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.
Ulrich Wiedner, FAIR PAC meeting, March 14, 2005.
• 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
… base program for the first few years.
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.
Pressure - a measure
for the pellet rate
Experimental pellet distributions
pumps at both ends of PANDA
additional pumping between solenoid and dipole
line scan camera provides
online information on
pellet position <100 µm
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
Fast, high resolution scintillator for between 10 MeV - 2 GeV
Two possible solutions:
PbWO4 (PWO) crystals
Crystal size: 22 cm2 22 X0
light yield of PANDA crystals
better than as CMS crystals
Light yield ~ 8 times higher than PWO
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
Measurements with a tagged photon beam in Mainz:
deposited energy / GeV
2.5 m long, Ø 1.08 m, 11360 crystals
upstream: Ø 0.68 m, 816 crystals
downstream: Ø ~2 m, 6864 crystals
Cooling to -25 C, temperature stabilized to ±0.1 C
segmentation of the 160 crystals into 16 slices
Shashlyk modules composed of lead absorbers and scintillators
The PANDA collaboration is healthy and eagerly waiting
to build up the experiment and to do world-class physics.