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MINERvA Simulation - HCAL and ECAL Calorimetry

MINERvA Simulation - HCAL and ECAL Calorimetry. Jaewon Park University of Rochester. MINER v A Collaboration Meeting, Sep 29, 2006. iron. scint. particle. Energy Loss Calculation. Scint only. ECAL. HCAL. Nucl. target. Detector Logical Region. For HCAL study, lead can be ignored

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MINERvA Simulation - HCAL and ECAL Calorimetry

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  1. MINERvA Simulation-HCAL and ECAL Calorimetry Jaewon Park University of Rochester MINERvA Collaboration Meeting, Sep 29, 2006

  2. iron scint particle Energy Loss Calculation

  3. Scint only ECAL HCAL Nucl. target Detector Logical Region • For HCAL study, lead can be ignored • For theta=0deg, particle will hit DS-HCAL. • For theta=40deg, it passes both DS-HCAL and OD

  4. Theta dependence • 2.2GeV proton beam is used • Need to calibrate (or correct leakage) to make mean shift flat

  5. Theta dependence • HCAL=OD+DSHCAL • Like to know whether mean shift is effect of leakage or improper calibration • Event selection for avoiding MIP-like event makes theta dependence more complicated

  6. Infinite OD • With infinite OD, there will be no leakage to OD • Original OD + 5cm x 19 layers

  7. Guessing leakage from extended OD layers • Extended OD layers: 5.72cm x 3 + 11.43cm + 5cm x 19 layers • With extended OD geometry, leakage is eliminated. • Mean shift got flatter but not completely flat • New OD calibration might make mean shift flat.

  8. Relative calibration for OD layers • E id and E hcal from extended OD looks complementary shape • Leakage energy is acquired from extended layers • Relative calibration constant for OD can be estimated using the fact total energy should be constant a=1.3 seems best value

  9. OD calibration: Applying to actual geometry • Mean shift got better. Resolution increased a little bit. It’s unavoidable. Same for leakage correction • Our model for leakage correction • Simple leakage correction can be based on interaction length • Want to parametise leakage as function of interaction length

  10. orig 5.72 5.72 5.72 11.43 17.15 45.74 v1 5.72 5.72 11.43 11.43 11.43 45.73 v2 5.72 11.43 11.43 11.43 5.72 45.73 v3 7.63 7.63 7.63 11.43 11.43 45.75 v4 5 7.385 9.77 12.155 11.43 45.74 Slot optimization • OD v2 is not practical • Too thin most outer layer • OD v4 would be best

  11. ECAL -Overview • Preliminary ECAH study • Electron beam is used. (Previous HCAL study uses proton beam) • Looked at Energy dependence, Vertex Z dependence, theta dependence • Try to find calibration constant for ECAL • Here, ID means pure plastic scintillator • b and c is calculated from dE/dx weighting. (b=1.75) • After some tries, ECAL calibration factor b=2.5 gives better resolution than 1.75 • 2.5/1.75=1.43

  12. DS-ECAL Energy and Vertex Z dependence • Vz = 0cm • Theta=0deg • b=2.53 makes mean shift flat • 1GeV electron beam • Resolution is better when ID/OD is high • b=2.51 makes mean shift flat

  13. Barrel ECAL Theta dependence • E=1GeV, Vz = 0cm • Theta=0,10,…50deg • b alone can’t make mean shift flat • 2.5 times OD calibration factor seems to mean shift flat but made resolution twice

  14. Thicker ECAL • 4mm lead gives ~20% decrease on resolution • 3mm lead gives ~10% decrease on resolution

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