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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Instrumentierung VIII

HK 46.2: Group Report

Wednesday, March 23, 2011, 17:00–17:30, HS1

Digital signal processing in the PANDA Electromagnetic Calorimeter — •Myroslav Kavatsyuk, Elmaddin Guliyev, Ganesh Tambave, and Herbert Loehner — KVI, University of Groningen, The Netherlands

The PANDA collaboration at FAIR will employ antiproton annihilations to investigate yet undiscovered charm-meson states and glueballs. The aim is to study QCD phenomena in the non-perturbative regime and to unravel the origin of hadronic masses. A multi-purpose detector for tracking, calorimetry and particle identification is presently being developed to run at high luminosities providing up to 2·10⁷ interactions/s. One of the crucial components of the PANDA spectrometer is the EMC, composed of cooled PbWO₄ crystals coupled to the Large Area Avalanche Photodiodes or Vacuum Photo-Triodes/Tetrodes. The photo-sensor signals are continuously digitized by the Sampling ADC (SADC) and analyzed on-line in the FPGA of the digitizer module to detect hits and extract energy and time information. Measurements with a prototype calorimeter were performed at the tagged-photon facility at MAMI-C, Mainz. The results demonstrate the excellent performance of the SADC readout, with energy resolutions better than achieved by analogue electronics and a sub-nanosecond time resolution. A fast on-line pile-up recovery algorithm has been developed. The layout of the complete digital read-out chain will be presented and results from applications in test experiments with the PANDA-EMC prototypes will be reported.

This work is supported in part by BMBF and GSI.