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LHC

Again a talk on LHC !. LHC. ATLAS. Milestones. For 200?. CMS. The ATLAS liquid argon detectors. Pascal Perrodo, LAPP-IN2P3 Annecy, for the ATLAS LAR and L1 trigger Collaborations. Status and recent results of the liquid argon detectors : Electromagnetic calorimeters

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LHC

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  1. Again a talk on LHC ! LHC ATLAS Milestones For 200? CMS Pascal PERRODO, ATLAS-LAPP

  2. The ATLAS liquid argon detectors Pascal Perrodo, LAPP-IN2P3 Annecy, for the ATLAS LAR and L1 trigger Collaborations • Statusand recent results of the liquid argon detectors : • Electromagneticcalorimeters • Hadronic endcap calorimeter • Forward calorimeters • Developments on the e.m./isolated hadron L1 trigger Pascal PERRODO, ATLAS-LAPP

  3. The ATLAS liquid argon system EM Barrel =0 =1.4 Countries : Canada CERN France Germany Italy Morocco Russia Slovakia Spain Switzerland USA EM EndCap Had EndCap =3.2 =4.9 IP FCAL Pascal PERRODO, ATLAS-LAPP

  4. LHC liquid argon calorimetry Calibration Board • Beam Crossing 25 ns, drift time 400 ns • Minimum bias events, noise Front End Board Pascal PERRODO, ATLAS-LAPP

  5. The electromagnetic calorimeter =2/16 Accordion geometry : hermicity in , fast response, radiation hard, uniformity Endcap : wedge, variable HV =2/8 Pascal PERRODO, ATLAS-LAPP

  6. The hadronic endcap calorimeter Readout (ElectroStatic Transformer): Schematics of a module: Radiation hardness, Jet reconstruction, 50%/√E, ET and missing ET measurements =2/32 Pascal PERRODO, ATLAS-LAPP

  7. The forward calorimeter High rate and ionisation, Drift time ≈50 ns Readout principle: Three successive wheels : Cu W W Plug Assembly of a tungsten wheel: Pascal PERRODO, ATLAS-LAPP

  8. 25 ns gphy(t) Mphy Mcal gcal(t) Si Fitted Measured Signal and energy reconstruction Shape in Calibration and Physics : Uniformity at 0.7 % Energy E = ai si , ai in GeV/ADC Simple electrical model : Validity of the modelisation : Validite the modelisation Provide an absolute electronic calibration Pascal PERRODO, ATLAS-LAPP

  9. EM barrel uniformity 4/32 EMB, 3/16 EMEC tested. Corrections : Expected : 0.7% over the EM detector Pascal PERRODO, ATLAS-LAPP

  10. Drift time and temperature effect Drift time measured from the physics shape in the HEC : HEC: I= f(T) EMbarrel: E= f(T) In agreement with expectation : 2% / K on the energy Pascal PERRODO, ATLAS-LAPP

  11. HV corrections in EM modules If one HV line is missing, E = E x 2 in a sector At the transition, the effect is understood and reproducible by MC DATA MC DATA MC Pascal PERRODO, ATLAS-LAPP

  12. EM endcap position resolution Endcap electrode : Strips in front layer (strips)=0.025/6 S-shape correction, Beam chambers resolution 0.35mm ->angular resolution 50 mrad/√E Pascal PERRODO, ATLAS-LAPP

  13. g / p° separation gbeam, kinematicalassociation of 2g Distance(g g For H->gg 90% photon's efficiency <R>(Expected)=3.0 Preliminary <R>(DATA)=2.600.05 <R>(MC)=2.820.1 Looks promising DATA, MC, Kin. study Pascal PERRODO, ATLAS-LAPP

  14. HEC results Muons : Signal reconstruction: • 24/134 modules to Test Beam • Linearity and resolution for e and  Electron resol. =21.5%/√E Ratio e/h ≈ 1.5 Pion resol. : Pascal PERRODO, ATLAS-LAPP

  15. FCAL results R Energy resolution Expected 100%/E1/2 + 10 % • Radial weighting • Narrow jets in FCAL Pascal PERRODO, ATLAS-LAPP

  16. EM barrel wheel assembly 3/4 of the 1st wheelalready assembled Accordion Structure barrel cryostat Pascal PERRODO, ATLAS-LAPP

  17. Endcap EMEC and HEC assembly Endcap cryostat : EMEC assembly : FCAL assembly: 1st HEC wheel: 24/32 modules assembled Pascal PERRODO, ATLAS-LAPP

  18. e.m./isolated hadron Trigger • Generation of the L1 signal from the LAR calorimeters : L1 • Isol. Had. criteria : • had cluster > Thr4 • em isolation < Thr5 • had isolation > Thr6 • local maximum • E.M. criteria : • em cluster > Thr1 • em isolation < Thr2 • had isolation < Thr3 • local maximum • Trigger windows : • Local Maximum for a RoI : Pascal PERRODO, ATLAS-LAPP

  19. Trigger Implementation A CPM board with 8 FPGA (Xilinx XCV1000E) • Acceptance in four quadrants -> 4 crates • 56 Cluster Processors Modules (CPM) • Each FPGA processes 4x2 (,) towers Communication between boards via the back plane Serialisation 20 bits at 40MHz -> 5 bits at 160 MHz Time needed 175ns <600ns Pascal PERRODO, ATLAS-LAPP

  20. Conclusions • Assembly of the ATLAS LAR system is going well, almost half is done • Test beams for serie modules give good results (NIM) • Next test beams : EM barrel +tiles, 2004 EM endcap + hadronic, 2002 EMEC, HEC FCAL, 2003 ? IP Pascal PERRODO, ATLAS-LAPP

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