ИСТИНА

For the Future Circular Collider (FCC) presently under conceptual design at CERN, very large size conductors are needed for the detector magnets. The requested critical current is an order of magnitude higher than of the previous generation, corresponding to some 200 to 300 kA at 4.2 K and 5 T. Characteristic conductor layouts, in particular regarding the type and fraction of structural materials, are reviewed in order to extrapolate to the most promising designs and adapt those to the requirements imposed for the FCC detector magnets. Nominal currents required at characteristic operating conditions of 6.5 T and 4.6 K, conductor dimensions, production unit lengths and mass are investigated for defining the design of the conductor. For comparing various conductor layout options, and as a first step in the conductor R&D, it is proposed to study the feasibility of the conductor fabrication, conductor sizing, coil winding needs and determine relevant material characteristics.