Abstract
The versatile 4π-detector PANDA will be built at the Facility for Antiproton and Ion Research (FAIR), an accelerator complex, currently under construction near Darmstadt, Germany. A cooled antiproton beam in a momentum range of 1.5 – 15GeV/c will be provided by the High Energy Storage Ring (HESR). All measurements at PANDA rely on an excellent performance of the detector with respect to tracking, particle identification and energy measurement. The electromagnetic calorimeter (EMC) of the PANDA detector will be equipped with 15744 PbWO4 crystals (PWO-II), which will be operated at a temperature of – 25° C in order to increase the light output. The design of the forward endcap of the EMC has been finalized. The crystals will be read out with Large Area Avalanche Photo Diodes (LAAPDs) in the outer regions and with Vacuum Photo Tetrodes (VPTTs) in the innermost part. Production of photosensor units utilizing charge integrating preamplifiers has begun. A prototype comprised of 216 PbWO4 crystals has been built and tested at various accelerators (CERN SPS, ELSA/Bonn, MAMI/Mainz), where the crystals have been exposed to electron and photon beams of 25MeV up to 15GeV. The results of these test measurements regarding the energy and position resolution are presented.
Highlights
The future accelerator complex FAIR will be built as an extension to the existing facilities of the GSI Helmholtzzentrum fur Schwerionenforschung near Darmstadt, Germany
The detector will be mounted at an internal target position of the High Energy Storage Ring (HESR), which will provide a cooled antiproton beam with a precise definition of the beam energy in a momentum range of 1.5 - 15 GeV/c
Noise and Threshold The best performance regarding energy equivalent noise has been measured for the Vacuum Photo Tetrodes
Summary
The Forward Endcap of the Electromagnetic Calorimeter for the PANDA Detector at FAIR. This content has been downloaded from IOPscience. Please scroll down to see the full text. Ser. 587 012050 (http://iopscience.iop.org/1742-6596/587/1/012050) View the table of contents for this issue, or go to the journal homepage for more. Download details: IP Address: 131.169.4.70 This content was downloaded on 29/01/2016 at 22:55 Please note that terms and conditions apply. 16th International Conference on Calorimetry in High Energy Physics (CALOR 2014)
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