Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 612, Issue 2, Pages 278-287Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2009.10.107
Keywords
Gamma-ray astronomy; Photomultiplier tube; LED; Calibration system
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Funding
- Natural Sciences and Engineering Research Council (NSERC)
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We describe a flasher system designed for use in monitoring the gains of the photomultiplier tubes used in the VERITAS gamma-ray telescopes. This system uses blue light-emitting diodes (LEDs) so it can be operated at much higher rates than a traditional laser-based system. Calibration information can be obtained with better statistical precision with reduced loss of observing time. The LEDs are also much less expensive than a laser. The design features of the new system are presented, along with measurements made with a prototype mounted on one of the VERITAS telescopes. (C) 2009 Elsevier B.V. All rights reserved.
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