Electromechanical Modeling of Nb3Sn Superconducting Wires Subjected to Periodic Bending Strain

Marco Breschi, Pier Luigi Ribani, Frederico Scurti, Arend Nijhuis, Hugo Bajas, Arnaud Devred

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The transport performance of Nb3Sn cable-inconduit conductors (CICCs) depends on the strain distribution along the superconducting filaments determined by the combination of electromagnetic and mechanical forces applied to the strands. Experimental studies on the effect of bending strain were performed at the University of Twente by means of the Test Arrangement for Strain Influence on Strands (TARSIS) facility. The aim of this paper is to verify the agreement between a detailed electromechanical model of the wire and the experimental results obtained in TARSIS. A numerical model of two Nb3Sn internal tin strands was developed, which describes the wire through a distributed parameter nonlinear electrical circuit. The model requires a single strand to be discretized into a number of elements, connected by transverse conductances and subjected to a given strain distribution. The strain distribution maps were computed at the École Centrale Paris by means of the MULTIFIL code at different experimental conditions in the TARSIS facility. The simulation results show good agreement with the experimental ones in terms of both critical current and n-value degradation.
Original languageEnglish
Article number8400805
JournalIEEE transactions on applied superconductivity
Issue number3
Publication statusPublished - 2015
Event2014 Applied Superconductivity Conference, ASC 2014 - Charlotte Convention Center, Charlotte, United States
Duration: 10 Aug 201415 Aug 2014


  • Bending strain
  • Degradation
  • Electromechanical modeling
  • Nb3Sn wires

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