HAL : in2p3-00280691, version 1
 DOI : 10.1109/TNS.2008.918517
 IEEE Transactions on Nuclear Science 55 (2008) 817-821
 The Electromagnetic Calorimeter Trigger System for the AMS-02 Experiment
 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.
 Thème(s) : Physique/Astrophysique/Cosmologie et astrophysique extra-galactiquePlanète et Univers/Astrophysique
 in2p3-00280691, version 1 http://hal.in2p3.fr/in2p3-00280691 oai:hal.in2p3.fr:in2p3-00280691 Contributeur : Nicole Berger <> Soumis le : Lundi 19 Mai 2008, 14:56:31 Dernière modification le : Mardi 20 Mai 2008, 10:07:49