An FPGA based second level trigger for the H.E.S.S 28 meter telescope

Details An FPGA based second level trigger for the H.E.S.S 28 meter telescope An FPGA based second level trigger for the H.E.S.S 28 meter telescope

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apsp.conf..293m&link_type=abstract

ASTROPARTICLE, PARTICLE AND SPACE PHYSICS, DETECTORS AND MEDICAL PHYSICS APPLICATIONS. Proceedings of the 11th Conference. Held

Physics

Medical Physics

Scientific paper

The H.E.S.S. experiment is an array of four 12 meter Imaging Atmospheric Cherenkov Telescopes (CT) working in stereoscopic mode. A fifth 28 meter telescope (LCT) will be added to the array in 2010 which will enable to lower the system's energy threshold in stereoscopy down to ≈ 50 GeV. However, the faster electronics of the LCT should allow it to handle higher Level 1 trigger rates than the CTs and hence collect even lower energy gamma events. But lowering the L1 trigger conditions will also result in a larger number of false detections, night sky background (NSB) essentially. The second level (L2) trigger was designed for the LCT to detect valuable gamma events amidst spurious L1 detections, to enable a higher L1 trigger input rate while keeping the data acquisition output rate within specifications. The selection algorithm of the L2 trigger is given. A realtime implementation is proposed and the L2 trigger reconfigurable hardware is described.

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