Semi-intelligent trigger-generation scheme for Cherenkov light imaging cameras

Details Semi-intelligent trigger-generation scheme for Cherenkov light imaging cameras Semi-intelligent trigger-generation scheme for Cherenkov light imaging cameras

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994nimpa.340..413b&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 340, Issue 2, p. 413-419.

Physics

12

Scientific paper

We propose here an improved trigger-generation scheme for TeV gamma-ray imaging telescopes. Based on a memory-based Majority Coincidence Circuit, this scheme involves deriving two- or three-pixel nearest-neighbour coincidences as against the conventional approach of generating prompt coincidences using any two photomultiplier detector pixels of an imaging-camera. As such, the new method can discriminate better against shot-noise-generated triggers and, to a significant extent, also against cosmic-ray and local-muon-generated background events, without compromising on the telescope response to events of γ-ray origin. An optional feature of the proposed scheme is that a suitably scaled-up value of the chance-trigger rate can be independently derived, thereby making it possible to use this parameter reliably for keeping a log of the ``health'' of the experimental system.

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