The trigger system of the Pierre Auger Surface Detector: operation, efficiency and stability

Allard, D.; Armengaud, E.; Allekotte, I.; Allison, P.; Aublin, J.; Ave, M.; Bauleo, P.; Beatty, J.; Beau, T.; Bertou, X.; Billoir, P.; Bonifazi, C.; Chou, A.; Chye, J.; Dagoret-Campagne, S.; Dorofeev, A.; Ghia, P. L.; Berisso, M. Gomez; Gorgi, A.; Hamilton, J. C.; Harton, J.; Knapik, R.; Lachaud, C.; Lhenry-Yvon, I.; Letessier-Selvon, A.; Matthews, J.; Medina, C.; Meyhandan, R.; Navarra, G.; Nitz, D.; Parizot, E.; Revenu, B.; Szadkowski, Z.; Yamamoto, T.

The trigger system of the Pierre Auger Surface Detector: operation, efficiency and stability

Authors

Description

The trigger system of the Surface Detector (SD) of the Pierre Auger Observatory is described, from the identification of candidate showers ($E>1$ EeV) at the level of a single station, among a huge background (mainly single muons), up to the selection of real events and the rejection of random coincidences at a higher central trigger level (including the reconstruction accuracy). Efficiency of a single station trigger is evaluated using real data , and the high performance of event selection hierarchy will be demonstrated.
4 pages, 2 figures, ICRC2005