ATLAS Forward Calorimeter Hadronic Test Beam Results
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Transcript of ATLAS Forward Calorimeter Hadronic Test Beam Results
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Calor2000 - 11 October 2000 Atlas FCAL - David Bailey 1
ATLAS Forward Calorimeter Hadronic Test Beam Results
J.Armitage, L.Babukhadia, D.Bailey, M.Dixit, M.Donkers, T.Embry, V.Epshteyn, P.Gravelle, J.Hamm, J.Kamnitzer, V.Khovanskii, D.Koolbeck, P.Loch, M.Losty,
J.Mayer, R.Mazini, G. Oakham, M.O’Neill, R.Orr, D.Paterson, J.Rutherfoord, M.Ryabinin, A.Savine, J.Seeley, P.Shatalov, L.Shaver, M.Shupe, G.Stairs,
D.Tompkins, W.Trischuk, K.Vincent, D. Waller, V.Zeyteev
Arizona - CRPP Carleton - ITEP - Montreal - Toronto
See also talks by• R.Mazini & P.Loch: Comparison of electron data with GEANT3 and GEANT4
• A.Savine: Hadronic energy resolution improvement using transverse information
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ATLAS Forward Calorimeter
=3.2
=4.9
FCAL
σ ET
( )
ET
≤ 1 0 %
•Tag forward jets
•Measure missing ET
~ 40Mhz
~ 108 GeV/cm2/s at =4.5
~ 10 106 6 Gy/year
~ 100 Watts absorbed
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FCAL 1
- Cu matrix + rods
- 2.6 , 28X0 , 2.1 t
FCAL 2 FCAL 3
- W matrix + rods, Cu tubes
- each ~ 3.7 , 90 X0 , 4 t
Metal absorber / Liquid Argon with rod anodes in longitudinal channels
45 cm
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FCAL1 Anode Structure
FCAL End View
Anode Spacing (FCAL1/2/3)
• 7.5 / 8.18 / 9.00 mm
Liquid Argon gap
• 250 / 375 / 500 m
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FCAL2 Endplates and inner absorber
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Tube and slug matrix
Cutaway demonstration of matrix
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Powder
•97% W
Binder
•2% Ni
• 1% Fe
Tungsten slugs
100 µm
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FCAL Module-0‘s under
construction
FCAL2
FCAL1
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Beam20-200 GeV
e, π, µ
MWPCs in front of cryostat, tailcatcher and muon tagger behind
Module-0 beam setup at CERN
FCAL1
FCAL2
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Beam test resultsBeam test results
• FCAL modules work very wellFCAL modules work very well
–Good resolution, linearityGood resolution, linearity
• Metals conduct electricity very wellMetals conduct electricity very well
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Parts cleaned by• degreasing solvent• ultrasound in hot alkaline detergent• ultrasound in hot acidic cleaning solution• high pressure rinses• assembled in Clean room• module HV tested
Swab tests of inside of tubes
Before After
BUT ...
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On arrival at CERN from Canada, there were about 1% shorted (but repairable) anodes
Metal shards shaken loose during transport.e.g. from swaging (attaching) tubes to endplates.
Inside of swaged tube
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Shipping Test of 1000 tube test moduleShipping Test of 1000 tube test module
Module driven for 3 Module driven for 3 hours:hours:
1.5 hours on highway1.5 hours on highway
1.5 hours on 1.5 hours on very roughvery rough unpaved Canadian back unpaved Canadian back roadsroads
Crate not fixed to Crate not fixed to truck, so it could truck, so it could bounce and move.bounce and move.
Module tested at 800 V after trip: no breakdownsModule tested at 800 V after trip: no breakdowns
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0%
5%
10%
15%
20%
25%
30%
00.050.10.150.20.25
σ(E)E
GeV( )−0.5Ebeam( )−0.5
20 200 GeVEbeam 40 8060 120
• FCAL energy
(using radius weighting)* conventional Erec
* See talk by A.Savine
0.25 0.20 0.15 0.10 0.05 0
σ(Erec)Erec
=81%
E⊕2.7%
Energy Resolution
σ ( Er e c
)
Er e c
=
8 1 %
E
⊕ 2 . 7 %
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0
50
100
150
200
250
0 50 100 150 200 250
Erec
Ebeam (GeV)
Reconstructed energy in FCAL vs pion beam energy
0.95
0.96
0.97
0.98
0.99
1
1.01
0 50 100 150 200 250
ErecEbeam
Ebeam (GeV)
FCAL Hadronic Linearity
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ConclusionsConclusions
• ATLAS FCAL module-0 beam test very ATLAS FCAL module-0 beam test very successfulsuccessful
• ATLAS FCAL technology meets design ATLAS FCAL technology meets design requirementsrequirements
• Test has lead to improved construction and Test has lead to improved construction and reconstruction methodsreconstruction methods