Electron-Muon Ranger (EMR) Ruslan Asfandiyarov MICE Video Conference April 11, 2013
Construction Construction quarter of the detector completed (12 planes) every plane tested (LED / Camera / image analysis) fiber bundles are being produced (this is the longest step) three first planes are used for cosmic test bench Ruslan Asfandiyarov, Electron-Muon Ranger (EMR) MICE Video Conference, April 11, 2013
Construction full electronics chain is being tested configuration board (VCB) + FEB read-out board (VRB) + DBB (64-ch. PMT) flash ADC (1-ch. PMT) cosmic trigger is generated by coincidence of two planes middle one is readout at both ends Ruslan Asfandiyarov, Electron-Muon Ranger (EMR) MICE Video Conference, April 11, 2013
EMR Scheme
Ionization 1 Geant4 E Scintillation 2 n 1 = E α 3 P(µ = n 1 ) n 2 Trapping 4 n 3 = n 2 β 5 P(µ = n 3 ) n 4 Attenuation and loss in fiber 6 n 5 = n 4 γ δ 7 P(µ = n 5 ) n 6 PMT response and anode non-uniformity 8 n 7 = n 6 ε η 9 P(µ = n 7 ) n 8 response 10 n 9 = n 8 τ 11 G(µ = n 8, σ = ) n 9 E [MeV] - deposited energy α [1/MeV] - number of photons per MeV n 1 - number of photons from scintillation n 2 - randomly sampled n 1 according to Poisson P(µ = n x ) - Poisson distribution β - trapping efficiency n 3 - number of photons trapped by fibre n 4 - randomly sampled n 3 according to Poisson γ - fiber attenuation factor δ - connector loss factor n 5 - number of photons which reach PMT n 6 - randomly sampled n 5 according to Poisson ε - quantum efficiency of PMT η - PMT anode non-uniformity n 7 - number of photoelectrons n 8 - randomly sampled n 7 according to Poisson τ - number of ADC counts per photoelectron n 9 - number of ADC counts G(µ = n x, σ = ) - Gaussian distribution α, β, γ, δ, η, τ and can be measured experimentally all parameter are used in simulation parameters are used in the simulation
: Example parameters: Construction number of scintillation photons per MeV: 8000 trapping efficiency: 0.002 PMT photocathode quantum efficiency: 0.2 number of ADC counts per photo-electron: 8 spread of PMT response in ADC: 10 Energy deposition (MeV) Digitized signal (ADC counts)
: Comparison with Cosmics Simulation (3 GeV, µ ) Real data (cosmic) Relatively good agreement between simulation and data digitization parameters has to be measured experimentally
Fibers, Bars, Planes Localization
Light Loss Non-Uniformity in Connectors light loss in connectors exhibit non-uniform behaviour this is measured using LED-Camera test system light loss for every individual bar is measured and used in digitization
Light Loss Non-Uniformity in Connectors Energy Deposition per Plane, 200 mev/c muons Energy deposition (MeV) Digitized signal (ADC counts) this can be corrected offline
Energy Localization 200 MeV/c muons Construction energy depositions of hits within 10 ns are more localized this will improve precision
Rejection of Decay Electrons Total Energy (in MeV) in Full Detector for 200 MeV/c muons All hits (MeV) Hits within first 10 ns (MeV) Resolution = 8.8% Resolution = 3.5%
Rejection of Decay Electrons Total Energy (in ADC) in Full Detector for 200 MeV/c muons All hits (ADC) Hits within first 10 ns (ADC) Resolution = 10.99% Resolution = 8.15%
Summary Summary Current Status 12 planes done / construction ongoing full electronics chain is being tested simulation implemented (preliminary version in MAUS) digitization developed (not in MAUS yet) analysis has been started