Integrated MC Detector Design Mary Anne Cummings Stephen Kahn Muons, Inc .

1. Muons, Inc. m • Integrated MC Detector Design • Mary Anne Cummings • Stephen Kahn • Muons, Inc. • (http://www.muonsinc.com/) • December 3, 2009 • MCDW09 • Brookhaven M A Cummings Integrated MC Detectors

2. MC Physics MC Physics: the basics - “Figure out more generically what a MC can do..” • From J. Lykken’s talk, MCW FNAL: • Four ways to produce new physics: specific to MC… • Virtual effects on SM processes • same as or worse than ILC, CLIC • s-channel resonant production of new heavy particles • MC has unique advantages (e.g., A0 & H0 separation, Z’ or M-brane…) • pair production of new heavy particles (also some associated production like Zh) • same as CLIC, except for threshold energy scans • vector boson fusion t-channel resonant production • same as or worse than CLIC M A Cummings Integrated MC Detectors

3. Integration Studies for MC Detector • “Backgrounds, backgrounds, backgrounds” - Marcel Demarteau, MCW FNAL November • Backgrounds in MC: • Almost exclusively from muon decays in the lattice • Electron decays: • for 0.75-1 TeV muons is λD = 4X106 m • 1.28X1010 decays per meter per second for 2 muon (2X1012) bunches • Electron mean energy ~ 1/3 muon, ~250 GeV synchrontron radiate • Showers induced by electrons and photons inside the collider ring components generate intense fluxes of muons, hadrons and daughter electrons and photons • Backgrounds at IP into MC Detector: • Specific background particle fluences will drive the detector design • 1996 parameters need to be revised in light of new detector and readout technologies • Detector and IR designs are interdependent M A Cummings Integrated MC Detectors

4. Detector from 1996 From 1996 Snowmass study Sophisticated shielding against decay electrons Tungsten shielding taking up 20 degree cone Last 130 m of beam delivery system (BDS): Four quadrupoles: final focus for the intersection region One 8T dipole used as scraper 2T detector solenoid 2 bunches with 2.1012muons/bunch, bunch length (width) 3mm (3μm) L=1035cm-2s-1, 2x2 TeV M A Cummings Integrated MC Detectors

5. Recent Background Studies Neutron (above), photon and electron (right) fluences N. Molkov, MCW, FNAL: M A Cummings Integrated MC Detectors

6. Detector Developments • The detectors proposed for lepton colliders are real precision detectors • Identify each and every particle, with high efficiency and high purity, over the full angular range • Differentiate between Z’s and W’s in their hadronic decay • Differentiate between b-and c-quarks • Differentiate between b-and anti-b quark • Superb calorimetry lies at the heart of lepton collider detectors, partly because of the very small cross sections • Jet energy resolution ~ 3-4% • PFA – substract out charged particles with ECAL, tracking, and measure neutrals with HCAL • Dual Readout Calorimetry • Total Absorption Calorimetry • Large-scale, fast timing technologies • Will need to evaluate these for MCs M A Cummings Integrated MC Detectors

7. Instrumented Cone At e+e-machines the forward region is fully instrumented with calorimetry Physics signal: e.g. SUSY smuon production Background signal: 2-photon event, may fake the above signal if the electron is not detected • High precision, fast readout • High radiation environment • Lumi-Cal (40-140 mrad) • Precise measurement of the integrated luminosity (ΔL/L ~ 10-3) using Bhabha’s • Veto for 2-γ processes • Beam-Cal (5-40 mrad) • Beam diagnostics using beamstrahlung pairs • Provide 2-γprocess veto • Gam-Cal (< 5mrad) • Beam diagnostics using beamstrahlung photons M A Cummings Integrated MC Detectors

8. Collider Developments useful reference for μC physics • Specifications for e+e-colliders have been clearly formulated over the course of the last years for: • Collider parameters: • Energy, Luminosity, Polarization, Final Focus, Beam Delivery, Train Structure, Repetition Rate, Bunch Structure, • Measurement of collider parameters: • Energy, Luminosity, Luminosity Profile, Polarization • Collider detectors • Resolutions, coverage, readout… • More than a decade of detector R&D has occurred, in large part driven by the ILC project, to meet these specifications • A benchmark for physics processes now exists • The CERN Linear Collider Physics and Detector project has called for a 4-volume Conceptual Design Report (CDR) by the end of 2010 M A Cummings Integrated MC Detectors

9. Two studies toward integrated design Muons, Inc. SBIR proposals: Particle occupancy in detectors Backgrounds from MC lattice Both proposals rely on G4Beamline’s ability to combine beamline components and particle tracks through matter – simple enough for repeated iterations for optimization studies.. M A Cummings Integrated MC Detectors

10. Some stated SBIR Milestones.. MC Background Studies – Formulate and develop a Monte Carlo program to simulate muon accelerator based backgrounds. Verification of the Monte Carlo program by comparing it to another Monte Carlo program. Use the background simulation program to study the shielding for a muon collider detector. Calculate the fluxes that get into the detector region. Integrated MC Detector Studies – G4Beamline simulates beam-induced backgrounds in a simple sensor array of a large detector in the low-beta region of a muon collider. Rates and distributions of muon decay products in proto-detectors for a more complete MC simulation in G4Beamline Occupancy per unit volume of various particle backgrounds detailed. Conceptual design of a calorimeter to be simulated G4beamline simulations compared to MARS and to analytic calculations. Discrepancies understood. M A Cummings Integrated MC Detectors

11. May have to change assumptions: Asymmetric IR • A combined-function magnet was introduced as the first element to provide not only additional vertical focusing and aperture reduction, but also to provide background sweeping and dispersion for the IR quadrupoles • The vertical aperture in this design is reduced from 20 mm to a 4 mm maximum in the IR quadrupoles mitigating the support issues C. Johnstone: Initial IR design has begun on an asymmetric low beta IR - open midplane magnet design is more feasible with small vertical apertures Advantage includes reduced nonlinear dynamics and error and fringe field impact Disadvantage is a factor of 2 decrease in luminosity relative to the round-beam IR M A Cummings Integrated MC Detectors

12. Work… sLHC/MC complementarity study, analogous to the 2004 LHC/ILC complementarity study MC vs CLIC study, with some reasonable ground rules “Physics at a 3-4 TeV Muon Collider” (previous comprehensive studies focused on the “FMC”, a <=500 GeV machine) Most previous studies of individual channels used the old fashioned “make some simple cuts” or “make the simplest observable” strategy; need to be re-done using all the information in the events, i.e. complete background information. M A Cummings Integrated MC Detectors