integrated mc detector design mary anne cummings stephen kahn muons, inc

04/24/2304/24/23 M A Cummings Integrated MC DetectorsM A Cummings Integrated MC Detectors

Integrated MC Detector DesignIntegrated MC Detector Design

Mary Anne CummingsStephen Kahn

Muons, Inc. (http://www.muonsinc.com/)

December 3, 2009MCDW09

Brookhaven •

Muons, Inc.

11

http://www.muonsinc.com/

MC Physics MC Physics From J. Lykken’s talk, MCW FNAL:From J. Lykken’s talk, MCW FNAL:

Four ways to produce new physics:Four ways to produce new physics:specific to MC…specific to MC…• Virtual effects on SM processes Virtual effects on SM processes

same as or worse than ILC, CLICsame as or worse than ILC, CLIC• s-channel resonant production of new heavy particless-channel resonant production of new heavy particles

MC has unique advantages (e.g., AMC has unique advantages (e.g., A00 & H & H00 separation, Z’ or M-brane…) separation, Z’ or M-brane…)• pair production of new heavy particles (also some associated production like Zh)pair production of new heavy particles (also some associated production like Zh)

same as CLIC, except for threshold energy scanssame as CLIC, except for threshold energy scans• vector boson fusion t-channel resonant productionvector boson fusion t-channel resonant production

same as or worse than CLICsame as or worse than CLIC

04/24/2304/24/23 M A Cummings Integrated MC DetectorsM A Cummings Integrated MC Detectors 22

“Figure out more generically what a MC can do..”

MC Physics: the basics -

Integration Studies for MC DetectorIntegration Studies for MC Detector


““Backgrounds, backgrounds, backgrounds”Backgrounds, backgrounds, backgrounds” - Marcel Demarteau, MCW FNAL November- Marcel Demarteau, MCW FNAL November

Backgrounds in MC:Backgrounds in MC:• Almost exclusively from muon decays in the latticeAlmost exclusively from muon decays in the lattice• Electron decays:Electron decays:

for 0.75-1 TeV muons is λfor 0.75-1 TeV muons is λD D = 4X10= 4X1066 m m 1.28X101.28X101010 decays per meter per second for 2 muon (2X10 decays per meter per second for 2 muon (2X101212) bunches) bunches

• Electron mean energy ~ 1/3 muon, ~250 GeV synchrontron radiateElectron mean energy ~ 1/3 muon, ~250 GeV synchrontron radiate• Showers induced by electrons and photons inside the collider ring components Showers induced by electrons and photons inside the collider ring components

generate intense fluxes of muons, hadrons and daughter electrons and photonsgenerate intense fluxes of muons, hadrons and daughter electrons and photons

Backgrounds at IP into MC Detector:Backgrounds at IP into MC Detector:• Specific background particle fluences will drive the detector designSpecific background particle fluences will drive the detector design• 1996 parameters need to be revised in light of new detector and readout 1996 parameters need to be revised in light of new detector and readout

technologiestechnologies Detector and IR designs are interdependentDetector and IR designs are interdependent

Detector from 1996Detector from 1996

Last 130 m of beam delivery system (BDS):Last 130 m of beam delivery system (BDS): Four quadrupoles: final focus for the Four quadrupoles: final focus for the

intersection regionintersection region One 8T dipole used as scraperOne 8T dipole used as scraper 2T detector solenoid2T detector solenoid 2 bunches with 2.102 bunches with 2.101212muons/bunch, bunch muons/bunch, bunch

length (width) 3mm (3μm)length (width) 3mm (3μm) L=10L=103535cm-2s-1, 2x2 TeVcm-2s-1, 2x2 TeV


From 1996 Snowmass study

Sophisticated shielding against Sophisticated shielding against decay electronsdecay electronsTungsten shielding taking up Tungsten shielding taking up 20 degree cone20 degree cone

Recent Background StudiesRecent Background Studies N. Molkov, MCW, FNAL:N. Molkov, MCW, FNAL:


Neutron (above), photon and electron (right) fluences

Detector DevelopmentsDetector Developments


The detectors proposed for lepton colliders are real precision The detectors proposed for lepton colliders are real precision detectorsdetectors• Identify each and every particle, with high efficiency and high purity, Identify each and every particle, with high efficiency and high purity,

over the full angular rangeover the full angular range Differentiate between Z’s and W’s in their hadronic decayDifferentiate between Z’s and W’s in their hadronic decay Differentiate between b-and c-quarksDifferentiate between b-and c-quarks Differentiate between b-and anti-b quarkDifferentiate between b-and anti-b quark

• Superb calorimetry lies at the heart of lepton collider detectors, partly Superb calorimetry lies at the heart of lepton collider detectors, partly because of the very small cross sections because of the very small cross sections

Jet energy resolution ~ 3-4%Jet energy resolution ~ 3-4% PFA – substract out charged particles with ECAL, tracking, and PFA – substract out charged particles with ECAL, tracking, and

measure neutrals with HCALmeasure neutrals with HCAL Dual Readout CalorimetryDual Readout Calorimetry Total Absorption CalorimetryTotal Absorption Calorimetry

Large-scale, fast timing technologiesLarge-scale, fast timing technologies Will need to evaluate these for MCsWill need to evaluate these for MCs

Instrumented ConeInstrumented Cone

• High precision, fast readout High precision, fast readout • High radiation environment High radiation environment

Lumi-Cal (40-140 mrad)Lumi-Cal (40-140 mrad)• Precise measurement of the Precise measurement of the

integrated luminosity (ΔL/L ~ 10-3) integrated luminosity (ΔL/L ~ 10-3) using Bhabha’susing Bhabha’s

• Veto for 2-γ processes Veto for 2-γ processes

Beam-Cal (5-40 mrad)Beam-Cal (5-40 mrad)• Beam diagnostics using Beam diagnostics using

beamstrahlung pairsbeamstrahlung pairs• Provide 2-γprocess vetoProvide 2-γprocess veto

Gam-Cal (< 5mrad)Gam-Cal (< 5mrad)• Beam diagnostics using Beam diagnostics using

beamstrahlung photonsbeamstrahlung photons


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

Collider DevelopmentsCollider Developments Specifications for e+e-colliders have been Specifications for e+e-colliders have been

clearly formulated over the course of the clearly formulated over the course of the last years for:last years for:• Collider parameters:Collider parameters:

Energy, Luminosity, Polarization, Final Focus, Beam Delivery, Energy, Luminosity, Polarization, Final Focus, Beam Delivery, Train Structure, Repetition Rate, Bunch Structure, Train Structure, Repetition Rate, Bunch Structure,

• Measurement of collider parameters:Measurement of collider parameters: Energy, Luminosity, Luminosity Profile, PolarizationEnergy, Luminosity, Luminosity Profile, Polarization

• Collider detectorsCollider detectors Resolutions, coverage, readout…Resolutions, coverage, readout…

More than a decade of detector R&D has More than a decade of detector R&D has occurred, in large part driven by the ILC occurred, in large part driven by the ILC project, to meet these specifications project, to meet these specifications

A benchmark for physics processes now A benchmark for physics processes now existsexists

The CERN Linear Collider Physics and The CERN Linear Collider Physics and Detector project has called for a 4-volume Detector project has called for a 4-volume Conceptual Design Report (CDR) by the Conceptual Design Report (CDR) by the end of 2010end of 2010


useful reference for μC physics

Two studies toward integrated designTwo studies toward integrated design

04/24/2304/24/23 M A Cummings Integrated MC DetectorsM A Cummings Integrated MC Detectors

Muons, Inc. SBIR proposals: Particle occupancy in detectors

Backgrounds from MC lattice

Both proposals rely on G4Beamline’s ability to combine beamline componentsand particle tracks through matter – simple enough for repeated iterations for optimization studies..

Some stated SBIR Milestones..Some stated SBIR Milestones..MC Background Studies –MC Background Studies – Formulate and develop a Monte Carlo program to simulate muon accelerator based backgrounds.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.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. Use the background simulation program to study the shielding for a muon collider detector.

Calculate the fluxes that get into the detector region.Calculate the fluxes that get into the detector region.

Integrated MC Detector Studies –Integrated MC Detector Studies – G4Beamline simulates beam-induced backgrounds in a simple sensor array of a large detector in G4Beamline simulates beam-induced backgrounds in a simple sensor array of a large detector in

the low-beta region of a muon collider.the low-beta region of a muon collider. Rates and distributions of muon decay products in proto-detectors for a more complete MC 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.simulation in G4Beamline Occupancy per unit volume of various particle backgrounds detailed. Conceptual design of a calorimeter to be simulatedConceptual design of a calorimeter to be simulated G4beamline simulations compared to MARS and to analytic calculations. Discrepancies G4beamline simulations compared to MARS and to analytic calculations. Discrepancies

understood.understood.


May have to change assumptions: Asymmetric IRMay have to change assumptions: Asymmetric IR C. Johnstone:C. Johnstone:Initial IR design has begun on an asymmetric low beta IR Initial IR design has begun on an asymmetric low beta IR

- open midplane magnet design is more feasible with small - open midplane magnet design is more feasible with small vertical apertures vertical apertures

Advantage includes reduced nonlinear dynamics and error and fringe field impactAdvantage includes reduced nonlinear dynamics and error and fringe field impact Disadvantage is a factor of 2 decrease in luminosity relative to the round-beam IRDisadvantage is a factor of 2 decrease in luminosity relative to the round-beam 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

04/24/2304/24/23 1111M A Cummings Integrated MC DetectorsM A Cummings Integrated MC Detectors

Work…Work… sLHC/MC complementarity study, analogous to the 2004 sLHC/MC complementarity study, analogous to the 2004

LHC/ILC complementarity studyLHC/ILC complementarity study

MC vs CLIC study, with some reasonable ground rulesMC vs CLIC study, with some reasonable ground rules

““Physics at a 3-4 TeV Muon Collider” (previous comprehensive Physics at a 3-4 TeV Muon Collider” (previous comprehensive studies focused on the “FMC”, a <=500 GeV machine)studies focused on the “FMC”, a <=500 GeV machine)

Most previous studies of individual channels used the old Most previous studies of individual channels used the old fashioned “make some simple cuts” or “make the simplest fashioned “make some simple cuts” or “make the simplest observable” strategy; need to be re-done using all the observable” strategy; need to be re-done using all the information in the events, i.e. complete background information in the events, i.e. complete background informationinformation..


integrated mc detector design mary anne cummings stephen kahn muons, inc

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