Muon cooling methods 1keV range Methods capable of muon cooling below keV within the lifetime of 2.2us: Relatively efficient,problems with muonium 1keV Frictional cooling in gasses formation,loss LE muons in extraction from gas cell Uses layer of solid rare gas as a moderator for controlled slowing down emission process. Ideal are perfect insulators with wide band-gap 10eV Cold moderator method (epithermal muons) energy (11-22 eV) Good quality beam with small emittance BUT: Laser ionization of Only pulsed operation<30 Hz rep <leV muonium complex laser required (ultraslow muons) Muon cooling methods < 1keV range Methods capable of muon cooling below keV within the lifetime of 2.2 ms: 1 keV Frictional cooling in gasses m + m - Relatively efficient , problems with muonium formation, loss LE muons in extraction from gas cell 10 eV Cold moderator method (epithermal muons) m + Uses layer of solid rare gas as a moderator for controlled slowing down emission process. Ideal are perfect insulators with wide band-gap energy (11-22 eV) <1 eV Laser ionization of muonium (ultraslow muons) m + Good quality beam with small emittance BUT: Only pulsed operation < 30 Hz rep & complex laser required