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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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Panda

PANDA

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


Panda

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

http://www.gsi.de/panda


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


Target

Target

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


Panda

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 

rescattering

under large angles


Panda

Stopping points for (INC calulations)


Panda

Secondary target: sandwich of C absorber and Si detectors


The electromagnetic calorimeter

lower light yield

slower and more expensive

The Electromagnetic Calorimeter

Required:

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

60Co

Light yield ~ 8 times higher than PWO


Readout device apd

Readout device: APD

CMS uses 5x5 mm2 APDs

For PANDA:

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


Panda

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



c()S-wave

J/



e+e– (µ+µ–)



Charmed hybrid (JPC=1–+) channel

Production mode:


Invariant mass spectra

Invariant mass spectra

J/



c

g


Decay channel

µ decay channel


Panda

Reconstruction efficiencies


Open charm channels

Open charm channels

D*(2010)+ D*(2010)–

D*±D0±

D0 decays


Reconstructed 4040 mass

Reconstructed (4040) mass


Summary

Summary

The PANDA collaboration is healthy and eagerly waiting

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


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