Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....5.2851h&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
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.
Hall Jennifer
Kieda David B.
Moses Jeffrey
Nagai Takaya
Smith Jeffrey J.
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