Study of Calorimeter performance using the LC full simulator

1
Study of Calorimeter performance using the LC
full simulator

• The 8th ACFA Workshop
• Yoshihiro Yamaguchi (Tsukuba U.)

M. -C. Chang (RCNS, Tohoku U.) K. Fujii (KEK) T.
Fujikawa (RCNS, Tohoku U.) S. Kim (Tsukuba U.) H.
Matsunaga (Tsukuba U.) A. Miyamoto (KEK) T.
Nagamine (RCA, Tohoku U.)
H. Ono (Niigata U.) A. L. C. Sanchez (Niigata
U.) T. Takeshita (Shinshu U.) A. Yamaguchi
(Tsukuba U.) S. Yamamoto (Graduate U.) T.
Yoshioka (ICEPP, Tokyo U.)
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Contents

• Introduction
• Calorimeter geometry
• Amount of materials
• EM CAL Performance
• HD CAL Performance
• Fine segmented Cell
• Study of Digital calorimeter
• Summary Future plan

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Standard Geometry (GLD)
Muon/Iron
Jupiter is Full simulator and MC truth
generator Based on Geant4
Solenoid
TPC
Hadron Calorimeter
IT
VTX
EM Calorimeter
Forward Cal
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Calorimeter in Jupiter

• Perform an analysis with ideal geometry to know
  ultimate performance.
• Each tower with one HD tower (12cm?12cm) and 3?3
  EM tower (4cm?4cm) is pointing to an interaction
  point.
• No crack between towers.
• Tower geometry and material can be modified
  easily.
• Implement realistic geometry in the next step.

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Calorimeter geometry
Parameter List
HDCal 130Layers 6.1 ?0
EM HD

• Endcap Inner R
• 40cm
• Barrel Tower Front R
• 210cm
• Endcap Tower Front R
• 270cm

Scinti. 2mm
12cm
Lead 8mm
EMCal 38Layers 27X0
Scinti. 1mm
12cm
Lead 4mm
Divide 3?3
Tower
Cut Calorimeter
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Amount of Materials
?0
X0
Radiation Length and Nuclear Interaction
Length measured from interaction point to CAL
front.
cos?
cos?
?0

• Radiation Length
• 0.05 0.2 X0
• (5.4X0 at cos? 0)
• Nuclear Interaction Length
• 0.02 0.1 ?0
• (2.8 ?0 at cos? 0)

X0
cos?
cos?
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Event Display (single electron)

• 1GeV electron incident angle to CAL is very small
  due to a magnetic field.
• 1GeV EM shower stops in the early depths in EM
  CAL.

8
EM CAL Performance (electron)
Worse resolution and non-linearity at 1GeV is due
to shower stopping at the early depth of EM CAL.
Linearity
Energy Deposit GeV
Energy GeV
Deviation
Deviation from Linearity
Energy GeV
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HD CAL Performance (pion)
Deviation from Linearity
Linearity (QGSP)
Energy Deposit GeV
Energy GeV

• Large non-linearity in the low energy region.
• Under investigation.

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HD CAL Performance (pion)
?sto 40.6?1.1 ?con 7.1?0.3 ?sto
38.0?1.2 ?con 9.0?0.8 ?sto 39.3?1.2
?con 8.4?0.6 ?sto 44.9?1.4 ?con
4.3?0.4 ?sto 46.33?0.35 ?con 0.9?0.4

• QGSP
• LHEP
• No Sol
• (QGSP)
• Front Cal
• (QGSP)
• Beam Test

Beam test from NIMA 487 (2002) 291-307 Configurati
on is 8mm lead and 2mm sinti. No EM Detector
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Fine segmented Cell

• Set new CAL geometry
• EM CAL divided 12?12, Cell size 0.83 0.92cm
• HD CAL divided 12?12, Cell size 0.92 1.4cm
• Use Hadron PhysicsList QGSP
• To study coarser segmentation, we sum the energy
  deposits in adjacent cells.

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Event Display (single pion)
pink -gt electron blue -gt muon yellow -gt
photon red -gt pi black -gt K0L green -gt
proton purple -gt neutron gray -gt other

• Incident particle ?- 100GeV
• Exact hits of TPC and merged hits of CAL are
  displayed.
• Color shows which particle makes hit.

Cell Size 1cmx1cm
Cell SizeEM 4cmx4cm, HD12cmx12cm
HDCAL
HDCAL
TPC
TPC
EMCAL
EMCAL
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Digital calorimeter

• Incident particle ?-, 2 200GeV, 500event
• Select ?- punching through EM CAL as a MIP.
• Non-linearity observed in of hits.
• Large constant term in energy resolution.

10GeV
of hits
Measured hits
Linearity
Energy GeV
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Definition of hit
Fraction of of hits in a cell
of hits in a cell is defined by the of
original particles incident onto the calorimeter
which cause the cell hit.
2 particles
1 particle
of hits in a cell

• 1cm?1cm single hit 100
• 2cm?2cm single hit 70
• Large difference between 1cm ?1cm and 2cm?2cm.
• Segmentation should be lt 2cm?2cm.

Blue cell is 1 hit Red cell is 2 hits
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Summary Future plan

• HD cal simulation does not reproduce beam test
  results.
• Discrepancy is observed in the resolution
  constant term.
• Large non-linearity in the low energy region.
• Need more extensive study.
• Cell size less than 2cm?2cm is favorable for PFA.
• We plan to study the calorimeter clustering with
  digital calorimeter.

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Buck up
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Jupiter/Satellites Concepts
For real data
Tools for simulation
Satellites
LEDA
URANUS
JUPITER
IO
Input/Output module set
JLC Unified Particle Interaction and Tracking
EmulatoR
Unified Reconstructionand ANalysis Utility Set
Library Extention forData Analysis
METIS
Monte-Calro Exact hits To Intermediate Simulated
output
Geant4 based Simulator
JSF/ROOT based Framework
MC truth generator
Event Reconstruction
Used Geant4.7.0.p01 and root.4.03.04
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HD CAL Performance
?sto 40.6?1.1 ?con 7.10?0.29 ?sto
38.0?1.2 ?con 9.02?0.79 ?sto 25.7?1.3
?con 17.42?0.43 ?sto 39.3?1.2 ?con
8.37?0.55 ?sto 44.9?1.4 ?con 4.29?0.38
?sto 46.33?0.35 ?con 0.84?0.38

• QGSP
• LHEP
• LCPhysics
• No Sol
• (QGSP)
• Front Cal
• (QGSP)
• Beam Test

Beam test from NIMA 487 (2002) 291-307 Configurati
on is 10mm lead and 2.5mm sinti.
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Definition of hit

• of hits in a cell is defined by the of
  original particles incident onto the calorimeter
  which cause the cell hit.

Scintillator
2 particles
1 particle
Blue cell is 1 hit Red cell is 2 hits