Calibration Techniques for VERITAS

Details Calibration Techniques for VERITAS Calibration Techniques for VERITAS

2007-09-27

arxiv.org/abs/0709.4479v1

Astronomy and Astrophysics

Astrophysics

4 pages; contribution to the 30th International Cosmic Ray Conference, Merida, Mexico, July 2007

Scientific paper

VERITAS is an array of four identical telescopes designed for detecting and measuring astrophysical gamma rays with energies in excess of 100 GeV. Each telescope uses a 12 m diameter reflector to collect Cherenkov light from air showers initiated by incident gamma rays and direct it onto a `camera' comprising 499 photomultiplier tubes read out by flash ADCs. We describe here calibration methods used for determining the values of the parameters which are necessary for converting the digitized PMT pulses to gamma-ray energies and directions. Use of laser pulses to determine and monitor PMT gains is discussed, as are measurements of the absolute throughput of the telescopes using muon rings.

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