Modeling techniques for correcting measured data on the ITER toroidal field insert coil

The ITER TFIC (toroidal field insert coil), consisting of a titanium jacketed, 40 m long superconducting CICC (cable-in-conduit conductor) wound on a steel mandrel, was tested at the JAERI facility, Naka Japan in 2001. The tested coil is fully equipped with voltage taps and thermometers distributed in the high field region. As the thermometer responses showed some inconsistency, a re-assessment of the performance of the ITER TFIC CICC has been carried out based on a new thermo-hydraulic model allowing the reconstruction of the cable temperature during T_cs (current sharing temperature) tests. This model is a time dependent model using pressure, temperature and helium mass flow rates measured by reliable sensors attached to the facility. It includes special features such as heat exchange to the cold busbars at the electrical joints and heat exchange to the steel mandrel. A detailed description of the model is given together with the results of the conductor performance analysis carried out on T_cs runs. The impact of the TFIC conductor performance assessment on the ITER TF conductor design is then derived.