AC transport losses of Ag-sheathed Bi2223 multifilamentary twisted tapes

Fukunaga, T.; Itou, T.; Oota, Akio; Maeda, J.; Hiraoka, M.

doi:10.1109/77.620898

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…For large γ k (long twist pitches) θ k,max take lesser values, but changes progressively across the tape, while for small γ k the variation of θ k is concentrated at the edges of the manifold. These results qualitatively follow the experimental findings on tapes with twisted filaments [2,5,6,15] when the metallic cladding sheaths are removed.…”

Section: Description Of the Filament Geometrysupporting

confidence: 88%

“…filaments may be derived. We have modelled the shape of these shells by elliptic cylindrical surfaces of different eccentricity [15]. During the mechanical deformation, going from round wires to flat tapes, these manifolds of filaments deform but maintain their integrity and the use of elliptic coaxial surfaces of different aspect ratios may describe the main features of their morphology.…”

Section: Description Of the Filament Geometrymentioning

confidence: 99%

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Intrinsic limits ofJ_cin composite metallic/Bi(Pb)-2223 multifilamentary tapes with twisted filaments

Navarro¹,

Tundidor²,

Beduz³

et al. 2000

Supercond. Sci. Technol.

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The intrinsic limits of Jc in composite Bi(Pb)-2223 multifilamentary tapes due to the reduction of the effective cross section and the enlargement of the twisted filaments have been analysed. A simple model of the twisted filaments as elliptic helices grouped in concentric shells have been used to derived analytical results for the intrinsic variation of Jc with the twist pitch, tp. In tapes with high thickness to width aspect ratios and large tp values, this model predicts a linear dependence of Jc with 1/tp, when the shape and superconducting filling factor of the tapes are constant. The Jc(tp) values depend on a set of parameters that define the helices, which may be derived from the analysis of the morphology of the filaments inside the tapes. To assess the model we have compared the predictions with the results here reported on Ag and Ag0.94Au0.06 alloy sheathed tapes with 19 and 37 twisted filaments, respectively. In tapes with high Jc, we have found a good agreement between the variation of Jc with tp experimentally measured and the intrinsic limits imposed by the filament geometry.

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Section: Description Of the Filament Geometrysupporting

confidence: 88%

Section: Description Of the Filament Geometrymentioning

confidence: 99%

Intrinsic limits ofJ_cin composite metallic/Bi(Pb)-2223 multifilamentary tapes with twisted filaments

Navarro¹,

Tundidor²,

Beduz³

et al. 2000

Supercond. Sci. Technol.

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“…In this paper, we report the results of critical current measurements and AC loss simulation of a series of BSCCO tapes using the Norris equation with different twist-pitch (8,10,13,30,50, 70 mm and ∞). Experimental AC loss measurements were further performed on three selected tapes with twist pitch of 10, 13, and 70 mm.…”

Section: Introductionmentioning

confidence: 99%

Transport AC losses of Ag-sheathed Bi-2223 tapes with different twist-pitch using electrical methods

Jang¹,

Wong‐Ng²

2005

Supercond. Sci. Technol.

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A series of Bi-2223 ([Bi, Pb]:Sr:Ca:Cu:O = 2:2:2:3) tapes with 37 superconducting core filaments was investigated in an attempt to correlate critical current and alternating current (AC) losses with twist-pitch. The twist-pitch of these multi-filamentary tapes which were produced by the powder-in-(Ag)tube (PIT) method varies from 8, 10, 13, 30, 50, 70 mm to ∞ mm (non-twist). Critical current (I c) measurements which were conducted in zero field by a four-probe method under liquid-nitrogen temperature showed that I c is greater in the non-twist filament than that in twisted filaments. Among these tapes, three (twist-pitch of 10, 13, and 70 mm) were selected for AC loss experiments under a time-varying transport current. The results of AC loss measurements in general agree with that of the AC loss simulation using the ellipse model of the Norris equation. Simulation results show that the hysteretic AC loss is lowest in the non-twist tape and increases as the twist-pitch decreases. A much greater loss was found in tapes with small twist-pitch, i.e. 10 and 8 mm. Among different possible loss contributions to the total AC losses, the hysteretic loss was determined to be the main source. In addition, microstructural damage of tapes with small twist-pitch appears to contribute to the overall AC losses as well.

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AC losses in multifilamentary HTS-composite tapes based on BiPbSrCaCuO

Никулин

Shikov

Akimov

et al. 1998

Physica C: Superconductivity

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AC transport losses of Ag-sheathed Bi2223 multifilamentary twisted tapes

Cited by 5 publications

References 4 publications

Intrinsic limits ofJ_cin composite metallic/Bi(Pb)-2223 multifilamentary tapes with twisted filaments

Intrinsic limits ofJ_cin composite metallic/Bi(Pb)-2223 multifilamentary tapes with twisted filaments

Transport AC losses of Ag-sheathed Bi-2223 tapes with different twist-pitch using electrical methods

AC losses in multifilamentary HTS-composite tapes based on BiPbSrCaCuO

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AC transport losses of Ag-sheathed Bi2223 multifilamentary twisted tapes

Cited by 5 publications

References 4 publications

Intrinsic limits ofJcin composite metallic/Bi(Pb)-2223 multifilamentary tapes with twisted filaments

Intrinsic limits ofJcin composite metallic/Bi(Pb)-2223 multifilamentary tapes with twisted filaments

Transport AC losses of Ag-sheathed Bi-2223 tapes with different twist-pitch using electrical methods

AC losses in multifilamentary HTS-composite tapes based on BiPbSrCaCuO

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Intrinsic limits ofJ_cin composite metallic/Bi(Pb)-2223 multifilamentary tapes with twisted filaments

Intrinsic limits ofJ_cin composite metallic/Bi(Pb)-2223 multifilamentary tapes with twisted filaments