Innovative design for FAST divertor compatible with remote handling, electromagnetic and mechanical analyses

Divertor is a crucial component in Tokamaks, aiming to exhaust the heat power and particles fluxes com-ing from the plasma during discharges. This paper focuses on the optimization process of FAST divertor,aimed at achieving required thermo-mechanical capabilities and the remote handling (RH) compati-bility. Divertor RH system final layout has been chosen between different concept solutions proposedand analyzed within the principles of Theory of Inventive Problem Solving (TRIZ). The design was aidedby kinematic simulations performed using Digital Mock-Up capabilities of Catia software. Considerableelectromagnetic (EM) analysis efforts and top-down CAD approach enabled the design of a final andconsistent concept, starting from a very first dimensioning for EM loads.In the final version here presented, the divertor cassette supports a set of tungsten (W) actively cooledtiles which compose the inner and outer vertical targets, facing the plasma and exhausting the main partof heat flux. W-tiles are assembled together considering a minimum gap tolerance (0.1–0.5 mm) to bemandatorily respected. Cooling channels have been re-dimensioned to optimize the geometry and thelayout of coolant volume inside the cassette has been modified as well to enhance the general efficiency.