Electromagnetic and mechanical characterisation of ITER CS-MC conductors affected by transverse cyclic loading: I. Coupling current loss

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

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    Abstract

    The magnetic field generated by a coil acts on the cable which results in a transverse force on the strands. This affects the interstrand contact resistances (Rc), the coupling current loss and current redistribution during field changes. A special cryogenic press has been built to study the mechanical and electrical properties of full-size ITER conductor samples under transverse, mechanical loading. The cryogenic press can transmit a variable (cyclic) force up to 650 kN/m to a conductor section of 400 mm length at 4.2 K. The jacket is partly opened in order to transmit the force directly onto the cable. In addition a superconducting dipole coil provides the magnetic field required to perform magnetisation measurements using pick-up coils. The various Rc's between strands selected from different positions inside the cable have been studied. The coupling loss time constants (nτ) during and after loading are verified for the Nb3Sn, 45 kA, 10 and 13 T, ITER Model Coil conductors. A summary of the results obtained with up to several tens of full loading cycles is presented. A significant decrease of the cable nτ after several cycles is observed. The values of the nτ's are discussed with respect to the Rc measurements and a multiple time constant model (MTC).
    Original languageEnglish
    Pages (from-to)1069-1072
    Number of pages4
    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
    • Fusion reactor design
    • Superconducting cables
    • Magnetic fields
    • Magnetic variables measurement
    • Magnetisation
    • Tin alloys
    • Superconducting coils
    • Contact resistance
    • Cryogenics
    • Loss measurement

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