Trigger electronics of the new Fluorescence Detectors of the Telescope Array Experiment

Details Trigger electronics of the new Fluorescence Detectors of the Telescope Array Experiment Trigger electronics of the new Fluorescence Detectors of the Telescope Array Experiment

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009nimpa.609..227t&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 609, Issue 2-3, p. 227-234.

Physics

3

Scientific paper

The Telescope Array Project is an experiment designed to observe Ultra High Energy Cosmic Rays via a “hybrid” detection technique utilizing both fluorescence light detectors (FDs) and scintillator surface particle detectors (SDs). We have installed three FD stations and 507 SDs in the Utah desert, and initiated observations from March 2008. The northern FD station reuses 14 telescopes from the High Resolution Fly's Eye, HiRes-I station. Each of the two southern FD stations contains 12 new telescopes utilizing new FADC electronics. Each telescope is instrumented with a camera composed of 256 PMTs. Since the detectors are composed of many PMTs and each PMT detects fluorescence photons together with the vast amount of night sky background, a sophisticated triggering system is required. In this paper, we describe the trigger electronics of these new FD stations. We also discuss performance of the FDs with this triggering system, in terms of efficiencies and apertures for various detector configurations.

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