Muon colliders: status of R&D and future plans

Abstract

The case for a future high-energy collider based on muon beams is reviewed briefly. 1 THE Y2K PROBLEM FOR PARTICLE PHYSICS Can elementary particle physics prosper for a 2nd century with laboratory experiments based on innovative particle sources? Can a full range of new phenomena be investigated? – Neutrino mass) a 2nd 3 3 mixing matrix. – Precision studies of Higgs bosons. – A rich supersymmetric sector (with manifestations of higher dimensions). – ... And more ... Will our investment in future accelerators result in more cost-effective technology, capable of extension to 10’s of TeV of constituent CoM energy? Many of us believe that a Muon Collider [1, 2, 3, 4, 5, 6] is the best answer to the above. 2 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 10 by ionization cooling [7, 8]. The cooled muons are accelerated and then stored in a ring [9, 10]. + collisions are observed over the useful muon life of 1000 turns at any energy. Intense neutrino beams and spallation neutron beams are available as byproducts. Muons decay: ! e ) Cool muons quickly (stochastic cooling won’t do). Detector backgrounds at LHC level. Potential personnel hazard from interactions. mcdonald@puphep.princeton.edu, http://puhep1.princeton.edu/mumu/ y http://www.cap.bnl.gov/mumu/mu home page.html Table 1: Baseline parameters for muon colliders at 3 TeV, 400 GeV (top factory) and 100 GeV (light Higgs factory). CoM energy (TeV) 3 0.4 0.1 p energy (GeV) 16 16 16 p’s/bunch 2.5e13 2.5e13 5e13 Bunches/fill 4 4 2 Rep. rate (Hz) 15 15 15 p power (MW) 4 4 4 /bunch 2e12 2e12 4e12 power (MW) 28 4 1 Wall power (MW) 204 120 81 Collider circum. (m) 600