12-20 July 2017
Asia/Seoul timezone
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BEXCO - Room F(201/202/203/204)

[GA147] A Trigger Interface Board to manage trigger and timing signals in CTA Large-Sized Telescope and Medium-Sized Telescope camera


  • Marcos LOPEZ

Primary authors



One of the main goals of the Cherenkov Telescope Array (CTA) observatory is to improve the sensitivity by an order of magnitude, compared to the current ground-based gamma-ray observatories. Widening the energy coverage down to 20 GeV and up to 300 TeV is also an important goal. This goal will be possible by using Large-Sized Telescopes (LSTs) for the energy range 20-200 GeV, Medium-Sized Telescopes (MSTs) for the energy range 100 GeV - 10 TeV, and Small-Sized Telescopes (SSTs) for energies above 5 TeV. The LSTs, which focus on the lowest energies, are operated in a region dominated by background events originated by the night sky background. To reduce as much as possible such background events, the LST cameras are only readout if at least two of them have been triggered in a short time coincidence window. Such trigger is implemented for each LST camera in a dedicated module called Trigger Interface Board (TIB). In addition, the TIB is used in the LSTs and NectarCAM MSTs to manage their different trigger and timing signals, as well as to monitor the different counting rates and dead-time of the cameras. It also assigns a time stamp to each event, which is recorded along with the information provided by the CTA global timing distribution system, based on the White Rabbit protocol. Therefore, the event arrival time can be determined in a redundant way. In this contribution, the main features and the technical performance of the TIB will be presented.