  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 80-100
km circumference assumes the determination of the basic requirements for its
detectors. A superconducting solenoid magnet of 12 m diameter inner bore with
the central magnetic flux density of 6 T is proposed for a FCC-hh experimental
setup. The coil of 24.518 m long has seven 3.5 m long modules included into one
cryostat. The steel yoke with a mass of 21 kt consists of two barrel layers of
0.5 m radial thickness, and 0.7 m thick nose disk, four 0.6 m thick end-cap
disks, and three 0.8 m thick muon toroid disks each side. The outer diameter of
the yoke is 17.7 m; the length without the forward muon toroids is 33 m. The
air gaps between the end-cap disks provide the installation of the muon
chambers up to the pseudorapidity of \pm 3.5. The conventional forward muon
spectrometer provides the measuring of the muon momenta in the pseudorapidity
region 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 127.25
MA-turns. The stored energy is 43.3 GJ. The axial force onto each end-cap is
480 MN. The stray field at the radius of 50 m off the coil axis is 14.1 mT and
5.4 mT at the radius of 100 m. All other parameters presented and discussed.
