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.