AC loss, inter-strand resistance, and mechanical properties of an option-II ITER CICC up to 30,000 cycles in the press

Y. Miyoshi, Y. Ilyin, W. Abbas, A. Nijhuis

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Abstract

In Nb 3 Sn cable-in-conduit conductors for ITER, the superconducting strands follow complex trajectories defined by the twist pitches of multi-stage cabling and the void fraction of the conductor. The conductor in operation suffers a Lorentz load which results in distributed strand deformations that alter the overall electromagnetic and mechanical behavior of the conductor. With the Twente cable press, a cable specimen is subjected to transverse load up to 30,000 cycles and the changes in the inter-strand contact resistances, the cable deformation, and the coupling loss are monitored. An ITER toroidal field coil conductor with option-II cabling scheme is tested for the first time in the press. In comparison with previously measured conductors, the long twist pitches of option-II result in a higher inter-strand contact resistance, a lower stiffness of the conductor, and initially a higher coupling loss time constant. Within 100 cycles, the time constant decays to a comparable level as the low void fraction conductor with short twist pitches.
Original languageEnglish
Pages (from-to)1944-1947
Number of pages4
JournalIEEE transactions on applied superconductivity
Volume21
Issue number3
DOIs
Publication statusPublished - 2011

Keywords

  • 2023 OA procedure

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