Peilong Wang Southern Methodist University For PHYS 5380 Fall 2014 Outline Physics requirements for the ATLAS LAr Calorimeter Structure of the ATLAS LAr Calorimeters Electromagnetic Calorimeters ID: 213578
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Slide1
The ATLAS Liquid Argon Calorimeter
Peilong Wang, Southern Methodist UniversityFor PHYS 5380 Fall 2014Slide2
Outline
Physics requirements for the ATLAS
LAr
Calorimeter
Structure of the ATLAS
LAr CalorimetersElectromagnetic CalorimetersElectromagnetic Barrel Calorimeter (EMB)Electromagnetic End-cap Calorimeter (EMEC)Hadronic End-cap Calorimeters (HEC)Forward Calorimeters (FCal)Readout Electronics for the LAr CalorimeterPerformance of the ATLAS LAr Calorimter
2Slide3
Physics Requirements for the LAr Calorimeter
Driven by the potential production of the Higgs boson
Potential d
ecay
channels:
H → ϒϒ, H → 4e±…Dynamic range: 30 MeV -- 3 TeVEnergy resolution:
⊕0.7%
Linearity: 0.1
%
3
Decided by the type of the collision
statistical error ⊕ systematic error
the detector’s response to the particle’s energySlide4
Structure of the ATLAS LAr Calorimeter
4Slide5
Electromagnetic Barrel Calorimeter (EMB)
5
Cu electrode
Honeycomb
spacer
Pb
absorber clad in stainless steelSlide6
Sampling calorimeter & Accordion structure
6
Absorber layer
Active layer
An incoming particle loses its energy in the absorber layers, initiating a shower of secondary particles
.
The active layer collects the deposited energy.Slide7
7
Electromagnetic End-cap Calorimeters (EMEC)
EMECSlide8
Hadronic End-cap Calorimeter (HEC)
8
HECSlide9
Three modules: 1 EM (copper), 2Hadronic (tungsten).
Forward Calorimeters (FCal)
9Slide10
10
How the ATLAS
LAr
Calorimeter worksSlide11
Readout Electronics for the LAr Calorimeter
11
Pileup noise
Thermal noise
Bipolar signal
Shaping timeSlide12
The
LAr Calorimeter is well running at CERN now.The resolution and stability is demonstrated to be pretty good while runningThe proton and electron identification remains good when the number of the reconstructed primary
vetices
increasing
Based on the great performance, the Higgs-like boson is discovered
Performance of the ATLAS LAr Calorimeter 12Slide13
Thank you!
Reference:ATLAS LArg Collaboration,
“The
ATLAS Liquid Argon Calorimeter: an
overview,”
J. Phys.: Conf. Ser. 160 012043, 2009 ATLAS Collaboration, “Performance of the ATLAS Liquid Argon Calorimeter after Three Years of LHC Operation and Plans for a Future Upgrade,” arXiv:1306.6756R D Schaffer, “Pedagocial Lectures on Detection of Electromagnetic Interactions,” SMU, Oct. 28, 2014
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