MINERvA Simulation-HCAL and ECAL Calorimetry
Jaewon ParkUniversity of Rochester
MINERvA Collaboration Meeting, Sep 29, 2006
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Energy Loss Calculation
scintscintmin
scintscintminiron
ironminscint
losstotalloss )(
)()(L
LLEEdxdE
dxdE
dxdE
scintLironL
particleiron scint
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Detector Logical Region
Scint onlyECALHCALNucl. target
0θ
40θ80θ
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
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Theta dependence
2.2GeV proton beam is used Need to calibrate (or correct leakage) to make mean shift flat
measured11
true
11
mean
truemeasured
t
tm)(
EE
EE
EEE
EE
ΔE/E mean) (ΔE/E
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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 complicat
ed
scintscintminID )(55.1 LE dx
dE
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Infinite OD
With infinite OD, there will be no leakage to OD
Original OD + 5cm x 19 layers
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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.
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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 f
act total energy should be constant
ODDSIDTotal aEEEE a=1.3 seems best value
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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
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Slot optimization
45.7411.4312.1559.777.3855v4
45.7511.4311.437.637.637.63v3
45.735.7211.4311.4311.435.72v2
45.7311.4311.4311.435.725.72v1
45.7417.1511.435.725.725.72orig OD v2 is not practical Too thin most outer layer
OD v4 would be best
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ECAL -Overview Preliminary ECAH study
Electron beam is used. (Previous HCAL study uses proton beam) Looked at Energy dependence, Vertex Z dependence, theta de
pendence 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 re
solution than 1.75 2.5/1.75=1.43
)EEE(E HCALECALID cba
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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
E/E/E)( ba
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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 resoluti
on twice
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Thicker ECAL
4mm lead gives ~20% decrease on resolution 3mm lead gives ~10% decrease on resolution