Electromagnetic and mechanical characterisation of ITER CS-MC conductors affected by transverse cyclic loading: II. Interstrand contact resistances

Arend Nijhuis, Niels H.W. Noordman, Herman H.J. ten Kate, Neil Mitchell, Pierluigi Bruzzone

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Abstract

A special cryogenic press has been built to study the mechanical and electrical properties of full-size ITER multistrand Nb3Sn cable-in-conduit conductor samples under transverse, mechanical loading. This simulates the transverse magnetic force that occurs when the conductors are used in a coil. The cryogenic press can transmit a variable (cyclic) force up to 650 kN/m to a cable section of 400 mm length at 4.2 K. The jacket is opened partly in order to transmit the force directly onto the table. The various interstrand contact resistances (Rcs) between strands selected from sub-cables at different positions inside the cable are measured. A summary of the results obtained with up to several tens of full loading cycles is presented. The cables consist of six last stage sub-cables (petals) which are wrapped with an Inconel 600 ribbon. A significant increase of the intra-petal Rc after several cycles is observed. An opposite effect is noticed for the inter-petal Rc. Upon applying a load of 650 kN/m, the Rc drops for the intra-petal as well as for the inter-petal resistance with respect to zero load.
Original languageEnglish
Pages (from-to)754-757
JournalIEEE transactions on applied superconductivity
Volume9
Issue number2
DOIs
Publication statusPublished - 1999
Event1998 Applied Superconductivity Conference, ASC 1998 - Desert Springs Resort, Palm Desert, United States
Duration: 13 Sep 199818 Sep 1998

Keywords

  • Niobium alloys
  • Electric resistance measurement
  • Fusion reactor design
  • Superconducting cables
  • Magnetic forces
  • Superconducting coils
  • Superconducting magnets
  • Contact resistance
  • Magnetic force microscopy
  • Tin alloys

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