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AGENDA
CALORIMETRY and other subdetectors session
About 5 hours session
J-C. BRIENT
V. VRBA
S. MANEN
P. CHECCHIA
V. KORBEL
J. CVACH
B. DOGOLSHEIN
T. TAKESHITA
J. REPOND
V. AMMOSOV
E. FISK
M. PICOLLO
LLR
IP-ASCR
LPC
PADOVA
DESY
IP-ASCR
MEPhI
SHINSHU
ANL
IHEP
FNAL
LNF
Status report on the W-Si ECAL
Silicon pad sensors for the W-Si ECAL
Readout electronics for the W-Si ECAL
Status of the tile-silicon ECAL project
Status of the tile HCAL
Tile and fiber measurement for the tile HCAL
Readout of the tile HCAL with silicon PM
ACFA/JLC calorimeter studies
In search for an active medium for the HCAL
Progress report on the digital HCAL at IHEP
Scintillator based muon detector
Status on the muon detector
J-C BRIENT LLR
30’
30’
30’
30’
30’
30’
20’
20’
25’
25’
10’
20’
CALORIMETER EM
2 projects on the way
- LCcal (Italian project)
Lead/tiles+3 planes of silicon (next september)
-CALICE collaboration
Silicon – tungsten (40 layers)
30 layers in prototype (end of 2003)
Project
LCcal
active medium
tile+fiber
silicon matrix
CALICE silicon matrix
readout
PM (just for proto.)
chip on PCB
chip (Opera) on PCB
dedicated R&D for new VFE chip
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LCcal project
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LCcal
Scintillator tiles
• 3 mm Kuraray SCSN-61(25x25 cm2)
• 3 mm Bicron BC-408 (25x25 cm2)
LARGE tile plates
BUT SMALLER
CELLS
Machined with vacuum plate as holder
Whole Production starting now
P.Checchia presentation
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- cross talks
- light collection effic.
- in B-field ??
The ACFA calorimeter design
In sense very similar to the LCcal
 tiles + 2 high granularity planes (not in Si) ECAL
and projective tiles /lead in the HCAL
- nice e/h ratio almost flat in momentum
- some developments on the photodetector side
-main concerns on the granularity optimisation
photon/pion geometrical separation  PFLOW
In progress , we can hope to have informations
at LCW2002
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CALICE coll.
Physics prototype
-- tungsten
 good first prod.
ITEP,IHEP,LLR
-- Si. matrix
 in production
IP-ASCR, MSU,PICM
-- VFE chip
 first version in prod
LAL
-- Digital part + DAQ
in definition in UK
5 labs(IC,UCL,Manch.,Camb.,Birm.)
J-C BRIENT LLR
Top view of the pads
in the Si matrix
CALICE coll.
Deposited resistors – before deposition
5 masks DC coupling
1 cm
THEN
Deposition of Si am. for the
AC coupling
St Malo, 13th April 2002
See V.Vrba presentation
8
J-C BRIENT LLR
Václav Vrba, Institute of Physics, AS CR
CALICE coll.
R&D for the final project
- silicon matrix  large scale prod.
- VFE chip
IP-ASCR, MSU,PICM,SNU,LLR
 Proto. to fundery
LAL, LPC
- A new
design of the detector slab
 LLR,Manchester, …(need volunteers here)
-3 gains
- low noise
- low power
- different techno.
- MUX+ ADC’s
included ….
Presentation of S.Manen
J-C BRIENT LLR
There are good reasons to believe in a cost of 2
€/cm² for the silicon
For the complete set ECAL + HCAL + Muon-CH ( MCH)
CMS
Calice -FLC
216
132/178
18/40% reduction
Cost of the calorimeter
W-Si ECAL cost … still an argument ?
J-C BRIENT LLR
My personal view on the ECAL status
- expected performances on jets for LCcal missing
only in progress for ACFA projective tiles
- advanced study on the hardware side
on AFCA and LCcal
only in progress for W/Si-CALICE
LINK with PFLOW and physics results
Volunteers needed !!!
J-C BRIENT LLR
HADRONIC CALORIMETER
Evolution or revolution?
HC1
 5X5 to 20x20 cm tiles/steel sampling
known technology for a semi-analytic PFLOW (tiles size)
Scint. Tiles/lead projective tower + photodetector (APD,…)
HC2
 1X1 cm digital readout
Totally PFLOW oriented , A brand new way to measure energy
(well not so brand new …)
J-C BRIENT LLR
TILE HCAL
Well covered by R&D
 scintillator – fiber – geometry
ITEP,DESY,IP-ASCR
Not covered by R&D
 AGING – Perf. In B-field – photodetector
(in preparation at ITEP,….)
APD , Si PM , multi-anode APD,…..
far from a clear view on that side
(review by Volker Korbel and talks by B.Dolgoshein, J.Cvach)
J-C BRIENT LLR
Search for optimal WLS-Fibre arrangement
10 different TF configurations studied
• WLS fibre end polished, no reflector
• air gap contact to tile
• Tyvek reflector on tile
tile irradiated with
collimated Ru106 source,
simple current measurement for LY
Ru106 source, s ~ 2cm
Talks from V.Korbel (DESY)
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Talks from J.Cvach (IP-ASCR)
x axis (cm )
Groove effect not masked by source profile
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4.8
0
PM
y axis (cm)
3.2
3
6.4
fiber in groove
6
1.6
36
32
28
24
20
16
12
84
0
0
response to Sr90
32-36
28-32
24-28
20-24
7 16-20
3,5 12-16
8-12
0
4-8
0-4
y axis (cm)
6.4
x axis (cm )
4.8
3.2
1.6
36
32
28
24
20
16
12
8
4
0
0
response to Sr90
Example: tile with middle groove
fiber on
side
Silicon photomultiplier
Talks by B.Dolgoshein
Pixel gain sensitivity
SiPM
APD
on voltage
dG/G ~ 7 dV/V
dG/G ~ 3% for dV=0.1 V
(V=24.5 V)
on temperature
dG/G ~ 1.7 dT/T (oK)
dG/G ~ 0.5% for dT=1o
(To=-20oC)
WARNING on saturation effect !!!
on efficiency
dG/G ~ 75 dV/V
dG/G ~ 17 dT/T
 number of pixel/mm²
J-C BRIENT LLR
Scintillator in US
Advantages:
Old technology
Effort in US :
NIU-NICCAD
Investigations
Different types of scintillator
Fiber routing and light losses
Readout
Has to work in B-field
Choices: Avalanche photodiodes: low gain
Plot by V Rykalin
Cosmic ray test
Realistic set-up with fibers etc.
Hybrid photodiodes: complicated readout
VLPC: Visual Light Photon Counters
Quantum efficiency: 60 – 80 %
Gain: 105 – 106
Operates at 7 0K
ADC counts
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MRS: Metal Resistor Semiconductor Photodiodes
Recent development
Quantum efficiency: ~30%
Operates at room temperature
DIGITAL HCAL
Which active medium - talks by V.Ammosov (IHEP), J.Repond (ANL)
- RPC’s (avalanche or streamer)
- SDT (short drift tubes)
- GEM (proposal from Uni.Texas)
Acceptable Rates and occupancy
Thickness
Cost for large area
Cross talk
Efficiency for a mip
Which radiator
Nobody works here – need volunteers
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First results for RPC’s at IHEP
(V.Ammosov)
m.i.p. efficiency about
Fake (noise) about
cross talks
95-98 %
0.2 Hz/cm²
1.06 (SDT) /1.2 (RPC’s)
Very encouraging results BUT
need a similar measurement with a multilayers device
using thin readout electronics ,…..
A weak place today , NEED VOLUNTEERS
J-C BRIENT LLR
Talks by J.Repond (ANL)
Test chambers
Obtained from FNAL
Glass: t = 2.1 mm
Single gap: 2.1 mm
Gas
Freon
62%
Argon
30%
Isobutene 8%
Test set-up at Argonne
Cosmic ray telescope
Computer controlled readout
- Events written to disk
- Possibility to readout large number of channels
J-C BRIENT LLR
conclusion
Tile-HCAL is a known technollogy
well covered by R&D and a prototype is foreseen
Need clearly work on photodet. and readout system
Digital HCAL is a rising activity
It looks promising but needs definitely more work
Don’t be afraid by calorimeters, (ILC-detector panel…)
and join us in this adventure….
J-C BRIENT LLR