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The detector

The detector of the Panda experiment is subdivided into the target spectrometer consisting of a solenoid around the interaction region and a forward spectrometer (FS) based on a dipole to mesure the momentum of the forward going particles. The combination of two spectrometers allows a full angular coverage, it takes into account the wide range of energies. Each of these two regions are themselves subdivided in subdetectors, specialized in the measurement and identification of the particles produced in the collisions of the antiproton beam with the target.

The barrel (left) and forward endcap part (right) of the Panda electromagnetic calorimeter. 
The parts of the barrel calorimeter are cut to get a better view to the inside.

The IPN is involved in the construction of the electromagnetic calorimeter, a detector that can mesure accurately the energy and position of photons and electrons. It consists of 16000 lead tungstate crystals (PbWO4) cut in the shape of truncated pyramids. The passage of the electrons and photons is detected with a large photodiode, glued to the rear face of the crystal and connected to a charge preamplifier. The service R & D detectors of the IPN has provided the thermal and mechanical design of the calorimeter and its integration.


 

IPN

Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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