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ALICE

ALICE. 2010. Alice at LHC : Detector and Physics. Overview The LHC as Ion collider SPS-RHIC-LHC Global properties in the LHC regime ALICE and its experimental strategy Suite of detectors Performance Status. Table : budget HR. Chart : budget BE. Text pour commentaire Du graphique….

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ALICE

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  1. ALICE 2010

  2. Alice at LHC : Detector and Physics • Overview • The LHC as Ion collider • SPS-RHIC-LHC • Global properties in the LHC regime • ALICE and its experimental strategy • Suite of detectors • Performance • Status Valerie Huret

  3. Table : budget HR Valerie Huret

  4. Chart : budget BE Text pour commentaire Du graphique… Valerie Huret

  5. Under study: extension of PID to higher momenta Combine TPC and TRD dE/dx capabilities (similar number of samples/track) to get statistical ID in the relativistic rise region Hadron and Lepton Identification Valerie Huret

  6. Movie Valerie Huret

  7. Novel aspects… Multiplicity Valerie Huret

  8. LHC as Ion Collider • Running conditions: • Other collision systems: pA, lighter ions (Sn, Kr, Ar, O) Valerie Huret

  9. Novel Aspects… soft processes • Probe initial partonic state in a novel Bjorken-x range (10-3 - 10-5): • nuclear shadowing, • high-density saturated gluon distribution. Valerie Huret

  10. Novel Aspects…Hard processes • Hard processes contribute significantly to the total AA cross-section • Bulk properties dominated by hard processes • Very hard probes are abundantly produced • Weakly interacting probes become accessible (γ, Z0, W±) Valerie Huret

  11. List with SmartArt Graphic Valerie Huret

  12. Alice re….

  13. Alice PhysicsReach… • Global properties • Multiplicities, η distributions • Degrees of Freedom vs Temperature • Hadron ratios and spectra • Dilepton continuum • Direct photons • Collective effects • Elliptic flows Valerie Huret

  14. And experimental consequences for ALICE • Large Acceptance Coverage • Large Momentum Coverage (from 100 MeV/c to > 100 GeV/c) • Excellent photon detection ( in Δφ =450 and η = 0.1) • Large acceptance… • calorimetry very desirable, for which only the infrastructure exists, but not yet the detector Valerie Huret

  15. Alice Layout: Tracking Valerie Huret

  16. Tableau d’Excel Valerie Huret

  17. Alice Layout: PID Valerie Huret

  18. Chart… Valerie Huret

  19. Silicon Pixel Detector SPD • successful system beam test Oct. ’03 • including full FEE and DAQ • bump bonding at VTT (Finland) • series production started ( > 99%) • Three assembly sites operational Valerie Huret

  20. Silicon Strip Detector SSD • Production: • sensors from three vendors under production • FEE electronics: all chips in production • micro-cables & hybrids (Ukraine): • very advanced technology; need to reach production speed • Assembly • shared between 4 ( later 5) sites (Finland, France, Italy); pre-production validated • Status • viable, but very tight schedule Valerie Huret

  21. FEE: 48 channels with digital signal processing Serves also for other ALICE Detectors: PHOS, FMD Also considered for RHIC detector upgrades TPC – FEE Valerie Huret

  22. ALICE TRD : Ionization, Tracklet, Triggering Valerie Huret

  23. Marc, le voisin de Arielle Valerie Huret

  24. Muon Tracking System • Advanced ‘Pad-chamber’ system with • 1.2* 106 readout channels • Sagitta resolution of < 50 μm for • Mass resolution of ~ 80 MeV at Upsilon • Production of chambers started in • France, India, Italy, Russia Valerie Huret

  25. Jets : reflect interactions of partons in partonic matter Effects Jets and Jet quenching (I) Valerie Huret

  26. Jets and Jet Quenching (II) • Experimental Consequences • Measurement of Jet Energy is important • In present configuration Alice measures only charged particles ( and electromagnetic energy in PHOS) • Large EM Calorimeter would provide significant performance bonus • Measurement of Jet Structure very important • Requires good momentum analysis from ~ 1Gev/c to ~100 Gev/c • Alice excells in this domain • pp and pA measurements essential as reference for physics in cold nuclear matter Valerie Huret

  27. Animations Valerie Huret

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