Abstract
In the context of tokamak reactors, the Poloidal Field Coils (PFCs) are magnets that surround the Toroidal Field Coil (TFC) assembly and generate a magnetic field which equilibrates the plasma and shapes it into prescribed forms. To enforce plasma requirements, the six PFCs of the Divertor Tokamak Test (DTT), have been designed to reach a self-field as high as 9 T, and in operation will withstand electromagnetic loads of several tens of MN. From a mechanical point of view the PFCs are highly inter-connected components, whose structural response is influenced by their own loading conditions as well as by the TFC system they are installed onto. As the PFCs experience high time-varying vertical forces that would tend to separate the coils from the TFCs, a challenging task is attaining a robust design of their support structures. This work discusses some of the main design choices that have been made for the PF coil system of DTT, illustrating the in-operation behaviour and interaction among the TF coils, the PF supports and the PF magnets. Finite Element Analysis has been the principal, but not exclusive, means of investigation.
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