Construction, assembly and tests of the ATLAS electromagnetic barrel calorimeter

Aubert, B.; Beaugiraud, B.; Colás, J.; Delebecque, P.; Ciaccio, L. Di; Kacimi, M. El; Ghez, Ph.; Girard, C.; Gouanère, M.; Goujdami, D.; Jérémie, A.; Jézéquel, S.; Lafaye, R.; Massol, N.; Perrodo, P.; Przysiezniak, H.; Sauvage, G.; Thion, J.; Wingerter-Seez, I.; Zitoun, R.; Zolnierowski, Y.; Alforque, R.; Chen, H.; Farrell, J.; Gordon, H. A.; Grandinetti, R.; Hackenburg, R.; Hoffmann, A.; Kierstead, J.; Koehler, Juergen; Lanni, F.; Lissauer, D.; Ma, H.; Makowiecki, D.; Müller, Th.; Norton, Simon; Radeka, V.; Rahm, D.; Rehak, M.; Rajagopalan, S.; Rescia, S.; Sexton, K.; Sondericker, J.; Stumer, I.; Takai, H.; Belymam, A.; Benchekroun, D.; Driouichi, C.; Hoummada, A.; Hakimi, M.; Knee, M.; Stroynowski, R.; Wakeland, B.E.; Datskov, V.; Drobin, V.M.; Aleksa, M.; Bremer, J.; Carli, T.; Chalifour, M.; Chevalley, J.L.; Djama, F.; Ema, L.; Fabre, C.; Fassnacht, P.; Gianotti, F.; Gonidec, A.; Hansen, J. B.; Hervás, L.; Hott, T.; Lacaste, C.; Marin, C.P.; Pailler, P.; Pleskatch, A.; Sauvage, D.; Vandoni, G.; Vuillemin, V.; Wilkens, H. G.; Albrand, S.; Belhorma, B.; Collot, J.; Saintignon, P. de; Dzahini, D.; Ferrari, A.; Fulachier, J; Gallin-Martel, M.-L.; Hostachy, Jean-Yves; Laborie, G.; Ledroit-Guillon, F.; Martin, Ph.; Muraz, J.F.; Ohlsson-Malek, F.; Saboumazrag, S.; Viret, S.; Othegraven, Rainer; Zeitnitz, C.; Bànfi, D.; Carminati, L.; Cavalli, D.; Citterio, M.; Costa, G.; Delmastro, M.; Fanti, M.; Mandelli, L.; Mazzanti, M.; Tartarelli, Francesco; Augé, E.; Baffioni, S.; Bonis, J.; Bonivento, W.; Bourdarios, C.; Taille, C. de la; Fayard, L.; Fournier, D.; Guilhem, G.; Imbert, Pierre; Iconomidou-Fayard, L.; Meur, G. Le; Mencik, M.; Noppe, J.M.; Parrour, G.; Puzo, P.; Rousseau, D.; Schaffer, A. C.; Seguin-Moreau, N.; Serin, L.; Unal, G.; Veillet, J. J.; Wicek, F.; Zerwas, D.; Astesan, F.; Bertoli, W.; Canton, B.; Fleuret, F.; Imbault, D.; Lacour, D.; Laforge, B.; Schwemling, Ph.; Abouelouafa, E.M.; Mansour, A. Ben; Cherkaoui, R.; Mouahhidi, Y. El; Ghazlane, H.; Idrissi, A.; Bazizi, K.; England, D.; Glebov, V. Yu.; Haelen, T.; Lobkowicz, F.; Slattery, P.; Belorgey, J.; Besson, N.; Boonekamp, M.; Durand, Dominique; Ernwein, J.; Mansoulié, B.; Molinié, F.; Meyer, J.; Perrin, Patrick; Schwindling, J.; Taguet, J.P.; Zaccone, H.; Lund‐Jensen, B.; Rydström, Stefan; Tayalati, Y.; Botchev, B.; Finocchiaro, G.; Hoffman, J.; McCarthy, R. L.; Rijssenbeek, M.; Steffens, J.; Zdrazil, M.; Braun, H. M.

doi:10.1016/j.nima.2005.11.212

Cited by 76 publications

(42 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ATLAS 'accordion' calorimeter [3,19], illustrated in figure 5, was first proposed in 1990 and took 15 years to bring to fruition. It has the advantages of linear response, being very stable and intrinsically radiation hard (owing to the noble gas active medium), having a Moliere radius (approx.…”

Section: Electromagnetic Calorimetersmentioning

confidence: 99%

Technical challenges of the Large Hadron Collider experiments (ATLAS and CMS)

Ball

2015

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

This review article introduces the design of the general purpose experiments ATLAS and CMS, which independently discovered the Higgs boson, showing how generic features are motivated by the characteristics needed to explore the physics landscape made accessible by the Large Hadron Collider accelerator, whose high collision rate creates an extremely challenging operating environment for instrumentation. Examples of the very different component designs chosen by the two experiment collaborations are highlighted, as an introduction to briefly describing techniques used in the construction of some of these elements and, subsequently, in the assembly of both detection systems in their respective underground caverns.

show abstract

Section: Electromagnetic Calorimetersmentioning

confidence: 99%

Technical challenges of the Large Hadron Collider experiments (ATLAS and CMS)

Ball

2015

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

show abstract

“…Using the relation between the drift time and the gap from (10) and the fact that the signal amplitude is proportional to the initial ionization current (I ρ·w gap T drift w −α gap where ρ is the linear density of charge), one can relate the relative variation of the drift time to the one of the amplitude applying a factor α/(1 + α) to the above result. Therefore, the drift time uniformity leads to a dispersion of response due to the barrel calorimeter gap variations of (0.29 For comparison, during the EM calorimeter barrel module construction, the LAr gap thickness was measured, yielding an estimate of the constant term due to gap size variations of c gap = 0.16% [14]. The measurement of the gap size uniformity presented here takes into account further effects like deformations in the assembled wheels and possible systematic uncertainties from the in situ cosmic muon analysis.…”

Section: Impact On the Global Energy Resolution Constant Term Of The mentioning

confidence: 99%

Readiness of the ATLAS liquid argon calorimeter for LHC collisions

Aad¹,

Abbott²,

Abdallah³

et al. 2010

Eur. Phys. J. C

Self Cite

View full text Add to dashboard Cite

The ATLAS liquid argon calorimeter has been operating continuously since August 2006. At this time, only part of the calorimeter was readout, but since the beginning of 2008, all calorimeter cells have been connected to the ATLAS readout system in preparation for LHC collisions. This paper gives an overview of the liquid argon calorimeter performance measured in situ with random triggers, calibration data, cosmic muons, and LHC beam splash events. Results on the detector operation, timing perfore-mail: atlas.secretariat@cern.ch mance, electronics noise, and gain stability are presented. High energy deposits from radiative cosmic muons and beam splash events allow to check the intrinsic constant term of the energy resolution. The uniformity of the electromagnetic barrel calorimeter response along η (averaged over φ) is measured at the percent level using minimum ionizing cosmic muons. Finally, studies of electromagnetic showers from radiative muons have been used to cross-check the Monte Carlo simulation. The performance results obtained using the ATLAS readout, data acquisition, and reconstruction software indicate that the liquid argon calorimeter is well-prepared for collisions at the dawn of the LHC era.

show abstract

“…An extensive description of the electromagnetic barrel calorimeter and its modules can be found in [16]. The electromagnetic barrel is a lead/LAr sampling calorimeter and is longitudinally segmented into three layers 6 (strip, middle and back layer), each having different longitudinal thickness and transverse segmentation into read-out cells with the following granularity (see figure 3): the strip layer is finely segmented in pseudorapidity 7 η with a granularity of 0.025/8 η-units, but has only four subdivisions in φ per module and hence a granularity of 2π/64; 5 In ATLAS, the TRT detector is inside the solenoidal field.…”

Section: Sub-detectors Geometry and Granularitymentioning

confidence: 99%

“…The separation between electrons and hadrons, mostly pions 16 presented in the following is based primarily on the HT information while the ToT information provides secondary separation most notably at lower energies. The optimization has been done to maximize the pion rejection (defined as R π = 1/ε π , where ε π is the pion efficiency) at 90% electron efficiency.…”

Section: Introduction To Particle Identification With the Transition mentioning

confidence: 99%

Combined performance studies for electrons at the 2004 ATLAS combined test-beam

Abat¹,

Abdallah²,

Addy³

et al. 2010

J. Inst.

View full text Add to dashboard Cite

In 2004 at the ATLAS (A Toroidal LHC ApparatuS) combined test beam, one slice of the ATLAS barrel detector (including an Inner Detector set-up and the Liquid Argon calorimeter) was exposed to particles from the H8 SPS beam line at CERN. It was the first occasion to test the combined electron performance of ATLAS. This paper presents results obtained for the momentum measurement p with the Inner Detector and for the performance of the electron measurement with the LAr calorimeter (energy E linearity and resolution) in the presence of a magnetic field in the Inner Detector for momenta ranging from 20 GeV/c to 100 GeV/c. Furthermore the particle identification capabilities of the Transition Radiation Tracker, Bremsstrahlungs-recovery algorithms relying on the LAr calorimeter and results obtained for the E/p ratio and a way how to extract scale parameters will be discussed.

show abstract

Construction, assembly and tests of the ATLAS electromagnetic barrel calorimeter

Abstract: The construction and assembly of the two half barrels of the ATLAS central electromagnetic calorimeter and their insertion into the barrel cryostat are described. The results of the qualification tests of the calorimeter before installation in the LHC ATLAS pit are given

Cited by 76 publications

References 11 publications

Technical challenges of the Large Hadron Collider experiments (ATLAS and CMS)

Technical challenges of the Large Hadron Collider experiments (ATLAS and CMS)

Readiness of the ATLAS liquid argon calorimeter for LHC collisions

Combined performance studies for electrons at the 2004 ATLAS combined test-beam

Contact Info

Product

Resources

About