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IEEE Transactions on Nuclear Science 55 (2008) 817-821
The Electromagnetic Calorimeter Trigger System for the AMS-02 Experiment
F. Cervelli, G. Coignet1, G. Cougoulat1, S. Di Falco, C. Goy1, R. Hermel1, R. Kossakowski1, M. Incagli, Z. H. Li, Y. S. Lu, C. Magazzu, E. Pedreschi, M. Piendibene, F. Pilo, J. Pochon1, S. Rosier-Lees1, F. Spinella, C. Vannini, J.P. Vialle1
AMS Collaboration(s)
(2008)

AMS-02 is an astroparticle experiment designed for a very precise measurement of the primary cosmic rays spectrum. The experiment will operate on board the ISS at a 400 km altitude for a period of about 3 years. The main scientific goals of the experiment are the search for antimatter, for dark matter and the study of gamma rays. In AMS-02 the Electromagnetic Calorimeter plays a key role for its high capability to measure $e^{+}$, $e^{-}$ and gamma spectra and to suppress the background generated by p and He nuclei. To directly detect photons the calorimeter must provide a stand alone trigger. The proposed trigger, presented in this article, will have the capability to detect photons with energy above 4 GeV with an efficiency of about 100%. The hardware implementation comprises an analog section, comparing the photomultiplier signal with a given threshold, and a digital section applying the trigger selection algorithm.
1 :  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique