Development of magnetic control for the EU-DEMO flight simulator and application to transient phenomena

This paper presents a first implementation of DEMO tokamak (Donné, 2019) [1] configuration including CREATE magnetic controllers in the Fenix flight simulator environment. Fenix is based on the 1-D transport code ASTRA (Pereverzev and Yushmanov, 2002 [2] and Fable et al., 2013) [3], coupled with the 2-D equilibrium solver SPIDER (Ivanov et al., 2005) [4]. Following the successful demonstration on ASDEX Upgrade (Herrmann and Gruber, 2003) [5]), it was clear that this environment could be fruitfully used to simulate DEMO scenarios including both magnetic and kinetic control strategies. In order to design magnetic controllers, first a systematic validation of the plasma linearized dynamic response has been successfully carried out. This dynamic response has been used to design and tune a first version of magnetic controllers including vertical stability, plasma shape and plasma current control. Simulations of both the plasma flat-top phase including H to L transition, and of the ramp-up phase are presented to show the effectiveness of the proposed simulator and of the magnetic control solution.