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PANDA

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

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

  2. 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

  3. Main Physics Goals • Charmonium spectroscopy • QCD exotics • Hypernuclear Physics • Charm in Nuclei … base program for the first few years.

  4. The PANDA Detector

  5. Layout of the detector (top view)

  6. The Target Spectrometer

  7. The Forward Spectrometer

  8. 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.

  9. Pellet Target

  10. Beam pipe and pellet pipe

  11. 1 mm Pellet target: working principle and result

  12. Pellet test station

  13. Pressure - a measure for the pellet rate Experimental pellet distributions

  14. Vacuum measurements

  15. Predicted beam pipe vacuum pumps at both ends of PANDA additional pumping between solenoid and dipole

  16. Pellet tracking system under investigation: line scan camera provides online information on pellet position <100 µm

  17. Beam pipe pumping scheme

  18. The Cluster Jet Target

  19. The Cluster Jet Target Gas System

  20. Slow Control

  21. pp   Targets for Hypernuclear Physics Primary target: Secondary target: stopping of  MC simulation of  rescattering under large angles

  22. Stopping points for (INC calulations)

  23. Secondary target: sandwich of C absorber and Si detectors

  24. 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

  25. PWO crystals light yield of PANDA crystals better than as CMS crystals

  26. Light yield: temperature dependant

  27. Optical Transmission of crystals from different suppliers

  28. Optical transmission after irradiation

  29. For comparison: BGO crystals 60Co Light yield ~ 8 times higher than PWO

  30. 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.

  31. st / ns Expected performance (PWO calorimeter) Measurements with a tagged photon beam in Mainz: deposited energy / GeV

  32. 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

  33. Overall Integration

  34. Individual tapered crystals

  35. Design to reduce # of crystal shapes

  36. segmentation of the 160 crystals into 16 slices

  37. Single alveoli pack

  38. Dead space zones

  39. Concept and major components of a barrel slice

  40. End cap design

  41. Implementation of the EMC into PANDA

  42. The Forward EMC Shashlyk modules composed of lead absorbers and scintillators

  43. Some benchmark channel simulation results

  44.  pp  g  c()S-wave  J/  e+e– (µ+µ–)  Charmed hybrid (JPC=1–+) channel Production mode:

  45. Invariant mass spectra J/  c g

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