The ATLAS Liquid Argon (LAr) calorimeter system, operational since August 2006, has been carefully commissioned and checked using collision data as well as single beam data and cosmic data taken previously.

ATLAS liquid-argon calorimeter : Technical Design Report: Corporate author(s) CERN. Geneva. LHC Experiments Committee ; LHCC: Collaboration ATLAS Collaboration: Publication Geneva : CERN, 1996 - 606. Series (Technical design report. ATLAS; 2) …

The ATLAS ECAL 15 Sampling Pb/LAr calorimeter with innovative “accordion” geometry Longitudinal dimension ~25 X0, 47 cm (vs 22 cm for CMS) ~170 000 channels Usage of Liquid Argon Radiation Hard High number of electron-ion pair produced by ionization (1 GeV deposit -> 5.106 e-) Stable vs time BUT: • Need a cryostat (90K)

The Liquid Argon (LAr) Calorimeter surrounds the ATLAS Inner Detector and measures the energy of electrons, photons and hadrons. It features layers of metal (either tungsten, copper or lead) that absorb incoming particles, converting them into a …

In General, the ATLAS EM calorimeters should be designed to trigger on and to provide very good electromagnetic measurements and identification of electrons and photons. ~ 20 000 m2 of honeycomb spacers to maintain flexible electrodes centered in the …

Apr 10, 2025 · ATLAS Experiment. Exploring the secrets of the Universe. Latest News Exploring the W boson at extreme mass scales . Physics Briefing | 15 April 2025. ATLAS Highlights from Quark Matter 2025. News | 14 April 2025. ATLAS gets under the hood of the Higgs mechanism. Press Statement | 10 April 2025.

Efficient tracking for lepton momentum measurement; enhance e/γ identification; excellent b tagging capability at low luminosity. Very good electromagnetic calorimeter for e/γ identification,...

Discussed ATLAS and CMS calorimeters → Design, performance and calibration Used H → as a benchmark discovery to compare the calorimeter performance in the experiments and impact on the result Calorimeters from both experiments perform …

The energies of electrons and photons are measured using the CMS electromagnetic calorimeter (ECAL). Measuring their energies with the necessary precision in the very strict conditions of the LHC - a high magnetic field, high levels of radiation, and only 25 nanoseconds between collisions - requires dedicated detector materials.

Jan 25, 2022 · The ATLAS Collaboration has completed the installation of “Phase-I” upgrades of the Liquid Argon Calorimeter (LAr). The upgrades improve the read-out speed of the calorimeter’s electronics and provide more efficient event-selection capabilities.