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FGT ND-ECAL Simulation
Soumya Ranjan Das
Department of PhysicsIndian Institute of Technology Guwahati
November 12, 2015
Soumya (IITG) ECAL Energy Resolution November 12, 2015 1 / 15
Outline
DUNE FGT Near Detector
ND-ECAL Parameters
Simulation Update
Downstream ECAL Energy Resolution
Soumya (IITG) ECAL Energy Resolution November 12, 2015 2 / 15
DUNE FGT Near Detector
The various components of the FGT near detector for DUNE are,
Active straw tube tracker (STT)
4π lead-plastic scintillator Electromagnetic Calorimeter surrounding theSTT, consisting of a forward, backward and barrel type electromagneticcalorimeter
0.4 T dipole magnet inside which the STT and ECAL modules will reside
4π muon-ID detector made of Resistive Plate Chambers (RPC) whichwill surrond the dipole magnet and will also be outside the magnet
Soumya (IITG) ECAL Energy Resolution November 12, 2015 3 / 15
Figure : Layout of HIRESMNU with external muon detectors
Soumya (IITG) ECAL Energy Resolution November 12, 2015 4 / 15
Figure : Layout of HIRESMNU with external muon detectors
Soumya (IITG) ECAL Energy Resolution November 12, 2015 5 / 15
DUNE Near Detector ECAL Parameters
Forward ECAL: 60 layers of alternating horizontal/vertical plastic scintillatorbars per 1.75 mm of lead along the z-direction. Dimensions of each plasticscintillator bar is 3.2 m × 2.5 cm × 1 cm. 128 bars per scintillator plane and7680 scintillator bars in total. There will be two sided readout via extrudedWLS fiber and SiPM. 20 Xo .
Barrel ECAL: Will surround the sides of the STT. 16 layers of plasticscintillator bars (horizontal along the axis of the magnet) per 3.5 mm of leadalong the z-direction. Same dimensions of scintillator bars like forward ecal.128 bars per scintillator plane and 16,384 scintillator bars in total. 10 Xo .
Backward ECAL: 16 layers of alternating horizontal/vertical plasticscintillator bars per 3.5 mm of lead along the z-direction. Same dimensions ofscintillator bars like forward ecal. 128 bars per scintillator plane and 2048scintillator bars in total. 10 Xo .
Soumya (IITG) ECAL Energy Resolution November 12, 2015 6 / 15
FGT ND-ECAL Simulation Progress
To simulate and optimize the ECAL in the HiSoft frameworkNow has a new repository called dunefgt created by Tyler.
GDML geometry of the forward, backward and the barrel ecal has beenprepared and initialized.
The preliminary simulation has been done by shooting 2 GeV photons,electrons, positrons, pizeros and muons for 500 art events into the forwardecal
To find the energy resolution of the forward, backward and the barrel ecal fordifferent values of incident energy of incoming electrons and photons and fordifferent angles of incidence
Soumya (IITG) ECAL Energy Resolution November 12, 2015 7 / 15
2 GeV Electron- Energy deposited and step size for allsteps and for steps in scint. bars
Entries 5553578Mean 0.1041RMS 0.1093
Energy (MeV)0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Ste
ps
0
50
100
150
200
250
300
350
400
450
310×
Entries 5553578Mean 0.1041RMS 0.1093
Energy deposited per step
Energy deposited per step in scintillator bars
Entries 5553578Mean 0.0172RMS 0.03249
Step Size (cm)0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2
Ste
ps
0
100
200
300
400
500
600
700
310×
Entries 5553578Mean 0.0172RMS 0.03249
Step sizeStep size in scintillator bars
Figure : plots of energy deposited per step and step size for all G4 steps and for all G4steps in the scintillator bars
Soumya (IITG) ECAL Energy Resolution November 12, 2015 8 / 15
Peak around 88-88.5 KeV! Why?
Figure : Source: PDG Review. Peak at 88 KeV corresponds to atomic photoelectriceffect (electron ejection, photon absorption)
Soumya (IITG) ECAL Energy Resolution November 12, 2015 9 / 15
PDG code of particles for .1 MeV G4 steps and for all steps
PDG code of EM Shower Daughters
Entries 74470Mean 21.69RMS 2.445
PDG Code40− 20− 0 20 40
0
10000
20000
30000
40000
50000
60000
70000
PDG code of EM Shower Daughters
Entries 74470Mean 21.69RMS 2.445
(a) PDG Code of particles for .1 MeV steps
PDG code of EM Shower Daughters
Entries 1114296Mean 8.35RMS 8.844
PDG Code40− 20− 0 20 40
0
100
200
300
400
500
600
700
800
900310× PDG code of EM Shower Daughters
Entries 1114296Mean 8.35RMS 8.844
(b) PDG Code of particles for all steps
Soumya (IITG) ECAL Energy Resolution November 12, 2015 10 / 15
Downstream ECAL Energy Resolution
Figure : Average measured energy from all the scintillator bars per event vs the incidentelectron energy for normal incidence
Soumya (IITG) ECAL Energy Resolution November 12, 2015 11 / 15
Downstream ECAL Energy Resolution
Soumya (IITG) ECAL Energy Resolution November 12, 2015 12 / 15
Downstream ECAL Energy Resolution
Soumya (IITG) ECAL Energy Resolution November 12, 2015 13 / 15
Future Plan
Find the energy resolution of the backward and barrel ecal
Effect on energy resolution of ecal for varying angles of incidence of incomingbeam
Any Suggestions, please?
Soumya (IITG) ECAL Energy Resolution November 12, 2015 14 / 15
Thank You
Soumya (IITG) ECAL Energy Resolution November 12, 2015 15 / 15