The H.E.S.S. central data acquisition system
arXiv:1311.3486 · doi:10.1016/j.astropartphys.2013.11.007
Abstract
The High Energy Stereoscopic System (H.E.S.S.) is a system of Imaging Atmospheric Cherenkov Telescopes (IACTs) located in the Khomas Highland in Namibia. It measures cosmic gamma rays of very high energies (VHE; >100 GeV) using the Earth's atmosphere as a calorimeter. The H.E.S.S. Array entered Phase II in September 2012 with the inauguration of a fifth telescope that is larger and more complex than the other four. This paper will give an overview of the current H.E.S.S. central data acquisition (DAQ) system with particular emphasis on the upgrades made to integrate the fifth telescope into the array. At first, the various requirements for the central DAQ are discussed then the general design principles employed to fulfil these requirements are described. Finally, the performance, stability and reliability of the H.E.S.S. central DAQ are presented. One of the major accomplishments is that less than 0.8% of observation time has been lost due to central DAQ problems since 2009.
17 pages, 8 figures, published in Astroparticle Physics
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- The RTApipe framework for the gamma-ray real-time analysis software development
- High-energy gamma-ray studying with GAMMA-400
- H.E.S.S.: The High Energy Stereoscopic System
- Is PKS 0625-354 another variable TeV active galactic nucleus?
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