Experimental instruments and technique

The electromagnetic calorimeter first level trigger system of the COMET experiment

L. B. Epshteyn^ab, D. N. Grigor'ev^ab, D. V. Shoukavy<sup>c

a</sup> G I. Budker Institute of Nuclear Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk
^b Novosibirsk State Technical University
^c B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk

Abstract: The first level trigger system of the COMET electromagnetic calorimeter, which performs real-time analysis of calorimeter data, is described. Experimental measurements were carried out on the electron beam of the first level trigger system equipment using the proposed algorithm: the overall efficiency at energy release above 30 MeV was 99.4%, above 40 MeV – 99.7%, and the own energy resolution of the first level trigger system was better than 5% for registered signal events (electrons with an energy of 105 MeV). The trigger signal latency measurements between event generation time and its arrival at the digitizing boards measuring channels were made.

Keywords: trigger system, trigger algorithm, clustering algorithm, digital signal processing, electronics.

Received: 17.03.2025
Revised: 14.05.2025
Accepted: 20.05.2025

DOI: 10.61011/JTF.2025.11.61610.38-25

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