ICHEP 02 Hanson 13

ICHEP Conference Amsterdam31st International Conference on High Energy Physics 24 - 31 July 2002: 

ICHEP Conference Amsterdam 31st International Conference on High Energy Physics 24 - 31 July 2002 Gail G. Hanson University of California, Riverside For The Neutrino Factory and Muon Collider Collaboration STATUS OF Randamp;D ON NEUTRINO FACTORIES AND MUON COLLIDERS

WHY MUON COLLIDERS?: 

WHY MUON COLLIDERS? Muons are fundamental particles, so same advantage as e+e- colliders:  Energy of interaction is full energy of particle, not of constituent quarks or gluons (factor ~10) Synchrotron radiation by muons is less than for electrons by factor of (me/mm)4 ≈ 6 10-10  Energy lost by synchrotron radiation must be put back by rf power (cost of power for operation)  Muon beam can have narrow energy spread (≥10-5)  High energy collider can be much smaller!

COMPARISON OF HIGH ENERGY COLLIDERS: 

COMPARISON OF HIGH ENERGY COLLIDERS

WHY MUON STORAGE RINGS?: 

WHY MUON STORAGE RINGS? Muons decay: A muon storage ring can produce 1019 to 1021 muon decays per year  The stored muons can have energy 20-50 GeV  The stored muons can be polarized  There is no comparable source of electron neutrinos and antineutrinos  Intense beams of neutrinos can be produced to study neutrino oscillations and possible CP violation  A Neutrino Factory or

NEUTRINO OSCILLATIONS: 

NEUTRINO OSCILLATIONS A neutrino factory can measure  q13 from ne  nm  The sign of Dm232 using matter effects  CP violation in the leptonic sector if sin2(2q13), sin2(2q21) and Dm221 are sufficiently large _ _

NEUTRINO FACTORY FEASIBILITY STUDIES: 

NEUTRINO FACTORY FEASIBILITY STUDIES Schematic of a Neutrino Factory - Study II Version Two detailed feasibility Studies carried out: • Feasibility Study I at Fermilab • Feasibility Study II at Brookhaven National Lab

NEUTRINO FACTORY FEASIBILITY STUDY II: Target and Capture: 

NEUTRINO FACTORY FEASIBILITY STUDY II: Target and Capture Target, capture solenoids and mercury containment 1-cm-diameter Hg jet in 2 1012 protons at t = 0, 0.75, 2, 7, 18 ms BNL Experiment E951:

NEUTRINO FACTORY FEASIBILITY STUDY II: Cooling: 

NEUTRINO FACTORY FEASIBILITY STUDY II: Cooling Simulation results: Cooling channel: solenoidal focusing (SFOFO)

WHY MUON COLLIDERS?: 

WHY MUON COLLIDERS? The Higgs boson couples to mass, so cross section at s-channel Higgs pole is very large (Fig.)  Small beam energy spread can allow measurement of mH to few hundred keV  Direct measurement of Higgs width GH to ~ 1 MeV  A Higgs Factory S-CHANNEL HIGGS PRODUCTION (From T. Han, talk at FNAL, May 22, 1998)

NEED FOR SUSY HIGGS FACTORY?: 

NEED FOR SUSY HIGGS FACTORY? Muon collider? For larger values of tan b, the heavy Higgs bosons H0, A0 may have couplings to gauge bosons suppressed. We might need a muon collider to discover them.

HIGGS FACTORY PARAMETERS: 

HIGGS FACTORY PARAMETERS

HIGH ENERGY MUON COLLIDER PARAMETERS: 

HIGH ENERGY MUON COLLIDER PARAMETERS

POSSIBLE HIGGS FACTORY SCHEMATIC: 

POSSIBLE HIGGS FACTORY SCHEMATIC Ring Cooler Higgs Factory: One of the most crucial Randamp;D issues for a muon collider is 'cooling' the muons - making the beam smaller in 6D phase space

COOLING: 

COOLING  100 cooling needed in each transverse and in longitudinal direction (~106 in 6D emittance) compared with m’s from p decay.

BALBEKOV RING COOLER: 

BALBEKOV RING COOLER

RFOFO RING COOLER: 

RFOFO RING COOLER (R. PALMER)

QUADRUPOLE RING COOLER: 

QUADRUPOLE RING COOLER (A. Garren, H. Kirk)

SUMMARY OF PROGRESS TOWARDSMUON COLLIDER COOLING: 

SUMMARY OF PROGRESS TOWARDS MUON COLLIDER COOLING Neutrino Factory feasibility study simulations show cooling to eTN = 2 pmm and eLN = 30 pmm (bunched!) Ring Cooler cools ~  5 transverse,  2 longitudinal Lithium lens (or other?) needed to cool ~  10 to sub-mm in eTN There has been a tremendous amount of progress in Randamp;D on cooling, which can be used to develop a better Neutrino Factory design!