Third Level Trigger for the Fluorescence Telescopes of the Pierre Auger Observatory

Details Third Level Trigger for the Fluorescence Telescopes of the Pierre Auger Observatory Third Level Trigger for the Fluorescence Telescopes of the Pierre Auger Observatory

2008-07-28

arxiv.org/abs/0807.4421v2

Nucl.Instrum.Meth.A601:347-353,2009

Astronomy and Astrophysics

Astrophysics

8 pages, 7 figures, to be published in NIM A; 1 typo corrected

Scientific paper

10.1016/j.nima.2009.01.002

The trigger system for the Auger fluorescence telescopes is implemented in hard- and software for an efficient selection of fluorescence light tracks induced by high-energy extensive air showers. The algorithm of the third stage uses the multiplicity signal of the hardware for fast rejection of lightning events with above 99% efficiency. In a second step direct muon hits in the camera and random triggers are rejected by analyzing the space-time correlation of the pixels. The trigger algorithm was tested with measured and simulated showers and implemented in the electronics of the fluorescence telescopes. A comparison to a prototype trigger without multiplicity shows the superiority of this approach, e.g. the false rejection rate is a factor 10 lower.

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