Transcript Document

Calorimetry
• Performance goals
• Electromagnetic Calorimetry (ECal)
• Hadronic Calorimetry (HCal)
– Digital
– Analog
• Particle-flow algorithms (formerly
energy-flow)
– Simulations
– Particle identification (Digi/Ana)
• Test Beam
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
2
Performance goals
• Jet energy measurement precise
enough to separate Ws and Zs in
hadronic decays on an event-byevent basis: ΔE = 0.3 sqrt(E [GeV])
• Use track momenta for charged
clusters; cal only for for neutrals:
particle-flow algorithms
• Identify non-pointing neutral clusters
• Excellent hermeticity
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
3
ECal
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Si-W (Oregon+SLAC)
Si-W-Scint (Kansas)
Scint-W (Colorado)
Crystal (Iowa+Caltech)
Cerenkov-compensated
(Iowa+Fairfield)
All analog
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
4
Si-W ECal
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0.5 cm x 0.5 cm
0.3 mm Si
3.5 mm/layer
30 layers
Rin = ~142 cm
Zmax = 2.1m
20X0, 0.8λ0
Sampling ~2%
5T field
Dhiman Chakraborty
• Small Rm and fine
segmentation aids
PFAs
• Europe on board
• Design well under way
• Electronics rough draft
complete
• Mechanical conceptual
design started.
• Tests, more
simulations in the
offing
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
5
Si-W-Scint. & Scint.-W
• More affordable than Si-W
• Somewhat coarser segmentation –
limited by fiber routing
• Fine sampling and timing
• Efficiency and uniformity need to be
established – gang 3-5 tiles
• Choice of photodet, fiber coupling …
• Europe, Asia on board on scint. option
• Detailed simulation studies in progress
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
6
Crystal
Cerenkov
• Cerenkov• Inexpensive
compensated
• Excellent E resol.
precision
(100% sampling)
calorimetry
• No longitudinal
• Uses Cerenkov light
segmentation –
limitation to PFA?
to measure e,γ;
ionization for
• Still in early stage
hadrons, e –
• Extensive
combine the two
simulations needed
and planned
• Not much known
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
7
HCal
• RPC – Digital (ANL, U. Chicago, Boston,
FNAL)
• Scintillator – Digital (?) (NIU, UIC)
• GEM – Digital (U Texas - Arlington)
• Scintillator – Analog (Colorado)
• ~34 layers, ~3.5 cm thick w/ 2.5 cm thick
stainless steel or similar absorber
• ~ 4λ0, ~6% sampling
• 1-10 cm2 cells
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
8
RPC DHCal
• Multiple gas gaps, glass substrate,
graphite/ink resistive layer
• Avalanche mode operation
• Prototypes constructed,
electronics, DAQ in place, initial
studies are very encouraging
• Extensive testing, readout chip
design in progress
• Backed by detailed simulation
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
9
Scintillator DHCal
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Proven technology
Somewhat larger cells
Cheap production by in-house extrusion
MANY options for fiber routing, surface
treatment, groove shape, transducer
tested with encouraging results
• Cosmic ray prototype stack ~ready
• Bolstered by extensive simulation
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
10
GEM DHCal
• New technology
• Double-gap
• First prototype w/electronics
assembled, operational
• Initial tests with CR, source at par
with results shown by developers
• Multichannel prototypes under
construction
• Backed up by extensive simulation
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
11
Scint. HCal (analog)
• Similar to Scint DHCal, but ~2.5
times larger tiles
• Improve lateral resolution by
staggering
• Cell prototyping done
• Stack prototype next
• Simulation studies in progress
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
12
Particle-flow algorithms
• Several calorimeter groups are
deeply involved in simulation and
software development as well as
PFA development (NIU, ANL,
Colorado, UTA, …)
• First jet reconstruction results are
most encouraging, prompting us to
more realistic simulations and
sophisticated reco algorithms
• Much effort invested
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
13
Muon & PID Summary
R. Wilson – CSU: Particle ID Software Infrastructure
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Embedding PID in the overall LCD/JAS s/w infrastructure?
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Fast Simulation/Reconstruction : dE/dx tool; code checks; muon fast simulation.
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Cross subsystem PID.
A. Maciel – NIU: Simulation Software Development
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Extension of generalized and universal simulation
framework – new worldwide effort.
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Planar muon detector example with 45o strips.
Big advance!
Dhiman Chakraborty
u vs. v for 2 tracks
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
14
Muon & PID Summary (cont.)
C. Milstene – NIU: Muon ID Software Development
 Resurrection of m code.
 Verification of M. Piccolo’s muon ID
for single particles and b-b events.
G. Fisk – Fermilab: Scintillator Muon Detector
Prototype Planes: Description
 General description of scintillator strip layout.
M. Wayne – UND: Fiber Connections & Routing
 Discussion of fiber associated with bringing the WLS light out
of the scintillator strips and onto a multi-anode
photomultiplier.
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
15
Muon & PID Summary (cont.)
P. Karchin – WSU: MAPMT Readout and Calibration
Issues
 Test results on Hamamatsu M-16 multi-anode PMT. Calibration ideas.
R. Wilson – CSU Geiger Photodiode Array Readout
Test
 Description of tests performed on prototype APD (avalanche photodiode).
M. Piccolo – INFN RPC Prototype Design Issues
Plateau
 First test results for new glass RPCs. curve
 Rate capability studies
 Test Beam at Frascati
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
16
Prototype Module Layout
5.0 m
2.5m
43 full strips
43 short strips
3.6m => 0m long
Read out: both ends of full strips; one end of short strips (except the shortest 22).
2*(43 + 21) fibers/side =128 channels = 8 (1.2mm dia) fibers/pix * 16(4 x 4mm2) pixels
=> Equivalent of One MAPMT/prototype plane
3.6m (L) x 4.1cm (W) x 1cm (T)
Dhiman Chakraborty
Calorimetry + muon/p-id summary
LC workshop, Cornell, 16 July, '03
17