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FAST (Fusion Advanced Studies Torus), the Italian proposal of a SatelliteFacility to ITER, is a compact tokamak (R$_0$ = 1.82 m, a = 0.64 m,triangularity $\delta$ = 0.4) able to investigate non-linear dynamics effectsof $\alpha$-particle behavior in burning plasmas and to test technicalsolutions for the first wall/divertor directly relevant for ITER and DEMO.Currently, ENEA is investigating the feasibility of a superconducting solutionfor the magnet system. This paper focuses on the analysis of the CS (CentralSolenoid) magnet thermal behavior. In particular, considering a superconductingsolution for the CS which uses the room available in the resistive design andreferring to one of the most severe scenario envisaged for FAST, the heat loadof the CS winding pack due to AC losses is preliminarily evaluated. The resultsprovide a tentative baseline for the definition of the strand requirements andconductor design, that can be accepted in order to fulfil the designrequirements.

The superconducting proposal for the CS magnet system of FAST: a preliminary analysis of the heat load due to AC losses