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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

Main Physics Goals

  • Charmonium spectroscopy

  • QCD exotics

  • Hypernuclear Physics

  • Charm in Nuclei

… base program for the first few years.

The panda detector

The PANDA Detector

Layout of the detector top view

Layout of the detector (top view)

The target spectrometer

The Target Spectrometer

The forward 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

Pellet Target

Beam pipe and pellet pipe

Beam pipe and pellet pipe

Pellet target working principle and result

1 mm

Pellet target: working principle and result

Pellet test station

Pellet test station


Pressure - a measure

for the pellet rate

Experimental pellet distributions

Vacuum measurements

Vacuum measurements

Predicted beam pipe vacuum

Predicted beam pipe vacuum

pumps at both ends of PANDA

additional pumping between solenoid and dipole

Pellet tracking system

Pellet tracking system

under investigation:

line scan camera provides

online information on

pellet position <100 µm

Beam pipe pumping scheme

Beam pipe pumping scheme

The cluster jet target

The Cluster Jet Target

The cluster jet target gas system

The Cluster Jet Target Gas System

Slow control

Slow Control

Targets for hypernuclear physics

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

The electromagnetic calorimeter

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

PWO crystals

light yield of PANDA crystals

better than as CMS crystals

Light yield temperature dependant

Light yield: temperature dependant

Optical transmission of crystals from different suppliers

Optical Transmission of crystals from different suppliers

Optical transmission after irradiation

Optical transmission after irradiation

For comparison bgo crystals

For comparison: BGO crystals


Light yield ~ 8 times higher than PWO

Readout device apd

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.

Expected performance pwo calorimeter

st / ns

Expected performance (PWO calorimeter)

Measurements with a tagged photon beam in Mainz:

deposited energy / GeV

The mechanical design

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

Overall Integration

Individual tapered crystals

Individual tapered crystals

Design to reduce of crystal shapes

Design to reduce # of crystal shapes


segmentation of the 160 crystals into 16 slices

Single alveoli pack

Single alveoli pack

Dead space zones

Dead space zones

Concept and major components of a barrel slice

Concept and major components of a barrel slice

End cap design

End cap design

Implementation of the emc into panda

Implementation of the EMC into PANDA

The forward emc

The Forward EMC

Shashlyk modules composed of lead absorbers and scintillators

Some benchmark channel simulation results

Some benchmark channel simulation results

Charmed hybrid j pc 1 channel


pp  g





e+e– (µ+µ–)


Charmed hybrid (JPC=1–+) channel

Production mode:

Invariant mass spectra

Invariant mass spectra





Decay channel

µ decay channel


Reconstruction efficiencies

Open charm channels

Open charm channels

D*(2010)+ D*(2010)–


D0 decays

Reconstructed 4040 mass

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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