30 T on Target Neutrino Factory / Muon Collider Front - End

A novel aspect of this design comes from using the windows on the rf cavity as the cooling absorbers. This is possible because the near constant β function does not significantly increase the emittance heating at the window location. The window consists of a 1 cm thickness of LiH with a 75μm layer of Be on the rf cavity field side and, 25μm layer of Be on the opposite side. (The Be will, in turn, have a thin coating of TiN to prevent multipactoring). The alternating 2.8 T solenoidal field is produced with one solenoid per half cell, located between the rf cavities.