Download - C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

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Page 1: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

Physics with Antiprotons - Detector -

• Detector requirements

• Overview of the detector concept

• Detector components

• Trigger

• Costs

Page 2: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

Detector requirements (simulations)

• Energy release of charmed hadrons high → large ptrans → large angles

• High cm-velocity (fixed target) → high energies → small angles

Formation of Ψ’ and decay in muons

Ψ’→μ+μ-

Ψ’→J/Ψ + X ↓ μ+μ-

electrons similar→ calorimeter for large angles.

Page 3: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

Detector requirements (PID)

• Forward angles need π/K separation up to 3 GeV/c: Cherenkov n=1.02

• Backward: higher value of n.

p+p → ΦΦ→ 4K s½ =3.6 GeV

Page 4: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

Overview of detector concept

internal target

forward spectrometertarget spectrometer

Heavy charmed mesons decay inlight products with large pt.Solenoid is important.

top view

Page 5: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

Overview of detector conceptside view

Page 6: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

Page 7: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

Central tracking: Microvertex Detector 7.2 mio. barrel pixels

50 x 300 μm

2 mio. forward pixels100 x 150 μm

beam pipe

pelle

t pi

pe

Space resol.: σz=80μm, σ r-φ=15μmTrack resol. : σL=60-300 μm σT =12μm

Readout: ASICs (ATLAS/CMS) 0.37% X0

or pixel one side – readout other side (TESLA)

Page 8: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

Central tracking:

Straw tubesWASA@Celsius

15 skewed double layers to remove left-right ambiguity

Ø 4-8 mm

skew angle: 5-15o APUD@HESR

p+p → φ φ →K+ K- K+ K-

Page 9: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

Mini Drift Chambers• 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

APUD@HESR

Page 10: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

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

Page 11: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

Cherenkov opening angle: Internal reflection → different vel. thresholds

p + p → J/Ψ+φ @ 8.5AGeV/cε=80%

PID: DIRC

Page 12: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

Calorimeter

PbWO4

Length = 17 X0

APD readout (in field)σ(E) = 1.54% / E½ + 0.3%

pp J/Ψ + η γγ

140o

5o

22o

Page 13: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

e±/π± sep.

electron/pion separation 10-3

2 4 6 8 p (GeV/c)0

Ed

ep (

GeV

/c)

2

4

6

8

10

e+/-

π+

2 4 6 8 p (GeV/c)0

10-3

π+ probability

Page 14: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

Trigger• 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

HADES@GSI

Page 15: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

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

Page 16: C. Schwarz Physics with Antiprotons - Detector - Detector requirements Overview of the detector concept Detector components Trigger Costs.

C. Schwarz

CostsSolenoid 2.5 M€

Calorimeter (target spectrometer) 12.5 M€

Tracking (pixel detector, straw tubes) 3.0 M€

Cherenkov 3.5 M€

Hypernuclei (read out electronics,micro tracker) 2.0 M€

Varia (e.g. refurbishing of forward detector parts) 1.9 M€

Trigger 1.5 M€

Infrastructure 2.0 M€

Contingency 2.0 M€

Sum 30.9 M€