calor2000 - 11 october 2000 atlas fcal - david bailey 1 atlas forward calorimeter hadronic test beam...

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


ATLAS Forward Calorimeter

=3.2

=4.9

FCAL

σ E T

( )

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


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


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


FCAL2 Endplates and inner absorber


Tube and slug matrix

Cutaway demonstration of matrix


Powder•97% W

Binder•2% Ni• 1% Fe

Tungsten slugs

100 µm


FCAL Module-0‘s under

construction

FCAL2

FCAL1


Beam20-200 GeV

e, π, µ

MWPCs in front of cryostat, tailcatcher and muon tagger behind

Module-0 beam setup at CERN

FCAL1

FCAL2


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


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 ...


On arrival at CERN from Canada, there were about 1% shorted (but repairable) anodesMetal shards shaken loose during transport.e.g. from swaging (attaching) tubes to endplates.

Inside of swaged tube


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


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 %


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


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

calor2000 - 11 october 2000 atlas fcal - david bailey 1 atlas forward calorimeter hadronic test beam...

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