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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.11: Poster

Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max

Fast signal analysis for the PANDA Electromagnetic Calorimeter — •Elmaddin Guliyev, Myroslav Kavatsyuk, and Herbert Löhner — Kernfysisch Versneller Instituut, Zernikelaan 25, 9747 AA Groningen, The Netherlands

Antiproton-proton annihilations at the future FAIR facility at Darmstadt, Germany, will allow testing the theory of strong interactions, QCD, in the non-perturbative regime. The PANDA detector will be installed in the antiproton storage ring HESR providing an intense high-resolution antiproton beam with dense internal targets. The Electromagnetic Calorimeter (EMC) is a crucial component to provide high sensitivity for studies of charm-quark mesons, glue-balls and hybrid states. The EMC employs fast bright PWO scintillation crystals with Large-Area Avalanche Photo Diodes (LAAPD) as photo sensors. Low-noise low-power preamplifiers were developed suitable for the expected high rates and the required large dynamic range of photon energy deposition between 1 MeV and 12 GeV. Measurements were performed on signals from cooled PWO crystals equipped with LAAPD and either discrete or ASIC preamplifiers, recorded by a fast sampling ADC. Sampling rate and ADC resolution have been determined for achieving the required energy and timing performance. The concept of the EMC front-end electronics will be discussed, including a fast feature extraction algorithm. Results of recent prototype studies will be presented.