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Recent discovery of a Higgs boson boosted interest in a low-energymedium-luminosity Muon Collider as a Higgs Factory (HF). A preliminary designof the HF storage ring (SR) is based on cos-theta Nb3Sn superconducting (SC)magnets with the coil inner diameter ranging from 50 cm in the interactionregion to 16 cm in the arc. The coil cross-sections were chosen based on theoperation margin, field quality and quench protection considerations to providean adequate space for the beam pipe, helium channel and inner absorber (liner).With the 62.5-GeV muon energy and 2 x 10^12 muons per bunch, the electrons frommuon decays deposit about 300 kW in the SC magnets, or unprecedented 1 kW/mdynamic heat load, which corresponds to a multi-MW room temperature equivalent.Based on the detailed MARS15 model built and intense simulations, asophisticated protection system was designed for the entire SR to bring thepeak power density in the SC coils safely below the quench limit and reduce thedynamic heat load to the cold mass by a factor of 100. The system consists oftight tungsten masks in the magnet interconnect regions and elliptical tungstenliners optimized for each magnet.

Mitigating Radiation Impact on Superconducting Magnets of the Higgs Factory Muon Collider