the calice si-w ecal - physics prototype
DESCRIPTION
The CALICE Si-W ECAL - physics prototype. 2012/ Apr / 25 Tamaki Yoshioka (Kyushu University) Roman Poschl (LAL Orsay ). Introduction - SiW ECAL. The SiW Ecal in the ILD Detector. Basic requirements Extreme high granularity Compact and hermetic Basic choices - PowerPoint PPT PresentationTRANSCRIPT
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The CALICE Si-W ECAL- physics prototype
2012/Apr/25Tamaki Yoshioka (Kyushu University)
Roman Poschl (LAL Orsay)
2012/Apr/25 KILC12@Daegu 1
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2012/Apr/25 KILC12@Daegu 2
Introduction - SiW ECAL
The SiW Ecal in the ILD Detector
SiW ECAL is designed as particle flow calorimeter
• Basic requirements Extreme high granularity Compact and hermetic
• Basic choices Tungsten as absorber material (X0=3.5mm, RM=9mm, λI=96mm)
Narrow showersAssures compact design
Silicon as active materialAllows for pixelisationLarge signal/noise ratio
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2012/Apr/25 KILC12@Daegu 3
The CALICE Collaboration
Calorimeter R&D for a future linear collider
~330 physicists/engineers from 57 institutes and 17 countries from 4 continents
- Integrated R&D effort
- Benefit/Accelerate detector development due to common approach
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2012/Apr/25 KILC12@Daegu 4
The CALICE Mission
E. Garutti
Si-W ECAL
Scint. Tiles-Fe AHCAL
Scint. Strips-Fe TCMT
Final Goal:A highly granular calorimeteroptimized for the Particle Flowmeasurement of multi-jets final stateat the International Linear Collider
ImagingCalorimeter
Intermediate task:Build prototype calorimeters to• Establish the technology• Collect hadronic showers data with
unprecedented granularity to Tune clustering algorithms Validate existing MC models
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SiW ECAL Physics Prototype
62 m
m
Front End electronics zone
Silicon wafer
Tungsten: H structure
Shielding PCB
62 mm
Thickness: 525µm
Total: 9720 Pixels/Channels
Absorber layers30 layers of tungsten:• 10 x 1.4 mm (0.4X0)
• 10 x 2.4 mm (0.8X0)
• 10 x 4.2 mm (1.2X0)24X0 in total, 1 λI
Active layersSilicon Pad:• 6x6 PIN diode matrix
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2012/Apr/25 KILC12@Daegu 6
Test Beam w/ Phys. Proto.
Two electrons
• 2006, ECAL 2/3 equippedLow energy electrons (1-6 GeV at DESY), high energy elecrons (6-50 GeV at CERN)
• 2007, ECAL nearly completely equippedHigh energy pions (6-120 GeV at CERN), Tests of embedded electronics
• 2008 FNAL, ECAL completely equippedPions at small energy
Experimental setup Zoom into ECAL Particle distance = 5 cmNo confusion!!
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Particle SeparationHigh granularity allows for application of advanced imaging processing techniques
e.g. Hough transformation
Secondary muon within electron shower
Events recorded in test beam
Two pions entering the SiW Ecal
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Efficiency of Particle Separation
10 MIP Hits20 MIP Hits30 MIP Hits
Fraction of common cells
Dete
ctio
n e
ffici
ency
Dete
ctio
n e
ffici
ency
Distance MIP shower axis [mm]
11
Efficiency ~ 100% for up to 50% shared hits Full separation fordistances > 2.5cm
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2012/Apr/25 KILC12@Daegu 9
Hadronic Showers in the SiW ECALEasy at high energies
Interaction
Initial Pion
Outgoing Fragments
Scattered Pion
Ejected Nucleon
Simple but nice
Inelastic reaction in SiW ECALFireBall event
Short truncated showerspointlike event
High granularity permits detailed view into hadronic shower
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2012/Apr/25 KILC12@Daegu 10
Hadronic models in Geant4Variety of models available to describe hadronic showers
Discriminative power by high granularity !?
A. Dotti (G4 Collaboration): “Rough granularity of LHC calorimeters limits possibilities”, “CALICE is the perfect tool”
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Finding the interaction pointComplex and impressive
Interaction
Initial Pion
Outgoing Fragments
Scattered Pion
Ejected Nucleon
Difficult at small energies
Check for absolute increase of energy in consecutive layers
Check for relative increase of energy in consecutive layers
Efficiency: 84% for 10 GeV and 64% for 2 GeV
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2012/Apr/25 KILC12@Daegu 12
Event Types and RatesExplore and understand of what we can “see” with the SiW ECAL
Events with found hadronic interaction Events w/o found hadronic interaction
Cross section of underlying scattering processes well modeled by GEANT4Decomposition of interactions demonstrate sensitivity to details of interactions
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Transverse Profiles (low energies)
Shower width/mm
arb. units
0 100 0 100 0 100
0 100 0 100
MC/Data2
• 2-10 GeV• QGSP_BERT
• MC overshoots data for large radii at all energies• Relatively better description at higher energies
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2012/Apr/25 KILC12@Daegu 14
Transverse Profiles(High energies)
Data comparedwith QGSP_BERT
Data comparedwith QGSP_BERT
Transverseprofiles
Shower radius
Rhit/mmRhit/mm
Ebeam/GeV
<R
hit>
/mm
JINST 5 2010 P05007
Small energy OK for “BERT” modelsTowards high energy : Underestimation of content in SiW ECAL
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Longitudinal Profiles
Pi @ 2GeV Inelastic reactions
BERT gets tails about right Models have different approaches for shower composition
No satisfactory description of longitudinal shower profile
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Longitudinal ProfilesPi @ 8GeV Inelastic reactions
Again tails about right Models have different approaches for shower composition
No satisfactory description of longitudinal shower profile
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2012/Apr/25 KILC12@Daegu 17
Energy Deposition in different ECAL Depths
Layer 1-3:
Nuclear breakup
Layer 5-20:
elm. component
Layer 30-50:
Shower hadrons
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2012/Apr/25 KILC12@Daegu 18
Details of Pointlike Events
Pi @ 2GeV
Recognition of these events is result of large granularity
Pointlike events are relatively well modeled by QGSP_BERT
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Summary
• Successful R&D for a highly granular electromagnetic calorimeter• Detector concept is built on Particle Flow
Physics Prototype (2005-2011)- Energy resolution ~17%/√E- Signal to Noise Ratio ~8/1- Stable calibration
- Capacity of separating particles impressively demonstrated by test beam analysis
- Unprecedented realistic views into hadronic showers thanks to high granularity
Technological Prototype(2010-…)Next talk by Roman