Conductor Development Project (CDP)
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Conductor Development Project (CDP) Evaluating Nexans powders for Bi-2212 Round Wire Fabrication . Yibing Huang, Hanping Miao, Seung Hong, Michael Gerace and Jeff Parrell Oxford Superconducting Technology. Acknowledgements

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Conductor development project cdp

Conductor Development Project (CDP)

Evaluating Nexans powders for Bi-2212 Round Wire Fabrication

Yibing Huang, Hanping Miao, Seung Hong, Michael Gerace and Jeff Parrell

Oxford Superconducting Technology

Acknowledgements

U.S. DOE –High Energy Physics CDP, Lawrence Berkeley National Laboratory & ASC - Florida State University

EuCARD2 Meeting

CERN, Dec. 12, 2013


Conductor development project cdp

CDP Project

Compare 3 powders recently produced by Nexans in Lot #82 with different particle size distributions

Regular ultra-fine powder (d50 ~ 1 µm)

Standard granulated powder with particle size of 200-500 µm

Special granulated powder with narrower particle size in 100-200 µm


Conductor development project cdp

Bi-2212 Wire Characterization Summary


Conductor development project cdp

Wire Cross-Section Comparison

PMM130723-1 (1mm, FF~29%)

PMM130723-2 (200-500 mm, FF~22%)

PMM130723-3 (100-200 mm, FF~23%)

  • Fill factor of the wires made of granulated powder is on purposely made lower than that of the regular ultra fine powder.

  • Wiresmade of the granulated powders have relatively higher homogeneity and less filament merges after drawn to final size.


Conductor development project cdp

Regular Ultra Fine Powder Wire Cross-Section Comparison

Wire from this work, FF ~29%

Wire from old work, FF ~26%

  • Both wires were made withultra-fine powder (d50 ~ 1 µm) and the same process conditions.

  • Fill factor and filament merging appear different.

  • 16 hard particles per 60 sample cross-sections in samples from this work and none from wires with standard powder made in 2005.


Conductor development project cdp

Granulated Powder Wire Cross-Section Comparison

Wire from old work, 100-500 mm powder

Wire from this work, 200-500 mm powder

  • No significant difference in fill factor between wires made of old and new powders.

  • Some hard particles were observed in the new wires, none in the wires made before 2007.


Conductor development project cdp

Wire Performance Comparison

  • The JE performance is the similar in all three billets, showing that slightly better on wire PMM130723-2 by the granulated powder with particle size of 200-500 m.

  • The JE performance is similar for all three billets,

  • Jcis clearly higher in wires with the granulate powder.


Conductor development project cdp

Hard Particles Observed in New Wires

Ultra fine powder, ~1m)

0.8mm wire (granulated powder, 100-200 mm)

  • Hard particles are observed in all three new wires and the higher frequency of hard particles occurred in the wires with 1 mm and 100~200 mm powders.

  • Most of hard particle are 10~40 mm, not to causing wire breakage, but leading to filament merge. Some of them are slightly Bi-rich and Cu deficit.

  • Eliminating hard particle is important to keep wire uniformity and piece-length.


Conductor development project cdp

Summary

  • All three wires are fabricated into single piece without breakage.

  • The JE performance is similar for all three billets, but Jc is clearly better on wires made of granulated powder.

  • Hard particles were observed in all three wires.

  • Need to remove the hard particle.


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