Characteristics of the Multi-Telescope Coincidence Trigger of the HEGRA IACT System

Details Characteristics of the Multi-Telescope Coincidence Trigger of the HEGRA IACT System Characteristics of the Multi-Telescope Coincidence Trigger of the HEGRA IACT System

1997-12-04

arxiv.org/abs/astro-ph/9712063v1

Astropart.Phys. 8 (1998) 223-233

Astronomy and Astrophysics

Astrophysics

17 Pages, 10 figures, Latex

Scientific paper

10.1016/S0927-6505(98)00003-6

The HEGRA--collaboration is operating a system of imaging atmospheric Cherenkov telescopes to search for sources of TeV-gamma-rays. Air showers are observed in stereoscopic mode with several telescopes simultaneously. To trigger the telescope system a versatile two-level trigger scheme has been implemented, which allows a significant reduction of the energy threshold with respect to single telescopes. The technical implementation of this trigger scheme and the performance of the trigger system are described. Results include the dependence of single- and multi-telescope trigger rates on the trigger thresholds, on the orientation of the telescopes, and on the type of the primary particle.

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