1. The electromagnetic calorimeter trigger system for the AMS-02 experiment
- Author
-
Cadoux, F., Cervelli, F., Coignet, G., Cougolat, G., Di Falco, S., Goy, C., Hermel, R., Kossakowski, R., Incagli, M., Li, Z.H., Lu, Y.S., Magazzu, C., Pedreschi, E., Piendibene, M., Pilo, F., Pochon, J., Rosier-Lees, S., Spinella, Franco, Vannini, C., and Vialle, J.P.
- Subjects
Calorimeters -- Design and construction ,Cosmic rays -- Properties ,Photons -- Properties ,Radiation -- Measurement ,Radiation -- Methods ,Business ,Electronics ,Electronics and electrical industries - 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.sup.+], [e.sup.-] 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. Index Terms--DAQ, electronics, trigger.
- Published
- 2008