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Calibration of the detector is an important part of data acquisition process and the most important aspect of the
analysis. Essentially the calibration converts detector data (number of PMTs that fire, their location and time) to an event energy and direction. This conversion is complicated because the sensitivity of the
detector is position dependent and is different for electrons, gamma rays and neutrons. The calibrations must be frequently updated due to the possibility of drifting PMT gains and changes in the detector condition.
Ideally for calibration, one would use a strong portable source of high energy neutrinos. Since such a source is not possible, calibrations must be obtained by other means. The calibration of SNO will involve several
repetitive techniques using optical photons, gamma rays and beta sources until the detector is fully characterized. |
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