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Performance Goals -> Motivation
Analog/Digital Comparisons
E-flow Algorithm Development
Readout R&D
Summary
Optimization of the Hadron Calorimeter Optimization of the Hadron Calorimeter for Energy-Flow Jet Reconstructionfor Energy-Flow Jet Reconstruction
Stephen R. Magill
Argonne National Laboratory
Performance Goals for HCAL - Performance Goals for HCAL - MotivationMotivation
Physics Requirement : separately id W, Z using dijet mass in hadronic decay mode (~70% BR) -> higher statistics physics analyses
Detector Goal : measure jets with energy resolution /E ~ 30%/E
Optimize HCAL to be used with ECAL andTracker in E-flow jet reconstruction –
• Charged particles ~ 60% of jet energy -> Tracker• Photons ~ 25% of jet energy -> ECAL• Neutral Hadrons ~ 15% of jet energy -> HCAL
Calorimeter challenge : charged/neutral showerseparation requires high granularity, bothtransverse and longitudinal, to reconstruct showers in 3-D
W, Z
30%/30%/EE
75%/75%/EE
HCAL Optimization Performance HCAL Optimization Performance MeasuresMeasures
• Study absorber type/thickness with JAS, standalone GEANT3 program-> shower containment, hit density, single particle energy resolution
• Tune transverse granularity and longitudinal segmentation in JAS-> separation of charged/neutral hadron showers
• Test both analog and digital readout techniques-> comparison of energy/hit density readout methods
• Develop and optimize E-flow algorithm(s)-> dijet mass resolution
TungstenCopper
Uranium
SS
4 ’s, 2 K0L, +, -
Standalone GEANT3 VersionStandalone GEANT3 Version
TESLA TDR Detector Geometry
e+e- ZZ (500 GeV CM)
SD Detector :
ECAL HCAL 30 layers 34 layers W(0.25 cm)/Si(0.04 cm) SS(2.0 cm)/Scin(1.0 cm) ~20 X0, 0.8 I ~40 X0, 4 I ~5 mm X 5 mm cells ~1 cm X 1 cm cells
Modified SD A:
ECAL30 layers W(0.25 cm)/Si(0.04 cm)~20 X0, 0.8 I ~1 cm X 1 cm cells
HCAL60 layersW(0.7 cm)/Scin(1.0 cm)~120 X0, 4.5 I ~1 cm X 1 cm cells
Modified SD B:
ECAL30 layers W(0.25 cm)/Si(0.04 cm)~20 X0, 0.8 I ~1 cm X 1 cm cells
HCAL60 layersW(0.7 cm)/Scin(1.0 cm)~120 X0, 4.5 I ~3 cm X 3 cm cells
Java Analysis Studio (JAS)Java Analysis Studio (JAS)
Modified SD C:
ECAL30 layers W(0.25 cm)/Si(0.04 cm)~20 X0, 0.8 I ~1 cm X 1 cm cells
HCAL60 layersW(0.7 cm)/Scin(1.0 cm)~120 X0, 4.5 I ~5 cm X 5 cm cells
Neutral particles in CAL - in ECAL- KL
0, n, nbar in HCAL
ee++ee-- -> ZZ – Neutral Particles in CAL -> ZZ – Neutral Particles in CAL
Analog Readout – perfect cluster
Photon Analysis in SD – Analog vs Digital?Photon Analysis in SD – Analog vs Digital?
/mean ~ 16%/mean ~ 16%
5 mm X 5 mm EM cells
Non-linear behaviorNon-linear behaviorfor dense showersfor dense showers
Analog EMCAL ReadoutAnalog EMCAL Readout
Neutral Hadron Analysis – Analog vs Neutral Hadron Analysis – Analog vs DigitalDigital
KKLL00 Analysis – SD Detector Analysis – SD Detector
Analog ReadoutAnalog Readout
/mean ~ 30%
Compare to digital
KKLL00 Analysis – SD Detector Analysis – SD Detector
Digital ReadoutDigital Readout
/mean ~ 26%
Average : ~43 MeV/hit
linear behavior forhadron showers
Analog EM + Digital HAD x calibration
KKLL00 Analysis – Modified SD Analysis – Modified SD Analog ReadoutAnalog Readout
SD A (1 cm X 1 cm)
SD B (3 cm X 3 cm)
/mean ~ 26%
/mean ~ 35%
KKLL00 Analysis – Modified SD Analysis – Modified SD Digital ReadoutDigital Readout
SD A (1 cm X 1 cm)
SD B (3 cm X 3 cm)
/mean ~ 20%
/mean ~ 25%
HCAL (only) Digital HCAL (only) Digital ResultsResults
/mean ~ 28%
/mean ~ 28%
/mean ~ 32%
SD
SD A
SD B
1 cm X 1 cm
1 cm X 1 cm
3 cm X 3 cm
KKLL00 Analog vs Digital – Scintillator vs Gas Analog vs Digital – Scintillator vs Gas
From A. Sokolov, CALICE
Scintillator Analog/DigitalScintillator Analog/Digital
Scintillator Analog/RPC DigitalScintillator Analog/RPC Digital
Compensation in Digital HCAL?Compensation in Digital HCAL?
Neutral Hadron Measurement SummaryNeutral Hadron Measurement Summary
No-Clustering E-Flow AlgorithmNo-Clustering E-Flow Algorithm
1st step - Track extrapolation thru Cal – substitute for Cal cells in road (core + tuned outlyers) – Cal granularity optimized for separation of charged/neutral clusters
2nd step - Photon finder (use analytic long./trans. energy profiles)
3rd step - Jet Algorithm on Tracks and Photons
4th step – include remaining Cal cells in jet (cone?)
Systematic Approach : Tracks first (60%), Photons next (25%),Neutral hadrons last (15%)
Track Extrapolation/Cal Cell SubstitutionTrack Extrapolation/Cal Cell Substitution
Starting studies of HCAL optimization for E-Flow jet analysis- optimal transverse cell size and longitudinal segmentation- optimal absorber material/thickness- analog vs digital readout
Starting development of E-Flow analysis tools- Track extrapolation -> cal cell substitution analysis - photon analysis
Beginning readout R&D-Scintillator in HCAL-RPC
SummarySummary