Speaker
Description
Muons produced through pion decay have high emittances, occupying a large volume in phase space. Hence, cooling is required to reduce the muon phase space density before acceleration. Traditional cooling schemes are too slow to be practical for muon beams. A novel technique proposed for muon colliders, ionization cooling, is instead considered. Muons are passed through absorbers, where they lose energy via ionization. RF cavities are used to restore longitudinal momentum, and the beam is focused by a solenoidal lattice. Cooling is carried out in two stages: initial (6D) and final (4D). One proposed scheme for initial 6D cooling is the helical FOFO snake, which incorporates wedge absorbers, and allows simultaneous cooling of both muons and antimuons. One challenge associated with this channel is a larger sensitivity to beam mismatch. A unique initial phase space shape is required to permit the design helical trajectory and avoid losses in energy and luminosity. A solenoidal beam matching strategy for the HFOFO channel is presented.
