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The ATLAS Liquid Argon Calorimeter The ATLAS Liquid Argon Calorimeter

The ATLAS Liquid Argon Calorimeter - PowerPoint Presentation

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The ATLAS Liquid Argon Calorimeter - PPT Presentation

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

atlas calorimeter cap lar calorimeter atlas lar cap calorimeters electromagnetic absorber emec energy hec performance layer argon liquid active

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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

13Slide14

Back up

14