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Description
DTT (Divertor Tokamak Test) is a fusion reactor facility which is being built in the Research Centre of ENEA Frascati, to cope with the technological challenges related to the divertor system in DEMO. The magnetic system includes 18 toroidal field (TF), a central solenoid (CS) composed by 6 modules and 6 poloidal field (PF) coils. These last are solenoids based on Nb3Sn for the 2 more performing polar magnets, PF1 and PF6 (Bmax 9T, Imax=28.3kA), and on NbTi for the other 4 larger PF2 to PF5 coils (Bmax 5.3T, Imax=28.6kA). In this paper, the requirements for the operation of these coils in DTT leading to the final design and the main qualification tests are summarized. The procurement phase of the PF magnet system is also illustrated in the present work, along with the definition of possible experimental assessment of the insulation performances in relevant condition by ad-hoc manufactured mock-ups of the PFs winding pack.
