance of the Bi-2223/Ag tape measured by the induced current decay method 1.1 × 10-8 Ω agrees well with that measured by the four probe method and a 1-m long specimen exhibited inhomogeneity in the I-V curve for different spaced voltage taps. © 2001 Elsevier B.V. All rights reserved.408-4101-4698699Polak, M., (1997) Supercond. Sci. Technol., 10, p. 769Kasztler, A., (1999) IEEE Trans. Appl. Supercond., 9, p. 2340Horng, L., Tai, C.H., (2001) IEEE Trans. Appl. Supercond., 11, p. 300