Nb3Sn wire shape and cross sectional area inhomogeneity in Rutherford cables

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 3D shape of an unreacted Nb3Sn 11 T dipole Rutherford cable, and of a reacted and impregnated Nb3Sn cable double stack. State-o...

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Bibliographic Details
Published inarXiv.org
Main Authors Kelly, U, Richter, S, Redenbach, C, Schladitz, K, Scheuerlein, C, Wolf, F, Ebermann, P, Lackner, F, Schoerling, D, Meinel, D
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 26.11.2017
Subjects
Aspect ratio
Cables
Deformation mechanisms
Dipoles
Image processing
Image segmentation
Inhomogeneity
Physics - Accelerator Physics
Product design
Wire
X ray absorption
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Summary: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 3D 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 artefacts 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1711.09421