TY - JOUR
T1 - AC loss, inter-strand resistance, and mechanical properties of an option-II ITER CICC up to 30,000 cycles in the press
AU - Miyoshi, Y.
AU - Ilyin, Y.
AU - Abbas, W.
AU - Nijhuis, A.
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
KW - 2023 OA procedure
U2 - 10.1109/TASC.2010.2088355
DO - 10.1109/TASC.2010.2088355
M3 - Article
SN - 1051-8223
VL - 21
SP - 1944
EP - 1947
JO - IEEE transactions on applied superconductivity
JF - IEEE transactions on applied superconductivity
IS - 3
ER -