Preliminary Electromagnetic Design for Divertor of FAST

Fusion Advanced Study Torus (FAST) has been designed with the aim to tackle the power exhaust problem with bulk plasma ITER and DEMO relevant. Considerable R&D effort has been spent in EM designing of FAST Divertor components capable of withstanding the expected electromagnetic loads from the foreseen FAST operative conditions. The EM loads are one of the most critical load conditions for the Divertor during Plasma Disruptions and a first dimensioning of the Divertor for EM loads is mandatory. FAST Divertor structure is foreseen compact and the configuration is aimed to give to the structure the required mechanical and thermal capability as well as the remote handling features. The conceptual EM design of the Divertor has been drawn for FAST operative conditions and for "Snow Flake" (SF) magnetic topology DEMO relevant. Recently a "Snow Flake" (SF) [1] magnetic topology has been suggested for the divertor region, capable to spread the plasma power flow on a much wider areas, with the possibility of reducing to up a factor 4 the power flowing to the divertor tiles. The conceptual design of the Divertor has been obtained during an R&D activities based on the estimation of EM loads due to a typical Vertical Disruption Event (VDE) in FAST and for SF magnetic topology.