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Calor2000 - 11 October 2000 Atlas FCAL - David Bailey 1
ATLAS Forward Calorimeter Hadronic Test Beam Results
• Metals conduct electricity very wellMetals conduct electricity very well
Calor2000 - 11 October 2000 Atlas FCAL - David Bailey 11
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 ...
Calor2000 - 11 October 2000 Atlas FCAL - David Bailey 12
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
Calor2000 - 11 October 2000 Atlas FCAL - David Bailey 13
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
Calor2000 - 11 October 2000 Atlas FCAL - David Bailey 14
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 %
Calor2000 - 11 October 2000 Atlas FCAL - David Bailey 15
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
Calor2000 - 11 October 2000 Atlas FCAL - David Bailey 16
ConclusionsConclusions
• ATLAS FCAL module-0 beam test very ATLAS FCAL module-0 beam test very successfulsuccessful