Veritas CFDs

Physics

Scientific paper

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Scientific paper

The Level 1 (pixel) trigger of a VERITAS telescope is described. The trigger uses a constant fraction discriminator (CFD) to decrease VERITAS operation energy threshold by reducing the coincidence resolving time between neighb oring pixels to ˜ 5 ns. We discuss the optimization of the CFD design as well as ˇ unique requirements of the CFD application in a Imaging Atmospheric Cerenkov telescope (IACT). We describe a novel feedback circuit to provide real time optimization of CFD performance under variable NSB conditions. Tests of the Level 1 trigger demonstrate jitter < 1 ns with background noise values up to 0.8 pe/ns.

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