Transport properties up to 1000 A of Nb3Sn wires under transverse compressive stress

B. Seeber, A. Ferreira, V. Abächerli, T. Boutboul, L. Oberli, R. Flükiger

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The effect of transverse compressive stress on the superconducting transport currents of multifilamentary Nb3Sn wires have been measured at 19 T using a newly developed probe allowing gauge lengths as long as 125 mm. Two different wire types have been studied: an experimental Bronze Route wire (from our laboratory) with 14'641 filaments of 4.5 μm diameter and a RRP Internal Sn wire (from OST), with 60 filament bundles, each having a diameter of 70 μm. It was found that the RRP wire exhibits higher stress sensitivity. For the Bronze Route wire our data also comprise a comparison of the I c behavior for rectangular and round cross sections. The problem of current transfer has been solved using a new type of Walters spring (one turn). The spring has been cut parallel to the wire sample into two parts so the measured sample length covers a whole turn. One part can be moved axially and forces up to 40 kN are applicable. The new device will be used for the investigation of various types of superconducting wires, comprising Nb 3Sn and Nb3Al, in view of their application in systems with high transverse compressive forces, in particular high field dipoles (e.g. NED).

Original languageEnglish
Pages (from-to)2643-2646
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume17
Issue number2
DOIs
StatePublished - Jun 2007
Externally publishedYes

Keywords

  • Niobium alloys
  • Superconducting materials measurements
  • Superconducting materials mechanical factors
  • Superconducting wires

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