Nb3Sn Wire Shape and Cross-Sectional Area Inhomogeneity in Rutherford Cables

Una M. Kelly, Sven Richter, Claudia Redenbach, Katja Schladitz, Christian Scheuerlein*, Felix Wolf, Patrick Ebermann, Friedrich Lackner, Daniel Schoerling, Dietmar Meinel

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)
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Abstract

During Rutherford cable production, the wires are plastically deformed and their initially round shape is distorted. Using X-ray absorption tomography, we have determined the three-dimensional shape of an unreacted Nb3Sn 11-T dipole Rutherford cable and of a reacted and impregnated Nb3Sn cable double stack. State-of-the-art image processing was applied to correct for tomographic artifacts caused by the large cable aspect ratio, for the segmentation of the individual wires and subelement bundles inside the wires, and for the calculation of the wire cross-sectional area and shape variations. The 11-T dipole cable cross section oscillates by 2% with a frequency of 1.24 mm (1/80 of the transposition pitch length of the 40 wire cable). A comparatively stronger cross-sectional area variation is observed in the individual wires at the thin edge of the keystoned cable where the wire aspect ratio is largest.

Original languageEnglish
Article number8253533
JournalIEEE transactions on applied superconductivity
Volume28
Issue number4
DOIs
Publication statusPublished - Jun 2018
Externally publishedYes

Keywords

  • Image processing
  • Nb3Sn
  • Quantitative
  • Rutherford cable
  • Tomography

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