lccal * : an r&d project for the electromagnetic barrel calorimeter
DESCRIPTION
Lccal * : an R&D project for the Electromagnetic barrel Calorimeter. TALK SUMMARY. Design principles Prototype description Status of the production Beam test results Future plans. * Official INFN R&D project, official DESY R&D project PRC R&D 00/02 - PowerPoint PPT PresentationTRANSCRIPT
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2002 08 28P. Checchia LCWS02 Jeju 1
Lccal*: an R&D project for the Electromagnetic barrel
Calorimeter
•Design principles
•Prototype description
•Status of the production
•Beam test results
•Future plans
* Official INFN R&D project, official DESY R&D project PRC R&D 00/02Contributors (Como, LNF, Padova, Trieste): M. Alemi, A.Anashkin, M.Bettini, S.Bertolucci, E. Borsato, M. Caccia, P.C, C. Fanin, S. Miscetti, M. Prest, R. Peghin, L. Ramina, E. Vallazza ….
TALK SUMMARY
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2002 08 28P. Checchia LCWS02 Jeju 2
Design principlesFrom the TESLA TDR requirements:
2 solutions: •Si W
• Shashlik (thanks to CALEIDO)
Alternative solution:
Keep SiW advantages (flat geometry, high granularity)
Erec. not from Si but from Scintillator-WLS fibers
Reduce (factor >10) the number of channels
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2002 08 28P. Checchia LCWS02 Jeju 4
Prototype description
(Slightly reduced to cope with budget)
Pb/Sc + Si
Scintillation light transported with WLS σ tail fibers:
Cell separation with grooves in Sc. plates with Tyvec strips inside
Coupled with clear fibers (to PM):
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2002 08 28P. Checchia LCWS02 Jeju 5
Prototype (cntd)3 Si planes
Goal: shower-shower separation:
•Pad dimension< shower dimension: .9x.9 cm2
•Longitudinal sampling:3 planes
•Analogic ROVA hdr9c from IDEas
•Next year: shower dimension reductionW absorber
Actual design
•Detector: 6x7 pads
•Plane: 3x2 detectors
pcb contact with conductive glue
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2002 08 28P. Checchia LCWS02 Jeju 6
Production status• Scintillator tiles:
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2002 08 28P. Checchia LCWS02 Jeju 7
• 3 mm Kuraray SCSN-61 (25x25 cm2)
• 3 mm Bicron BC-408 (25x25 cm2)
Machined with vacuum plate as holder
Whole Production (>50 tiles) done
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2002 08 28P. Checchia LCWS02 Jeju 8
Production status• Scintillator tiles:
Fibres:
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2002 08 28P. Checchia LCWS02 Jeju 9
To make the 2.4 cm radius curvature : middle temperature(500-700) oven
Splicing going on :
>3 ph e- /m.i.p./tile obtained
stable in >30 day time
Kuraray 1mm d. Y11 300 ppm multicladdingFace polished and aluminized by sputtering
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2002 08 28P. Checchia LCWS02 Jeju 10
Production status• Scintillator tiles:
Si pad detectors:
Fibres:
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2002 08 28P. Checchia LCWS02 Jeju 11
CV
0,00E+00
2,00E-11
4,00E-11
6,00E-11
8,00E-11
1,00E-10
1,20E-10
1,40E-10
0 5 10 15 20 25 30 35 40 45
Vbias (V)
C (F
) Serie1
1 detector fully mounted and tested
Full depletion at <30 V
30 pF
C vs Vbias
20 detectors produced by ITE (Warsaw) with reasonable performance (under test now)
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2002 08 28P. Checchia LCWS02 Jeju 12
Production status• Scintillator tiles:
Si pad detectors:
Fibres:
Detector assembling:
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2002 08 28P. Checchia LCWS02 Jeju 13
First segment (2 X0 ) completed
Pb plates produced ( >50)
Mechanical support for beam test to be builded in Frascati
Fiber insertion , tile assembling up to 45 Pb/Sc layers: starts in september
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2002 08 28P. Checchia LCWS02 Jeju 14
Test beam* resultsSet up:
•2 planes Si μstrip telescope
•2 trigger Scintillators
•Calorimeter first segment (2 X0) read by PM
•1 Si pad detector
*CERN SPS H4
beamcal
e- 40 / 50 GeV
π 50/150 GeV (used as m.i.p.)
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2002 08 28P. Checchia LCWS02 Jeju 15
Test beam results CALORIMETER (2.1 X0)
4 layers
m.i.p.→check light output and uniformity in Light collection:
Ratio signal/sigma →lower limit for photoelectrons
Nphe>5.1 /layer
→ cal(45layers):>220 phe/m.i.p. ± 20%
good uniformity:
Simulated Light collection disunifority(20%)
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2002 08 28P. Checchia LCWS02 Jeju 16
Test beam results: CALORIMETER (2.1 X0)
Too few layers to give Energy resolution but enough to show e/π separation
150 GeV π
50 GeV electrons
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2002 08 28P. Checchia LCWS02 Jeju 17
Test beam results: Si pad detector
m.i.p. signal >4 sigmas
(coherent noise subtraction not optimized)
m.i.p. inside pad
50 GeV electrons
No saturation!
Out of detector
(6.3x 5.4 cm2 )
50 GeV electronsPosition resolution < 2mm
Correction for pad dimention not included:
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2002 08 28P. Checchia LCWS02 Jeju 18
Test beam results: Si pad detector
150 GeV π
50 GeV electrons
e/π behaviour clearly
different
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2002 08 28P. Checchia LCWS02 Jeju 19
Future Plans
• complete the detector (next month)
• go to test beam (low energy Frascati, high energy DESY/CERN)
• analyse two particle impact
• substitute the absorber: Pb to W (next year)
• study new optical device (i.e. multianod PM’s)
• collaborators are wellcome
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2002 08 28P. Checchia LCWS02 Jeju 20
Conclusions• The proposed prototype is going to be completed (all the
production problems are solved)• A preliminar beam test at CERN with a partial set up
gave reasonable and incouraging results• Tests with the complete detector are necessary to answer
to all questions • …. but it they will be successfully answered, why do not
include a calorimeter made following this technique into the general LC simulation and Pattern recognition?
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2002 08 28P. Checchia LCWS02 Jeju 21
Future Beam Tests