The conceptual design study of a hadron Future Circular Collider (FCC-hh)with a center-of-mass energy of the order of 100 TeV in a new tunnel of 80-100km circumference assumes the determination of the basic requirements for itsdetectors. A superconducting solenoid magnet of 12 m diameter inner bore withthe central magnetic flux density of 6 T is proposed for a FCC-hh experimentalsetup. The coil of 24.518 m long has seven 3.5 m long modules included into onecryostat. The steel yoke with a mass of 21 kt consists of two barrel layers of0.5 m radial thickness, and 0.7 m thick nose disk, four 0.6 m thick end-capdisks, and three 0.8 m thick muon toroid disks each side. The outer diameter ofthe yoke is 17.7 m; the length without the forward muon toroids is 33 m. Theair gaps between the end-cap disks provide the installation of the muonchambers up to the pseudorapidity of \pm 3.5. The conventional forward muonspectrometer provides the measuring of the muon momenta in the pseudorapidityregion from \pm 2.7 to \pm 4.6. The magnet modeled with Cobham's program TOSCA.The total Ampere-turns in the superconducting solenoid coil are 127.25MA-turns. The stored energy is 43.3 GJ. The axial force onto each end-cap is480 MN. The stray field at the radius of 50 m off the coil axis is 14.1 mT and5.4 mT at the radius of 100 m. All other parameters presented and discussed.
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