Muon transport channels with longitudinal magnetic field

As part of Fermilab Neutrino Factory study, a preliminary analysis has been made to realize the feasibility and complexity of the magnetic systems for the drift channel, phase rotation channel, and cooling channel. For each channel, a simple optimization was made with the goal of reducing its cost. Although design and implementation of every channel discussed above is a nonstandard technical task, one can expect to meet the most challenging problems working with the cooling channel. Both radial and axial ponderomotive forces in this channel are extremely large as well as the interacting forces acting on the first and the last magnets in the string. Because the mechanical behavior of a magnet in this channel is the main issue to study, thorough modeling of the system is a must in this case. Other objects of study are optimization of the quench protection system and analysis of stresses in coils during cooling down and warming up. Undoubtedly, modeling and prototyping of the channel magnets must accompany development of magnetic systems for the Neutrino Factory front end.