Studies for a Level 2 Trigger for H.E.S.S. Phase 2

Tluczykont, Martin
February 2005
AIP Conference Proceedings;2005, Vol. 745 Issue 1, p785
Conference Proceeding
The first phase of the H.E.S.S. experiment is completed with 4 telescopes fully operational since December 2003. After a very successful beginning with many sources detected, the second phase of the experiment is being planned. The objective is to build a very large telescope in the center of the array of the 4 existing ones. Operating the very large telescope in coincidence (stereoscopy) with the 4 H.E.S.S. I telescopes allows to reduce the energy threshold from 100 GeV to 50 GeV. In order to make optimum use of an additional very large telescope and to lower the energy threshold further, one has to consider the single telescope events of this telescope as well. The data acquisition of these events requires a second level trigger for the reduction of the data flow. The concepts for the realization and first results for a second level trigger are presented. © 2005 American Institute of Physics


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