Hidden Valley Higgs Decays in the ATLAS detector The ATLAS Collaboration
The ATLAS Detector at the Large Hadron Colliderkrieger/talks/CAP2004.pdf · The ATLAS Detector at...
Transcript of The ATLAS Detector at the Large Hadron Colliderkrieger/talks/CAP2004.pdf · The ATLAS Detector at...
The ATLAS Detector at the Large Hadron Collider
Peter Krieger IPP/University of Toronto
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 2
The ATLAS Detector at the Large Hadron Collider
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The ATLAS Canada Collaboration
Alberta Carleton Montreal Simon Fraser Toronto TRIUMF UBC Victoria York
32 University/Lab Physicists 80 People, including engineers, technicians and students
Educational Role20 Undergraduate students 25 Graduate Students 16 Postdocs
this talk + calorimeter testbeamsOther Important Activities
Radiation Hardness Studies
Physics Studies
Event Filter Processor Farm
ATLAS Computing
Pixel Testing and Assembly
Focus on Liquid Argon Calorimetry
Four NSERC funded projects:
Hadronic Endcap Calorimeter
Hadronic Forward Calorimeter
Endcap Signal Cryogenic Feedthroughs
Front-End Board Electronics
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ATLAS Canada NSERC-funded Construction Projects
Cryogenic feedthroughs
Hadronic Endcap Calorimeter Wheels
Hadronic Forward Calorimeter Modules
Liquid Argon Front-End Electronics
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The Large Hadron Collider at CERN
proton-proton collider being installed in existing 27km circumference LEP ring at CERN in Geneva Switzerland
pp centre-of-mass energy of 14 TeV
constituent centre-of-mass energies ~ 1-2 TeVL = 1033 cm-2/s (low luminosity)
1034 cm-2/s (high luminosity)
proton bunch spacing of 25 ns (40 MHz collision frequency)
Physics Goals: whatever TeV scale physics is there to be discovered
• Higgs boson
• Supersymmetry
• Large extra dimensions
• Extended gauge theories
• Compositeness
• B Physics (oscillations, CP violation)
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The Large Hadron Collider at CERN
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The ATLAS Cavern
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The ATLAS Cavern, 1 Year Ago Today
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The ATLAS Cavern June 7, 2004
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The ATLAS Calorimeters
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ATLAS Barrel Cryostat: Solenoid Insertion
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Endcap Signal Cryogenic FeedthroughsATLAS liquid argon calorimetry has over 180k signal channels which must come through the walls of the cryostats
Each feedthrough unit carries 1920 electrical channels.
Barrel: 64 feedthrough units (+spares)
Endcap: 50 feedthrough units total (+5 spares)
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Feedthrough Installation and Testing Complete
Feedthrough construction in Victoria completed October 2002
Endcap C feedthrough installation completed January 2003
Endcap C cabling and electrical testing completed April 2003
Endcap A feedthrough installation completed Sept 2003
Endcap A warm cabling and electrical testing completed October 2003
Endcap A: all feedthroughs welded 26/09/03 Endcap A feedthrough electrical testing
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Liquid Argon FEB Electronics
ATLAS Canada responsibilties:
All Switched Capacitor Array Controllers
All other deep sub-micron chips
gain-selectors
clock fanout
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Liquid Argon FEB Electronics
SCA Controller
SCA
All chips have been delivered and await FEB construction:
To start ~ July 2004
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HEC Module Production
HEC Module Production
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Date
Mod
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Finished at InstitutesCold testedProjected FinishedProjected Cold Tested
32 modules / wheel
Module Production CompletedColdtesting completed Fall 2003 HEC Wheel construction completedConstruction of special modules for combined testbeam completed
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HEC Wheel Assembly Procedure
Wheel assembly on Assembly Table
Wheel rotation with Rotator
Wheel Storage on T6/T6A
Wheel Insertion into Endcap Cryostat
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HEC 1C and 2C Modules on T6A Tooling
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HEC Insertion Endcap C
HEC wheel 1 insertion HEC wheel 2 insertion
EMEC
HEC1
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The Endcap Calorimeter System
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20
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50
60
350 400 450 500 550 600 650
Z [cm]
R [c
m]
FCal I FCal II FCal III(elm) (had) (had)
elm EndCap
had EndCap had EndCap(front) (back)
Poly sh
ield
pumps
Cu sh
ieldin
g
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Endcap C Forward Calorimeter
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FCal Insertion Into Endcap Cryostat
cryostat cold cover
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Forward Calorimeter Construction Status
FCal module construction completed May 2003
FCal calibration testbeam (using C end modules) Summer 2003
FCal C final assembly completed Fall 2003
FCal C integration into Endcap C cryostat scheduled for later this year
FCal A module coldtesting completed January 2004
FCal A final assembly scheduled for later this year
FCal Module0 refurbishing for endcap combined testbeam finished Fall 2003
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Module Alignment: FCalC Final Assembly
FCal1 FCal2 FCal3
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FCalC Prior to Cable Dressing
Brass Plug Shielding
FCal support tube
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FCalC Cold-cable Dressing
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FCalC Cold-cable dressing
FCal1FCal2 FCal3
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FCal Cable Dressing Nears Completion
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FCal Kapton Wrap / Ready for Insertion
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Insertion into Cold Tube Begins
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Insertion Almost Complete (3cm left)
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Endcap C Forward Calorimeter
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Liquid Argon Calorimeter Testbeams
Measure initial ATLAS calibration constantsessential for good “day 1” performance
often superceded later (usually requires tracking information)
no tracking in front of FCal, so testbeam calibration particularly important
Calibration “crack” region (transition from EMEC/HEC to FCal: η ≈ 3.2
Important for understanding calorimeter intercalibrations (energy sharing)
Important for dead-material corrections (tune MC using testbeam data)
HEC/EMEC Combined Testbeam 2002 FCAL Calibration Testbeam 2003HEC/EMEC/FCal Combined Testbeam 2004
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HEC/EMEC Combined Testbeam 2002
(GeV)beamE0 50 100 150 200
(GeV)beamE0 50 100 150 200
reco
) / E
reco
’(E
σ
0.050.060.07
0.1
0.2
0.3
0.40.5 -πData
+πData
Geant3
G4 LHEPG4 QGSP
EMECHEC1
HEC2
NIM Draft exists
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FCal Calibration Testbeam Summer 2003
0°1°2°3°4°
Cryostat Rotation: 0°Placement:2.5° rotation, 100mm offset
Impact angle: 2.5°
H1 cryostat in H6 beamline at CERN
e, π, μ 10-200 GeV from CERN SPS
Impact angles adjusted to simulate beam from interaction point
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Module Package Orientation for Calibration Testbeam
Evacuated “beam pipe”
FCal1 FCal2 FCal3
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FCal Package for Calibration Testbeam
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Forward Calorimeter Calibration Testbeam
FCAL1 FCAL2 FCAL3
7 pigtails4 regular SBs3 special SBs 3 special SBs
2 regular SBs5 pigtails
4 regular SBs4 pigtails
Not enough cable harnesses / electronics available for readout of all channels.
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FCal Calibration Testbeam Beam Impact Positions
Beam spots for edge scan (only at 200 GeV)
Simulated cryostat bulkheadBeam hole
Beam spots for calibration (energy scan)
FCal outer edge
Energy Scan Data Points
5 GeV electrons
10 GeV electrons, pions
20 GeV electrons, pions
40 GeV electrons, pions
60 GeV electrons, pions
80 GeV electrons, pions
100 GeV electrons, pions
150 GeV electrons, pions
200 GeV electrons, pions, µ
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Forward Calorimeter/electron event display
FCal1 : Single electron 200 GeV/c
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FCal1
FCal2
FCal3
Energy Deposits in FCal1, 2, and 3 due to 200 GeV π’s
Accumulated over multiple π events
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Energy reconstruction for electronsEnergy reconstruction for electrons:
• Sum over whole calorimeter (add noise from channels with no signal)
• Sum over channels within some radius of a seed channel
193.1 GeV
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FCal Electron Response 10, 20 and 40 GeV
Beam particle selection criteria (here to eliminate pions) preliminary
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Electron and pion linearity: Very Preliminary……..Electrons and Pions at Position 4L - Fit Electrons
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FCal Calibration Testbeam: Electron Energy Resolution
E (GeV)
σ/E
(%)
= ⊕ ⊕b cσ/E a
EE
a=(3.76±0.06)%, b=(24.5±0.84)√GeV %, c=(145.5±1.6) GeV%
Analysis of pion results in progress
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Endcap Combined Testbeam HEC/EMEC/FCal
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10
20
30
40
50
60
350 400 450 500 550 600 650
Z [cm]
R [c
m]
FCal I FCal II FCal III(elm) (had) (had)
elm EndCap
had EndCap had EndCap(front) (back)
Poly sh
ield
pumps
Cu sh
ieldin
g
η=3.2
Intercalibration of endcap calorimeters
Corrections for energy losses in dead material (tune simulation to testbeam results)
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HEC/EMEC FCAL Combined Testbeam
EMEC+HEC+FCAL Setup Material studies
Cold tailcatcher
Special HEC mini-ModulesEMEC Mod0
FCal1/2 Mod0
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Set-up for η=3.2 Beam Test
Lifting Tool for Complete Setup
Lifting Tool for HEC1 or HEC2
EMEC
FCAL
FCAL Frame
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Endcap Combined Testbeam Setup
Front-End Crate
Cold Tailcatcher
simulated FCalcoldtube wall
feedthrough
H1 cryostat
FCal1, FCal2, EMEC Modules not visible
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Summary• ATLAS Canada construction projects nearing successful completion
– Hadronic Endcap Calorimeter– Hadronic Forward Calorimeter– Liquid Argon Cryogenic Signal Feedthroughs– Liquid Argon Front-End Electronics
• Other efforts underway– Event Filter– ATLAS computing / Data challenges – Radiation Studies– ATLAS pixels
• Detector integration / installation is proceeding well
• Testbeam programs have been very successful– NIM draft of 2002 testbeam (HEC/EMEC) exists– Analysis of FCal calibration testbeam data analysis continues– Combined testbeam currently underway
…… and of course we all look forward to first data taking in 2007 !