Description of the AC Loss Model for the ITER Central Solenoid During a Plasma Scenario

AC loss is a major heat load in the pulsed, superconducting ITER coils, and thus a design driver for the cryo-system and superconductor. Given the importance of AC loss, extensive AC loss characterization of the components of the ITER coils, from the superconducting strands, cables, long “coil-like” conductors (so called insert-coils) to the completed coils, were conducted over the past years. Recently the first Central Solenoid (CS) modules were factory tested including AC loss tests representative of the operational conditions. The modelling of the AC loss is critical for the preparation of ITER Tokamak operation and commissioning. The following describes the AC loss models for the ITER CS coils. Such models need to be simple to implement and fast to execute to allow simulation of the long ITER plasma scenarios. The paper explains the simplifications applied and discusses the implications. The status of the validations of the model on experimental data are presented.