Overview of Performance Test of Korean CICCs for ITER TF Magnet

The Korean Domestic Agency (KODA) for the International Thermonuclear Experimental Reactor (ITER) project has taken the responsibility of the procurement of cable-in-conduit conductors for the ITER toroidal field magnet. While procuring 27 conductor unit lengths, which are the Korean sharing, 10 conductors have gone through the superconducting performance test, under low temperature and high magnetic field, as one of the final acceptance tests. The sample assembly and instrumentation of various voltage taps and temperature sensors have been done according to the specified procedure, which had been agreed between domestic agencies and the ITER International Organization. The performance test program, which has also been agreed, was carried out. For the assessment of the current sharing temperature
$(T_{cs})$
, the standard analysis procedure has been adopted.
$T_{cs}$
of all samples, at 68 kA and a background field of 10.78 T, after 1000 cyclic current loads are well above the acceptance criterion. By analyzing the electric field as a function of temperature, the effective strain
$(\varepsilon_\mathrm{eff})$
and transition index (
$n$
-value) were reduced, and the behavior of
$\varepsilon_\mathrm{eff}$
will be discussed in terms of the electromagnetic load, i.e.,
$I\times B$
. The effective strain was compared with the physical strain and results with a numerical simulation.