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Status of the ALICE Project NIKHEF annual scientific meeting

Status of the ALICE Project NIKHEF annual scientific meeting. Thomas Peitzmann Universiteit Utrecht. QCD ground state color charge of quarks and gluons is confined chiral symmetry spontaneously broken pressure or heat leads to overlap of hadrons intuitive in bag model new state of matter:

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Status of the ALICE Project NIKHEF annual scientific meeting

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  1. Status of the ALICE ProjectNIKHEF annual scientific meeting Thomas PeitzmannUniversiteit Utrecht

  2. QCD ground state color charge of quarks and gluons is confined chiral symmetry spontaneously broken pressure or heat leads to overlap of hadrons intuitive in bag model new state of matter: color charges can move between hadrons deconfinement: quark-gluon-plasma restoration of chiral symmetry The Quark-Gluon-Plasma

  3. SPS QGP probably reached dominated by transition and hadron gas theoretically extremely difficult The QCD Phase Diagram • RHIC and LHC • dominated by QGP • theoretically simpler • coupling as small • thermodynamical “limit” • baryon. chem. potential mb = 0 • new physical observables • heavy quarks • jets

  4. PhD M. van Leeuwen NA49 strangeness and charm yields E. van der Pijll WA98 direct photons P. de Rijke NA57 omega production E. Schillings NA57 lambda polarisation A. Sokolov ALICE SSD module tests staff M. Botje N. van Eijndhoven R. Kamermans P. Kuijer G.-J. Nooren T. Peitzmann R. Snellings People (NIKHEF and Utrecht University)

  5. Example 1: WA98 (E. van der Pijll) study of direct photon production signal of hot initial state in heavy ion collisions very difficult: small signal with high background direct photon signal observed in WA98 development of new analysis method extension of analysis to lower transverse momenta even more difficult! Example 2: NA57 (E. Schillings, P. de Rijke) L polarisation (E. Schillings, see talk) small polarisation at mid-rapidity W production (P. de Rijke) understanding the systematic errors alignment, efficiencies, … SPS: Reaping The Harvest

  6. transverse mass spectra of different hadron species well described by thermalized source measures freeze-out conditions hadronic interactions stop similar temperatures for all SPS energies high average expansion velocity Hydrodynamical Model Fits To NA49 Data M. van Leeuwen

  7. exciting data from first beam times at RHIC the most important physics activity in present day heavy ion physics is happening at RHIC STAR one of the major players substantial contribution to be built up! see talk by R. Snellings central Au+Au collision at sNN=200GeV in the STAR TPC STAR RHIC: Joining The -Party

  8. hardware contribution: silicon strip detector design and prototyping well under way physics simulation efforts being started LHC: Preparations for ALICE

  9. Hardware Contributions • Detector 5mm • FE module 50 cm ADC racks outside magnet • Endcap 25 m • FEROM 200 m • CF support • Cooling Alice Inner Tracking System • DAQ

  10. preseries of double sided strip detectors delivered (Canberra, SINTEF, ITC) tested (IRES, Trieste) ladder spaceframes delivered (St. Petersburg) ASICs for endcap design ready (NIKHEF/UU) readout chain using prototype ASICs first test (NIKHEF/UU) testequipment for ASICs and hybrids operational (NIKHEF/UU) ladder assembly robot near to completion (NIKHEF/UU) first silicon strip detector module NIKHEF/UU + IRES design manufactured at IRES by Ukraine people to be tested at NIKHEF/UU Status Of Technical Work

  11. laser wavelength chosen to optimize penetration depth close to band gap energy 20-30% light absorbed nearly uniform density of ionization properties adequate for detector tests beam spot ≈ 30 µm larger than for particle, but small compared to strip pitch precision of positioning ≈ 1.5 µm Tests Of SSD With Infrared Laser A. Sokolov

  12. strip structure visible aspect ratio distorted y-axis compressed by factor 15 true angle: 35 mrad setup used for dead strip search relative calibration measurement of charge sharing 2-Dimensional Map Of Collected Charge

  13. Charge Sharing Around Dead Strip

  14. work on the Physics Performance Report for ALICE pA physics important link pp - pA - AA nuclear modifications no thermalization/phase transition further simulation studies foreseen prepare analysis framework for future data taking (pp, pA and AA) full tracking with ITS and TPC example: impact parameter vs. charged multiplicity HIJING simulations ALICE Physics Studies (Simulation)

  15. physics analysis from SPS experiments very fruitful! participation in STAR major activity in heavy ion group gearing up for ALICE hardware contribution well under way increase effort on physics simulations Summary

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