FAST (Fusion Advanced Studies Torus) is a proposal for a Satellite Facility which can contribute the rapid exploitation of ITER and prepare ITER and DEMO regimes of operation, as well as exploit innovative plasma facing component systems for DEMO. FAST is a compact (Ro=1.82m, a=0.64m, triangularity δ=0.4) and cost effective machine able to investigate, with integration capability, non linear dynamics effects of alpha particle behaviour in burning plasmas. FAST operates in high performance H-mode (B T up to 8.5T; I P up to 8MA), as well as in advanced tokamak mode (I P =3MA), and in full non inductive current mode (I P =2MA). Helium gas at 30K is used for cooling the resistive copper magnets. This allows for a pulse duration up to 170s at 3MA/3.5T. The vacuum vessel (VV), segmented into 20-degree modules, is capable to accommodate a 40MW RF power system. The machine has been designed to house a 10MW Negative Neutral Beam Injection (NNBI) system. Tungsten (W) or liquid lithium (L-Li) have been chosen as the divertor plate materials, and argon or neon as the impurities to be injected for mitigating the thermal loads.