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HADES

HADES . Upgrade for DIRAC-Phase-1. P. Salabura Jagiellonian University Krak ów, GSI Darmstadt . HADES detector @ GSI. 20 institutions from 20 countries 1994 approved 2002 first production run. Physics runs conducted. November 2002 : C+C 2 AGeV, commissioning and physics runs

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HADES

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  1. HADES Upgrade for DIRAC-Phase-1 P. Salabura Jagiellonian University Kraków, GSI Darmstadt

  2. HADES detector @ GSI • 20 institutions from 20 countries • 1994 approved • 2002 first production run

  3. Physics runs conducted • November 2002: C+C 2 AGeV, commissioning and physics runs • two level trigger scheme (LVL1/LVL2) 220 Mevents • full coverage with inner MDCI/II, 2 sectors complete tracking (MDCI-IV) • inclusive e+,e- production ("DLS enhancement") • February 2004: p+p 2.2 GeV • LH2 target400 Mevents • complete tracking in 4 sectors, 2 sectors with MDC(I-III) • exclusive meson reconstruction • August 2004: C+C 1AGeV • complete tracking in 4 sectors, 2 sectors with MDC(I-III) • inclusive e+,e- production ("DLS enhancement" 650 Mevents • September 2005: Ar+KCl 1.75 AGeV 2200 Mevents • complete tracking in 4 sectors, 2 sectors with MDC(I-III) • inclusive e+,e- production: vector mesons in medium

  4. within acceptance Dielectrons from C+C @ 2 AGeV • 16k signal pairs @ S/B>1 for M>140 MeV/c2 • Corrected for Reconstruction Efficiency • Inside HADES geometrical acceptance, no extrapolation to 4! • Compared with a cocktail based on known or mt-scaled meson multiplicities and their vacuum decay properties.  M/M()= 10%. no outer tracking

  5. 0 =14 MeV/c2  (pp/e+/e-) missing mass vs (pp) missing mass distributions Exclusive meson reconstruction in pp @ 2.2 GeV Electromagnetic channels Hadronic channels • pp→pp→ppe+e- pp→pp→pp+-0 • pp→pp0→ppe+e-

  6. future upgrades Needed for : (I) HI systems with at 1-2 AGeV Atot>80 (II) HADES @ FAIR (8AGeV) (III) High intenisty pion beams • RPC (inner time-of-flight) →essential for HI, important for elementary channels with strangeness production (/K separation) (FP6 construction -> P. Fonte) • Forward hodoscope →essential for p+d, important for HI (FP6 construction-> H. Stroebele) • Pion tracking →essential for +p, +HI • DAQ →essential for HI (FP6 construction-> M. Traxler)

  7. TOFINO Granularity: 1080 cells target • RPC: • 180 cells/sector (double hit<10% for 1.0 AGeV Au+Au) • time resolution < 100 ps HADES1-TOFINO replacement by RPC • TOFINO:(time-of-flight between 180 -45o) • 4 paddles per sector only • limited resolution (450 ps) • insufficient granularity for HI

  8. RPC for HADES • operational parameter matched to HADES overall performance • granularity: double-hit probability below 10% • resolution: 100 ps (s) or better • rate capability: up to 600 Hz/cm2 (at forward) • efficiency: above 95% for single hits • concept of the design: • shielded single cells • 4 gaps with commercial glass 2mm thick • common gas box sector-wise • customized read-out: FEE (preamp, discriminator, TimeOverThreshold) + TDC (128 channels) based on HPTDC & CPU with fast ethernet Gas mixture: 98.5% C2H2F4 + 1% SF6 + 0.5% i-C4H10 Potential = 3 kV • All full-size components produced and tested10.05 @GSI • 30 months duration workplane details in talk of P. Fonte

  9. HADES2-Forward hodoscope Acceptance for charge particles with  < 80 • Collective observables for dilectron production in HI collisions (flow) • event plane determination • measurement of reaction centrality • Spactator tagging for d+p reactions • direct comparison of dielectron productionin pp and p+n reactions • Upgrade of old and well known KAOS FH: • inspection of detectors (380 modules), new reflecting cover for light guides, mainframe modifications • new digital (TDC) electronic – same as used for the RPC • new HV and slow control system • Total project duration 12 months → see talk of H. Stroebele for workplan details

  10. HADES3 – DAQ upgrade (1) Exchange of CPUs for event building for more efficient transport of large events. • x86 CPUs running under LINUX and featuring GIGAbit Ethernet • successfully tested in the last Ar+KCl beam time (2) New Image Processing Unit for Time of Flight and RPC detector • essential for heavy systems (Atot >80) with large multiplicities (3) New Matching Unit for faster processing of second level trigger in large multiplicity environment • essential for heavy systems (Atot>80 ) with large multiplicities • Final goal is to reach 20 KHz LVL1 trigger rate (presently 7kHz) Total duration 26 months → see talk of M. Traxler for workplan details

  11. time line DIRAC AA collisions 2008 p, on p, d 2005 2006 2007 p on p, A

  12. Allocated man power and investment • 5 institutions: GSI Darmstadt, Institute fuer Kernphysik Frankfurt (IKF), Jagiellonian University (JU) Kraków, University Santiago de Compostella (USC), Laboratório de Instrumentação e Física Experimental de Partículas(LIP) Coimbra, Nuclear Physics Institute (INR) Rez, Institute for Nuclear Reasearch Moscow • 3 tasks: HADES1-RPC (P.Fonte), HADES2-FH (H.Stroebele), HADES3-DAQ (M. Traxler) Man power : DIRAC Investment (k€): DIRAC All 321 72 132 132 60 96 129 Total 570 130 100

  13. HADES collaboration 1)Institute of Physics, Slovak Academy of Sciences, 84228 Bratislava, Slovakia 2)Istituto Nazionale di Fisica Nucleare - Laboratori Nazionali del Sud, 95125 Catania, Italy 3)Dipartimento di Fisica e Astronomia, Università di Catania, 95125, Catania, Italy 4)LIP-Laboratório de Instrumentação e Física Experimental de Partículas, Departamento de Física da Universidade de Coimbra, 3004-516 Coimbra, Portugal 5)Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30059 Cracow, Poland 6)Gesellschaft für Schwerionenforschung mbH, 64291 Darmstadt, Germany 7)Joint Institute of Nuclear Research, 141980 Dubna, Russia 8)Institut für Kernphysik, Johann Wolfgang Goethe-Universität, 60486 Frankfurt, Germany 9)II.Physikalisches Institut, Justus Liebig Universität Giessen, 35392 Giessen, Germany 10)Istituto Nazionale di Fisica Nucleare, Sezione di Milano, 20133 Milano, Italy 11)Dipartimento di Fisica, Università di Milano, 20133 Milano, Italy 12)Institute for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia 13)Institute of Theoretical and Experimental Physics, 117218 Moscow, Russia 14)Physik Department E12, Technische Universität München, 85748 Garching, Germany 15)Department of Physics, University of Cyprus, 1678 Nicosia, Cyprus 16)Institut de Physique Nucléaire d'Orsay, CNRS/IN2P3, 91406 Orsay, France 17)Nuclear Physics Institute, Academy of Sciences of Czech Republic, 25068 Rez, Czech Republic 18)Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, PF 510119, 01314 Dresden, Germany 19)Departamento de Física de Partículas. University of Santiago de Compostela. 15782 Santiago de Compostela, Spain 20)Instituto de Física Corpuscular, Universidad de Valencia-CSIC,46971-Valencia, Spain

  14. in-medium calculation vacuum calculation • collisional broadening • extended VDM + decoherence • Brown-Rho scaling of VMs • See Phys. Rev. C68 (2003) 014904 for details. • Filtered with HADES acceptance • resolution smeared Comparison with transport theory RQMDcalculation: D. Cozma, C. Fuchs and A. Faessler, Tübingen

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