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Physics Opportunities at a Muon Collider



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Princeton 99 18 Jan 7 1999 Physics Opportunities at a Muon Collider Kirk T McDonald Joseph Henry Laboratories Princeton University Princeton NJ 08544 The case for a future high energy collider based on muon beams is briefly reviewed 1 I Want to Believe That elementary particle physics will prosper for a 2nd century with laboratory experiments based on innovative particle sources That a full range of new phenomena will be investigated mass a 2nd 3 3 or larger mixing matrix Precision studies of Higgs bosons A rich supersymmetric sector And more That our investment in future accelerators will result in more cost e ective technology capable of extension to 10 s of TeV of constituent CoM energy That a Muon Collider 1 2 based on ionization cooling is the best option to accomplish the above 2 Ionization Cooling An Idea So Simple It Might Just Work Ionization takes momentum away RF acceleration puts momentum back along z axis Transverse cooling Particles are slowed along their path dE dx Particles are accelerated longitudinally 1 Origin G K O Neill 1956 3 This won t work for electrons or protons So use muons Balbekov 4 Budker 5 Skrinsky 6 late 1960 s 3 The Details are Delicate Use channel of LH2 absorbers rf cavities and alternating solenoids to avoid buildup of angular momentum One cell of the cooling channel But the energy spread rises due to straggling Must exchange longitudinal and transverse emittance frequently to avoid beam loss due to bunch spreading Can reduce energy spread by a wedge absorber at a momentum dispersion point Absorber wedge Energy too high Nominal energy Equal energies Energy too low 6 D emittance constant at best in this process 4 What is a Muon Collider An accelerator complex in which Muons both and are collected from pion decay following a pN interaction Muon phase volume is reduced by 106 by ionization cooling 2 The cooled muons are accelerated and then stored in a ring collisions are observed over the useful muon life of 1000 turns at any energy



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