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PANDA. Ulrich Wiedner, FAIR PAC meeting, March 14, 2005. PANDA Collaboration. • At present a group of 340 physicists from 46 institutions of 14 countries. Austria – Belaruz - China - Finland - France - Germany – Italy – Poland – Russia – Spain - Sweden – Switzerland - U.K. – U.S.A.

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Ulrich Wiedner, FAIR PAC meeting, March 14, 2005.

PANDA Collaboration

• At present a group of 340 physicists

from46 institutions of 14 countries

Austria – Belaruz - China - Finland - France - Germany – Italy – Poland – Russia – Spain - Sweden – Switzerland - U.K. – U.S.A..

3 new members

Basel, Beijing, Bochum, Bonn, Catania, Cracow, Dresden, Edinburg, Erlangen, Ferrara, Frankfurt, Genova, Giessen, Glasgow, GSI, Inst. of Physics Helsinki, FZ Jülich, JINR, Katowice, Lanzhou, LNF, Mainz, Milano, Minsk, TU München, Münster, Northwestern, BINP Novosibirsk, Pavia, Piemonte Orientale, IPN Orsay, IHEP Protvino,

PNPI St. Petersburg, Stockholm, Dep. A. Avogadro Torino, Dep. Fis. Sperimentale Torino, Torino Politecnico,Trieste, TSL Uppsala, Tübingen, Uppsala, Valencia, SINS Warsaw, TU Warsaw, AAS Wien

Unfortunately we lost KVI.

Spokesperson: Ulrich Wiedner - Uppsala

Main Physics Goals

  • Charmonium spectroscopy

  • QCD exotics

  • Hypernuclear Physics

  • Charm in Nuclei

… base program for the first few years.

The PANDA Detector

Layout of the detector (top view)

The Target Spectrometer

The Forward Spectrometer


Luminosity: L = Npbar • f • xtarget

Envisaged luminosity: L = 2×1032 cm–2s–1

Required target thickness: 5×1015 cm–2

Hydrogen pellet target.

Cluster jet target.

Targets for hypernuclear physics.

Pellet Target

Beam pipe and pellet pipe

1 mm

Pellet target: working principle and result

Pellet test station

Pressure - a measure

for the pellet rate

Experimental pellet distributions

Vacuum measurements

Predicted beam pipe vacuum

pumps at both ends of PANDA

additional pumping between solenoid and dipole

Pellet tracking system

under investigation:

line scan camera provides

online information on

pellet position <100 µm

Beam pipe pumping scheme

The Cluster Jet Target

The Cluster Jet Target Gas System

Slow Control

pp  

Targets for Hypernuclear Physics

Primary target:

Secondary target:

stopping of 

MC simulation of 


under large angles

Stopping points for (INC calulations)

Secondary target: sandwich of C absorber and Si detectors

lower light yield

slower and more expensive

The Electromagnetic Calorimeter


Fast, high resolution scintillator for  between 10 MeV - 2 GeV

Two possible solutions:

PbWO4 (PWO) crystals

BGO crystals

Crystal size: 22 cm2 22 X0

PWO crystals

light yield of PANDA crystals

better than as CMS crystals

Light yield: temperature dependant

Optical Transmission of crystals from different suppliers

Optical transmission after irradiation

For comparison: BGO crystals


Light yield ~ 8 times higher than PWO

Readout device: APD

CMS uses 5x5 mm2 APDs


10x10 mm2 APDs being

developed by Hamamatsu

Preliminary tests show

no significant differences.

Alternative readout devices like the PLANACON hybrid photomultiplier have been tested but show sensitivity to magnetic fields.

st / ns

Expected performance (PWO calorimeter)

Measurements with a tagged photon beam in Mainz:

deposited energy / GeV

The Mechanical Design

Barrel part:

2.5 m long, Ø 1.08 m, 11360 crystals

End caps:

upstream: Ø 0.68 m, 816 crystals

downstream: Ø ~2 m, 6864 crystals

Cooling to -25 C, temperature stabilized to ±0.1 C

Overall Integration

Individual tapered crystals

Design to reduce # of crystal shapes

segmentation of the 160 crystals into 16 slices

Single alveoli pack

Dead space zones

Concept and major components of a barrel slice

End cap design

Implementation of the EMC into PANDA

The Forward EMC

Shashlyk modules composed of lead absorbers and scintillators

Some benchmark channel simulation results


pp  g





e+e– (µ+µ–)


Charmed hybrid (JPC=1–+) channel

Production mode:

Invariant mass spectra





µ decay channel

Reconstruction efficiencies

Open charm channels

D*(2010)+ D*(2010)–


D0 decays

Reconstructed (4040) mass


The PANDA collaboration is healthy and eagerly waiting

to build up the experiment and to do world-class physics.

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