Preliminary electromagnetic, thermal and mechanical design for first wall and vacuum vessel of FAST

tThe fusion advanced study torus (FAST), with its compact design, high toroidal field and plasma current,faces many of the problems met by ITER, and at the same time anticipates much of the DEMO relevantphysics and technology. The conceptual design of the first wall (FW) and the vacuum vessel (VV) has beendefined on the basis of FAST operative conditions and of “Snow Flakes” (SF) magnetic topology, which isalso relevant for DEMO.The EM loads are one of the most critical load components for the FW and the VV during plasmadisruptions and a first dimensioning of these components for such loads is mandatory.During this first phase of R&D activities the conceptual design of the FW and VV have been assessedestimating, by means of FE simulations, the EM loads due to a typical vertical disruption event (VDE) inFAST. EM loads were then transferred on a FE mechanical model of the FAST structures and the mechanicalresponse of the FW and VV design for the analyzed VDE event was assessed.The results indicate that design criteria are not fully satisfied by the current drawing of the VV and FWcomponents.The most critical regions have been individuated and the effect of some geometrical and materialchanges has been checked in order to improve the structure