Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Instrumentation

HK 34.1: Gruppenbericht

Mittwoch, 21. März 2012, 16:30–17:00, P 2

Trigger-less readout of the PANDA Electromagnetic Calorimeter — Myroslav Kavatsyuk, Johan G. Messchendorp, Hossein Moeini, •Ganesh Tambave, and Herbert Loehner — KVI, University of Groningen, Zernikelaan 25, NL-9747AA Groningen

Charm-meson resonances and yet undiscovered glueballs might reveal the origin of the hadronic mass spectrum. To this end the PANDA collaboration at FAIR will exploit antiproton annihilations for precision studies of e.g. charmonium resonance states. In order to achieve a highly flexible event selection, a trigger-less data-acquisition system is currently being developed. We have constructed the prototype of a readout chain for the PANDA Electromagnetic Calorimeter (EMC), in order to demonstrate the feasibility of a fast online event selection on basis of high-level physics information. The readout is based on intelligent front-end electronics which autonomously recognises valid hits and extracts the relevant information. The EMC employs a sampling-ADC readout incorporating a pulse-processing algorithm [1], which is able to process data at hit rates up to 500 kHz, and includes the recovery of pile-up pulses. The developed algorithm was applied in the EMC prototype detector[2]. We will describe the functionality of the developed readout chain, present results of test experiments revealing the accuracy of time synchronisation, discuss the performance of the pile-up recovery algorithm, and report on the validation studies of the simulation package. [1] E. Guliyev, et al., NIM A 664 (2012) 22; [2] M. Kavatsyuk et al., NIM A 648 (2011) 77.