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Physics with Antiprotons - Detector -

Physics with Antiprotons - Detector -. Detector requirements Overview of the detector concept Detector components Trigger Costs. Detector requirements (simulations). Formation of Ψ’ and decay in muons.

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Physics with Antiprotons - Detector -

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  1. Physics with Antiprotons - Detector - • Detector requirements • Overview of the detector concept • Detector components • Trigger • Costs

  2. Detector requirements (simulations) Formation of Ψ’and decay in muons • Energy release of charmed hadrons high → large ptrans → large angles • High cm-velocity (fixed target) → high energies → small angles Ψ’→μ+μ- electrons similar → calorimeter for large angles. Ψ’→J/Ψ + X ↓ μ+μ-

  3. Detector requirements (PID) p+p → ΦΦ→ 4K s½ =3.6 GeV • Forward angles need π/K separation up to 3 GeV/c: Cherenkov n=1.02 • Backward: higher value of n.

  4. Overview of detector concept target spectrometer forward spectrometer internal target top view Heavy charmed mesons decay in light products with large pt. Solenoid is important.

  5. side view Overview of detector concept

  6. 2 mio. forward pixels 100 x 150 μm 7.2 mio. barrel pixels 50 x 300 μm beam pipe pellet pipe Central tracking: Microvertex Detector Readout: ASICs (ATLAS/CMS) 0.37% X0 or pixel one side – readout other side (TESLA) Space resol.: σz=80μm, σ r-φ=15μm Track resol. : σL=60-300 μm σT =12μm

  7. Central tracking:Straw tubes WASA@Celsius p+p → φφ →K+ K- K+ K- 15 skewed double layers to remove left-right ambiguity Ø 4-8 mm skew angle: 5-15o APUD@HESR

  8. Mini Drift Chambers APUD@HESR • 6 layers of sense wires in 3 double layers (y,u,v) • not stretched radially (mass) • realized at HADES • expected counting rates • position resolution 70μm HADES@GSI

  9. Particle identification • PID from • 00<Θ<50 hadronic calorimeter • 50<Θ<220 Aerogel Cherenkov Counters • 220<Θ<1400 DIRC (BABAR@SLAC) DIRC thickness: 0.19 X0

  10. PID: DIRC Cherenkov opening angle: Internal reflection → different vel. thresholds p + p → J/Ψ+φ @ 8.5AGeV/c ε=80%

  11. Calorimeter 22o 140o 5o PbWO4 Length = 17 X0 APD readout (in field) σ(E) = 1.54% / E½ + 0.3% pp  J/Ψ+η γγ

  12. 10 e±/π±sep. 8 e+/- 6 Edep (GeV/c) 4 2 π+ 0 2 4 6 8 p (GeV/c) π+ probability 10-3 electron/pion separation  10-3 0 2 4 6 8 p (GeV/c)

  13. Front end and DAQ structure pipelining 3-level trigger Ex.: HADES/LHCb LVL-1: <106 events/s J/ψ large pT (e, μ) neutral K, hyperons: multiplicity jump in MVD D-meson: vertex LVL-2: <104 events/s Pattern recognition EMC: em. shower photon reconstruction Minv from EMC or muons LVL-3: <103 event/s global kin. conditions Trigger HADES@GSI

  14. Pellet target • Frozen hydrogen pellets 20-40μm • Δx=±1 mm (±0.04o) • 60 m/s • 70000 pellets/sec. • 1014-1016 atoms/cm2 (avg.) 1 mm

  15. Costs

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