The ATLAS Hadronic Endcap Calorimeter
description
Transcript of The ATLAS Hadronic Endcap Calorimeter
Oct. 2001 James. L. Pinfold Lake Como 1
The ATLAS Hadronic Endcap Calorimeter
James L. Pinfold
For the ATLAS Hadronic Endcap Calorimeter Group:
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Hadronic Endcap CalorimeterLAr-Cu sampling calorimeter covering
1.5 < < 3.2
•GOOD HE JET RESOLUTION (10 of active cover.)
•FULL HEC+FCAL COVER (1-5-> 4.8) for good Etmiss determination.
•PUNCHTHROUGH TO –SYSTEM REDUCED by 11 thickness of HEC+support.
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Hadronic Endcap Calorimeter Construction: Responsibilities
• Absorber plate production:– Alberta– Dubna– Protvino
• Readout foils: – Mainz– TRIUMF
• EST boards – Lebedev
• Module stacking centres:– Dubna– MPI Munich– TRIUMF– Protvino
• Cold electronics (preamps) + cabling harness:– MPI Munich
• Calibration system:– KOSICE– Mainz
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Hadronic Endcap Segmentation
Front mod. 25 plates, rear mod. 17 platesFront mod. 25 plates, rear mod. 17 plates
•Composed of two wheels per end, 32 modules per wheel
– Front wheel 67 tonnes 25 mm Cu plates– Rear wheel 90 tonnes 50 mm Cu plates
•Channel count for both endcaps, 4416
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Cold Electronics
Connecting Bars
Tie Rods
Copper plates
EST boards
PAD boards
Honeycomb
HEC MODULE
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• Electrostatic Trans- former readout
• Distance between Cu plates 8.5 mm
• LAr gaps 1.954 mm
• Robust against HV shorts
HEC Readout
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Cu Absorber Plate Production• Three sites Alberta, Dubna, Protvino
• Roughly one sector(1/32nd) per month can be machined at Dubna & Protvino. Since June 1st 1999 2->3 per month can be machined at Alberta
• Estimate machining finished by early 2002.
• Eg Cu machining @ Alberta, using the CSR advanced machining facility:
http://129.128.162.80/webcam/JavaCam.html
See the machining in realtime moving images
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Series Production of Modules
• 1st module completed in Munich on 4/16/ 99.
Module under HV test at TRIUMF
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Quality Control
• Quality control procedures defined in October 1997, updated in November 1998.
• 2000 testbeam QC database started at CERN
• 2001-> merging of QC databases from CERN +institutes into LAr QC database.
Go-NoGo jigs
Cu density
checkTemplate check
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Cold Electronics
3 PSBs on back of each front module 2 PSBs on the back of each rear module
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Cold Testing
4 modules in cold test cryostat
Modules prepared for a cold test
(7 out of 8 modules will be cold tested)
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Test Beam Setup
Mating the modules Rotating to vertical
Modules in the cryostat
(1 in 8 modules will be beam tested)
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Air Pads
T6 Cryostat
Stacking & Insertion of HEC wheels into the Cryostat
Rotator
Stacking
Wheel
Crane
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Recent & Future Testbeam
Test-beam summer 2000 involving 6 series modules in the H6 beamline. Analysis of results recently accepted by NIM
Summer 2001– 2 successful test-beam periods .
H6 Joint EMEC-HEC test planned for the August of 2002. Using H1 cryostat deploy: 1) EMEC; 2) HEC FRONT; 3) HEC REAR (HALF DEPTH)
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Test Beam Results (1)Energy resolution for electrons
• Reported here are key results from the test of 6 series production HEC modules
• Results obtained in the summer of 2000
%0.20.3(GeV)E
0.2%21.4E
σ(E)
0
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Test Beam Results (2)• Spatial uniformity of response to electrons
as a variation of EM calib. Const. variation
Non-uniformity < 1%
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Test Beam Results (3)Energy resolution for pions
0.2)%(5.8(GeV)E
1.5)%(70.6E
σ(E)
0
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Testbeam Results(4) Muon Detection
• Using 150 GeV muons (most prob.
muon signal
0.030.020.93
EE
EE
μe
μdep.MC,
μvis
edep
evis
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Ratio of response to electrons and hadrons
)1(
1
00
0
0
Feh
FC
EC
E
E
E
E
E
E
E
eMC
MC
vis
e
evis
dep
vis
edep
evis
CMC is an energy dep. leakage correction1
1:)(ln: 00
m
scaleE
EFGroomGeVEkFWigmans
syst.0.1)0.01(stat.1.49h
eGroom
0.85m
00 )1()()( 00 EFFhEFeEEE hhvis
evisvis
Testbeam Results(5) e/h Ratio
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Final Remarks• Series production well underway 57%
(76/134) modules stacked – on schedule
• 42% (57/134) modules Cold Tested.
• All HEC only beam tests finished this summer!
• Joint EMEC-HEC test beam next summer.
• Joint EMEC-HEC-FCAL test in 2003
• Stand/Table/Rotator for installation ordered and due December 2001.
• Assembly area and clean rooms in Bat.180 ready.
• Assembly of the HEC will start in March 2003 in Bat. 180 at CERN.