8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing1 Atlas liquid argon calorimeter status E. Monnier on behalf of the Atlas liquid argon calorimeter group.

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Presentation transcript:

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing1 Atlas liquid argon calorimeter status E. Monnier on behalf of the Atlas liquid argon calorimeter group Introduction Construction and integration status Performances Conclusion

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing2 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, , π 0 Dynamic range 20 MeV to a few TeV Time measurements, Hermiticity, Radiation….

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing3 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) > channels

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing4 32 Modules cold tested and integrated EM Barrel Barrel Closed cooled down MC e <0.014% dead channels ! 0.1% HV ½ gap isolated Barrel at LArg temperature Under extensive test In the pit early October

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing5 Endcap: EM 1/4 8 Modules cold tested and integrated Per wheel !

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing6 Endcap: HEC 2/4 32 Modules cold tested and integrated Per wheel (2x2) Space to insert Fcal Hec2, Hec1, Emec

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing7 Endcap: FCAL 3/4 3 Modules cold tested and integrated per wheel Cu (em) W (had)

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing8 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 !!

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing9 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 End-capEM Barrel EMEC/HEC

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing10 EM linearity and energy resolution Linearity within ±0.25 (0.1)% for E>10 (40) GeV Energy resolution within spec and MC agreement Normalized to 100 GeV η=0.7 Beam energy (GeV) Linearity (Erec/Ebeam) Beam energy (GeV) Energy resolution 9.4% /  E  0.1%

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing11 EM Uniformity Global constant term within spec (0.7%) BarrelP13P GeV236.6 GeV RMS0.57%0.64% EndCapECC0ECC1ECC GeV120.0 GeV120.2 GeV RMS0.58%0.53%0.55% EndCapBarrel Energy (GeV) η (middle) Energy (GeV)

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing12 Position and angular resolution within spec 55 mrad/√E  Z ~20mm  Z ~5mm 245 GeV e Endcap  ~1.7 Energy (GeV)  θ (mrad) x √E ~550 mm at  =0 ~250 mm at  =0 Barrel    resolution (  units x 1000)

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing13 Time measurement Cell energy (GeV) Barrel Time resolution (ps) Fast signal in Argon  accurate time measurement Z vertex measurement, long lived particle id,… Front end electronic very low constant term < 20ps 70ps constant term within spec (100ps)

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing14 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  Endcap Barrel Powerful tool for commissioning: intercalibration (1ns), position (0.5mm EM, mms HEC), uniformity (<3‰ EM, 1% HEC) …

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing15 (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

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing16 Fcal calibration run FCAL energy calibration Edge scan at high |  | + HV test a=(3.76  0.06)% b=(24.5  0.84)  GeV % c=(145.5  1.6) GeV% E (GeV) σ/E (%) Electron energy resolution

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing17 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… TRTLAr Tilecal MDT-RPC EMEC HEC front HEC rear FCAL 1 FCAL 2 Cold TC Warm TC 2004 beam tests (the last before LHC)

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing18 Next 2005: Install electronics October March 2004 April : EC cryostats…

8/18/2004E. Monnier - CPPM - ICHEP04 - Beijing19 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