Design Issues for the Solenoid Magnets for the Neutrino Factory Muon Cooling System, LBNL-46357

The muon cooling system is the costliest part of the proposed neutrino factory. A major cost item for the cooling channel is the superconducting solenoids that surround the 200 MHz RF cavities for accelerating the muons after they have been cooled and the hydrogen absorbers that cool the muons going down the cooling channel. The size of the solenoids for the muon-cooling channel is set by the diameter of the 200 MHz RF cavities. This report discusses, in a general way, the steps needed to reduce the peak and average stresses in the solenoid and the solenoid cost. The design parameters that affect magnet training and quench protection are also discussed. This report presents the feasibility of building reduced size solenoids that will model the behavior of the full size magnets. The use of reduced scale model magnets is an attractive idea in that it would permit one to solve most of the fundamental superconducting magnet design problems at a reduced cost