# The Electromagnetic Calorimeter Trigger System for the AMS-02 Experiment

Abstract : 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.
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Journal articles
IEEE Transactions on Nuclear Science, Institute of Electrical and Electronics Engineers (IEEE), 2008, 55, pp.817-821. <10.1109/TNS.2008.918517>
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http://hal.in2p3.fr/in2p3-00280691
Contributor : Nicole Berger <>
Submitted on : Monday, May 19, 2008 - 2:00:56 PM
Last modification on : Tuesday, May 20, 2008 - 10:00:07 AM

### Citation

F. Cervelli, G. Coignet, G. Cougoulat, S. Di Falco, C. Goy, et al.. The Electromagnetic Calorimeter Trigger System for the AMS-02 Experiment. IEEE Transactions on Nuclear Science, Institute of Electrical and Electronics Engineers (IEEE), 2008, 55, pp.817-821. <10.1109/TNS.2008.918517>. <in2p3-00280691>

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