1 / 20

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

tavia
Télécharger la présentation

LHC

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related