Studies of the CEA Design Proposals for EU-DEMO Magnets

The paper gives an overview of the latest magnet design activities at CEA for the EU-DEMO Magnet Systems. It explains the latest changes in design constraints, inputs and definitions, the updates that have been implemented in the design tools, and shows the latest CEA proposed design for the TF magnet. We will discuss the recent updates in the TF and PF design tools which were used in 2022 and 2023. In particular, the tools have evolved to include additional constraints or operating points like possible sub-cooling of the coils or synchronous discharge of the axisymmetric PF/CS system. The electromagnetic coupling of the TF coils with coil case and radial plates is also discussed during a fast safety discharge, along with energy extraction and deposition sharing. Furthermore, a new 2D TF mechanical model is presented that permits to make a fast iteration with design tools and optimize the radial build. Finally, the paper also includes an update on the CEA TF conductor qualification sample, describing in particular the latest results obtained in the Twente Press.