Superconducting solenoids for the muon collider

The muon collider, is a new idea for lepton colliders. The ultimate energy of an electron ring is limited by synchrotron radiation, Muons, which have a rest mass that is 200 times that of an electron can be stored at much hig her before synchrotron performance. The problem with muons is their short l ife time (2.1 mu s at rest). In order to operate a muon storage ring large numbers of muon must be collected, cooled and accelerated before they decay to an electron and two neutrinos. As we see it now, high field superconduc ting solenoids are an integral part of a muon collider muon production and cooling systems. This report will describe the design parameters for superc onducting and hybrid solenoids that are used for pion production and collec tion, RF phase rotations of the pions as they decay into muons and the muon cooling (reduction of the muon emittance) before acceleration.