AC Losses Calculation in the ITER TF Magnets During a Scenario

Abstract

While the ITER Magnet system is being assembled at Cadarache (France), models are being developed on the basis of the conductors test results. The purpose is to prepare the performances extrapolation to magnet commissioning and operation. In particular, the AC losses generated in the conductors during a plasma scenario should be estimated in order to predict potential operating margins reductions and to prevent quenches. In particular, there is the case of AC losses in the conductors of the TF inner leg, where the field variations are both transverse and parallel to the axis of the conductor, during a PF/CS current variation. This paper proposes firstly to review the TF conductors results, extracted from the qualification phase, defining a reduced set of parameters for AC-losses calculation. Then, we propose expressions for calculating losses caused by a parallel field variation. Finally, we analyze a standard ITER scenario, and compute the generated losses, to later be introduced as inputs for thermohydraulic calculations.