1
ALICE Performance in p+p collisions Possible HI plan at LHC Prospects of ALICE in Pb+Pb collisions ALICE upgrade plan, physics for upgrades and timeline Completion of EMCAL/TRD(/PHOS) Trigger Plan DCAL VHMPID ITS-vertex FoCAL Summary and Outlook 2
3 ALICE demonstrated wide capabilities to measure soft & hard probes. K π p Ω J/ψ J/ψ
4 Studying QGP Era (MB) 2010 (official) - s NN = 2.76 TeV Pb + Pb (4 weeks) L~10 25 cm -2 s -1 2011 (anticipated)- s NN = 2.76 TeV Pb + Pb (4 weeks) L ~ few 10 26 cm -2 s -1 2012 (official) Shutdown for maintenance, installation & repair 2013 - s NN = 5.5 TeV Pb + Pb, L~10 27 cm -2 s -1 2014 - s NN = 5.5 TeV Pb + Pb, L~10 27 cm -2 s -1 Control experiments 2015 s NN = 8.8 TeV p + Pb & Pb + p or lighter A + A 2016 Shutdown LINAC4 /Collimation/RF & detector upgrade 2017 s NN = 5.5 TeV lighter A + A or s NN = 8.8TeV p+pb/pb+p Detail Studying Era (rare probes) 2018 s NN = 5.5 TeV high L Pb + Pb for hard probe physics 2019 s NN = 5.5 TeV high L Pb + Pb for hard probe physics 2020 Shutdown. upgrades
5 ALICE Potential in (First) Pb+Pb collisions Collect ~1.5x10 7 (2010) 10 8 (2011) MB events Global event properties (10 5 Pb+Pb events) Multiplicity, charged particle spectra, elliptic flow, Space-time evolution (10 6 Pb+Pb events) identified spectra/flow, resonances, particle ratio, correlation, high-pt, Jets and heavy favors (10 7 Pb+Pb events) energy loss, color screening
6 Upgrade plans to enrich the physics capabilities short(<2012)/mid(2013-2016)/long term plans(>2016) On going upgrades: Completion of EMCal(2010), TRD(2011-2012), (PHOS) Di-jet Calorimeter (DCAL) (2011-2012) Future TPC fast readout upgrade using new gas/electronics Very high momentum particle identification (VHMPID) 2 nd generation of vertex detectors (ITS) Forward Calorimeter (FoCAL) Backward Tracking vertex detectors before muon arm DAQ/HLT Upgrade (DDL-SIU interface, new IO bus, etc)
7 Timeline for the upgrades (of course, the schedule could be changed ) <2012 2013 2014 2015 2016 2017 2018 2019 2020 EMCAL/TRD DCAL VHMPID ITS upgrade FOCAL TPC DAQ Full installation Partial installation ready
8 Full installation of EMCal (2010), TRD(2011-2012) Setup for 2011 Setup for 2013 EMCAL TOF HMPID EMCAL TOF HMPID TRD TPC ITS TRD TPC ITS L3 Magnet L3 Magnet PHOS PHOS/DCAL
9 Possible Trigger plan for ALICE Minimum Bias : V0OR or SPD Rare Trigger : Centrality trigger: SPD High pt Trigger : TRD, VHMPID Jet Trigger: EMCAL, PHOS, DCAL Electron/Quarkonia Trigger: TRD Ultra-peripheral : TOF, TRD High Level Trigger: High multiplicity High pt particle (two particle), jets Invariant mass High pt J/psi High pt open charm EMCAL L0 trig.
10 60% extension of EMCal acceptance Incorporate PHOS and DCAL modules to produce a single, large EM calorimeter patch back-to-back with EMCAL. η x φ = 1.4 x 0.7 VHMPID PHOS DCAL Project Institution Catania, CERN, Franscati, Grenoble, INFN, Jyväskylä Nantes, Stranbourg, Tsukuba, ORNL, LBNL, Yale, Huston,LANL Wuhan
11 Study of the parton energy loss by taking the correlation with EMCAL γ-jets : quark jets di-jets, π 0 -jets: mostly gluon jets controllable variable: Path length M. Ploskon, QM09
12 Improve jet energy balance Balance = (E1-E2)/0.5*(E1+E2) Annual yield Up to 100 GeV in pi0-jets and di-jets Up to 30 GeV in γ-jets E π th > 20 GeV E π th > 40 GeV Qhat=0 GeV 2 /fm Qhat=20 Qhat=50 10 3
13 Assembled in Japan/Italy 1 SM in Tsukuba Infra preparation is on going. Beamtest of EMCAL-Tower at CERN (PS/SPS on Aug. 2011) Assembled in Grenoble/Nantes
14 Study of flavor dependence of particle production in A+A Energy loss for quark/gluon jets Modification of hadronization PID tagged jet tomography Extension of PID capability Upgrade based on HMPID Installation in ~2015 VHMPID Project Institution CERN, Chicago, Yale, Pusan, Eotvos Univ., KFKI, INFN Bari, Puebla, ICN(Mexico), Univ. Mexico MEX
15 Focusing RICH with spherical (or parabolic) mirrors C 4 F 10 gas radiator L=80 cm, γ th ~19 Photon detector baseline option: MWPC with CsI photocathode Thick-GEM with CsI photo-converter High pt trigger development K π 30 GeV cut on no. of photons 16 GeV ~ 3 σ separation! p
16 x2 Improve the impact parameter resolution x100 increase in charm sensitivity access to charmed baryons exclusive B decays and total B production cross section down to P T ~0 Improve flavor tagging. Thinner/smaller beam pipe r=2.9cm -> 2-2.5cm, r=800um -> 500-600um New pixel technology TPC SSD SDD SPD 6-> 7 layers, replace SDD -> SPD Thinner (<200um + 150um) Higher granularity (<150um x 450um) Hybrid active pixel detectors or Monolithic active pixel detectors (MAPS/MIMOSA/LePIX)
17 Forward Physics at LHC Parton PDF in proton/nuclei at small x Gluon Shadowing Gluon Saturation, CGC Elliptic Flow in A+A Long-Range rapidity correlation: Ridge phenomena Important information for the initial stage of collisions/thermalization. Initial state/glasma formation Fully exploit the opportunity offered by the LHC to access the small-x region & large saturation scale by going to forward rapidity. arxiv:0802.0139 From K.Itakura
18 Some hints from RHIC for CGC Forward hadron production in d+au De-correlation of recoil jets in d+au Suppression of away side of e-mu correlation in d+au (mu@small-x) Suppression of forward J/psi in d+au Important to measure photon/pi0 from hard process at forward rapidity PHENIX, T. Engelmore, APS2010 BRAHMS, NPA757(2005)1
19 (x, Q 2 ) map covered by FoCAL Measurement items π 0, prompt γ at η=2.5~4.5 in p+p/p+a π 0 -jets or dijets in p+p/p+a Inclusive photons/π 0 (in A+A) Stage 1 (z=3.5m, 2.5<η<4.5) in 2016 Stage 2 (4.5<η<6) in 2020. Project Institution CNS Tokyo, Yonsei, Kolkata, Mumbai, Jammu, Utrecht/Amsterdam, Prague Jyväskylä, Copenhagen, Bergen, Oak Ridge, Nantes, Jaipur
20 Segmented EM (W+Si) Calorimeter 21 layers (~21X 0 ) of W(~3.5mm) +Si pad (~1x1cm 2 ) Si strip for γ/π 0 separation Fine pixel readout and digital readout (MAPS, MIMOSA) <~300 towers in total Simulation/R&D are on going. Pi0 in p+pb by HIJING One tower config. (9cm x 9cm x ~10cm) Size: 9x9 cm 2 Thickness: 535µm Pad size: 1.1x1.1 cm 2 Number of pads : 64
21 ALICE has a powerful potential for the study of QGP in heavy ion collisions. Successfully commissioned and excellent performance in p+p collisions. Ready to explore a new QGP world!! ALICE started working for detector upgrades to enrich the physics capabilities. Short term plan Completion of TRD/EMCAL/(PHOS) Di-jet calorimeter Mid/Long term plan Very High Momentum Particle ID Inner Vertex Tracker Forward Calorimeter Stay tuned the outcomes from LHC-ALICE!!