Integrated modelling of tungsten accumulation control with wave heating: validation in ASDEX Upgrade and predictions for ITER
Daniel Fajardo, C. Angioni, E. Fable, G. Tardini, R. Bilato, T. Luda, R. M. McDermott, O. Samoylov, the ASDEX Upgrade Team
Abstract
Abstract In present-day fusion devices, central wave heating is crucial to avoid core tungsten (W) accumulation. In this work, we present an integrated modelling framework that reproduces the reduction of core W peaking in ASDEX Upgrade experiments when multiple transport channels are self-consistently evolved, emphasizing the effects of wave heating on turbulent and neoclassical W transport. Predictions for the ITER 15 MA baseline are then provided. We show that the core of a reactor is in a different transport regime for W as compared to present-day tokamaks. The challenges introduced by W arise from global radiation losses that can hinder operation in H-mode, instead of local central accumulation.