Electromagnetic and mechanical analysis of a toroidal field coil winding pack for EU DEMO

As a part of European Union (EU) DEMO studies, the result of the so-called PROCESS system code has been taken as the basis to design a toroidal field coil (TFC) winding pack with high temperature superconductors (HTS). Rare-Earth-barium-copper-oxide (REBCO) coated superconductor is a promising candidate for high magnetic field applications. This paper gives an overview of the studies performed and results obtained of the mechanical design calculations of a TFC conductor and its winding pack. With this model the in-plane Lorentz forces on the conductors have been calculated by making a 3-D electromagnetic analysis with EFFI codes. To obtain information about the stresses in the stainless steel jacket and turn insulation, a detailed model of the TFC inboard leg cross section has been developed and analyzed.