The topological second-level trigger of the H.E.S.S. phase 2 telescope

Details The topological second-level trigger of the H.E.S.S. phase 2 telescope The topological second-level trigger of the H.E.S.S. phase 2 telescope

2010-12-08

arxiv.org/abs/1012.1755v1

Astropart.Phys.34:568-574,2011

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

accepted for publication in Astroparticle Physics

Scientific paper

10.1016/j.astropartphys.2010.12.

H.E.S.S is an array of atmospheric Cherenkov telescopes dedicated to GeV-TeV gamma-ray astronomy. The original array has been in operation since the beginning of 2004. It is composed of four 12-meter diameter telescopes. The installation of a fifth 28-meter diameter telescope is being completed. This telescope will operate both in stereoscopic mode and in monoscopic mode i.e. without a coincident detection on the smaller telescopes. A second-level trigger system is needed to supress spurious triggers of the 28-meter telescope when operated in monoscopic mode. This paper gives the motivation and principle of the second-level trigger. The principle of operation is illustrated by an example algorithm. The hardware implementation of the second level trigger system of H.E.S.S. phase 2 is described and its expected performances are then evaluated.

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