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Introduction Construction and integration status Performances Conclusion

Atlas liquid argon calorimeter status E. Monnier on behalf of the Atlas liquid argon calorimeter group. Introduction Construction and integration status Performances Conclusion. Design performances. Benchmark channels: H→  , H→4e, W’, Z’ … + running conditions  Design requirements:

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Introduction Construction and integration status Performances Conclusion

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  1. Atlas liquid argon calorimeter statusE. Monnieron behalf of the Atlas liquid argon calorimeter group • Introduction • Construction and integration status • Performances • Conclusion E. Monnier - CPPM - ICHEP04 - Beijing

  2. Design performances Benchmark channels: H→, H→4e, W’, Z’… + running conditions  Design requirements: • energy resolution and uniformity σ/E = 10%/√E ⊕ 0.7% for e,  σ/E = 50(100)%/√E ⊕ 3(10)% for jet |η|<3 (3<|η|<5) • Angular resolution: 50 mrad/√E for e,  • Linearity of 0.1% for e,  and <2% for hadronic • Particle id and separation: e, jets, , π0 • Dynamic range 20 MeV to a few TeV • Time measurements, Hermiticity, Radiation…. E. Monnier - CPPM - ICHEP04 - Beijing

  3. EM Endcap Ps |η|<1.8 EM Barrel+Ps Hadronic Endcap Forward The Atlas larg calorimeters • Em barrel |η|<1.475 (Pb/Lar) • Em endcap 1.375<|η|<3.2 (Pb/Lar) • Hadronic endcap 1.5<|η|<3.2 (Cu/Lar) • Forward 3.2<|η|<4.9 (Cu, W/Lar) > 200000 channels E. Monnier - CPPM - ICHEP04 - Beijing

  4. e EM Barrel 32 Modules cold tested and integrated MC Barrel Closed cooled down • <0.014% dead channels ! • 0.1% HV ½ gap isolated • Barrel at LArg temperature • Under extensive test • In the pit early October E. Monnier - CPPM - ICHEP04 - Beijing

  5. Endcap: EM 1/4 8 Modules cold tested and integrated Per wheel ! E. Monnier - CPPM - ICHEP04 - Beijing

  6. Space to insert Fcal Hec2, Hec1, Emec Endcap: HEC 2/4 32 Modules cold tested and integrated Per wheel (2x2) E. Monnier - CPPM - ICHEP04 - Beijing

  7. Endcap: FCAL 3/4 3 Modules cold tested and integrated per wheel Cu (em) W (had) E. Monnier - CPPM - ICHEP04 - Beijing

  8. Endcap 4/4 • EC C, Em+Had+Fcal integrated • Closed and ready for cold test • EC A, Em integrated, Had under integration, Fcal ready for integration • Em: <0.005% dead channels and 0.1% HV ½ gap isolated • Hec: 0.03 % dead channels and 0.14% HV gap isolated • Fcal: 0.03, 0.17 and 0.55 % of HV Rod isolated Calorimeter system moving toward commissioning phase !! E. Monnier - CPPM - ICHEP04 - Beijing

  9. Beam test Performances • 4 barrel and 3 endcap EM production modules tested • 24 HEC prod modules tested (3 frt+3 rear/test) • Fcal-C tested • HEC/EMEC combined test EM Barrel EM End-cap EMEC/HEC E. Monnier - CPPM - ICHEP04 - Beijing

  10. Normalized to 100 GeV η=0.7 9.4% /E0.1% Energy resolution Linearity (Erec/Ebeam) Beam energy (GeV) Beam energy (GeV) EM linearity and energy resolution • Linearity within ±0.25 (0.1)% for E>10 (40) GeV • Energy resolution within spec and MC agreement E. Monnier - CPPM - ICHEP04 - Beijing

  11. EM Uniformity Barrel EndCap Energy (GeV) η (middle) Energy (GeV) Global constant term within spec (0.7%) E. Monnier - CPPM - ICHEP04 - Beijing

  12. Position and angular resolution 245 GeV e ~550 mm at =0 resolution ( units x 1000) ~250 mm at =0 sZ~20mm Barrel  55 mrad/√E sθ(mrad) x √E within spec Endcap ~1.7 sZ~5mm Barrel 20 100 150 Energy (GeV)  E. Monnier - CPPM - ICHEP04 - Beijing

  13. Barrel Time resolution (ps) Cell energy (GeV) Time measurement • Fast signal in Argon  accurate time measurement • Zvertex measurement, long lived particle id,… • Front end electronic very low constant term < 20ps • 70ps constant term within spec (100ps) E. Monnier - CPPM - ICHEP04 - Beijing

  14. Endcap  Muon measurements • Muon signal large enough in middle layer but also seen in strips: • S/N = 7 Endcap S2 • S/N = 7-10 in Barrel S2 • Seen also in HEC Barrel Powerful tool for commissioning: intercalibration (1ns), position (0.5mm EM, mms HEC), uniformity (<3‰ EM, 1% HEC) … E. Monnier - CPPM - ICHEP04 - Beijing

  15. (84.1  0.3)% /E Emec/Hec combined test • Emec + Hec (3frt+2rear), non pointing geometry • Study 1.6<||<1.8  calibration constants for atlas • e/h compensation: weighting of em cluster energy • MC validation: room for improvement E. Monnier - CPPM - ICHEP04 - Beijing

  16. a=(3.760.06)% b=(24.50.84)GeV % c=(145.51.6) GeV% σ/E (%) E (GeV) Fcal calibration run Electron energy resolution • FCAL energy calibration • Edge scan at high || + HV test E. Monnier - CPPM - ICHEP04 - Beijing

  17. MDT-RPC HEC front Warm TC Tilecal HEC rear EMEC TRT LAr FCAL 2 FCAL 1 Cold TC 2004 beam tests (the last before LHC) Combined tests with “final” atlas setup and readout • Barrel: Tracker, EM, hadronic calo, Muons system • End-cap: EM, HEC, FCAL • Tuning ATLAS hardware, online and offline software, calibration… E. Monnier - CPPM - ICHEP04 - Beijing

  18. 1 March 2004 Next April 2004 2005: EC cryostats… October 2004 2005: Install electronics E. Monnier - CPPM - ICHEP04 - Beijing

  19. Conclusions • Larg calorimeter system in its final integration stage before installation in the pit: October for barrel • Beam tests have exhibited required performances • Combined 2004 beam test with final ATLAS readout system ongoing successfully • Readout electronic under production • Commissioning phase will start next year But still a lot of work and understanding of the system to be ready for first data in 2007 E. Monnier - CPPM - ICHEP04 - Beijing

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