Detector Time Offset and Off-line Calibration in EAS Experiments

Details Detector Time Offset and Off-line Calibration in EAS Experiments Detector Time Offset and Off-line Calibration in EAS Experiments

2007-01-25

arxiv.org/abs/physics/0701291v1

Astropart.Phys.27:528-532,2007

Physics

Instrumentation and Detectors

9 pages, 5 figures, submitted to Astroparticle Physics

Scientific paper

10.1016/j.astropartphys.2007.03.

In Extensive Air Shower (EAS) experiments, the primary direction is reconstructed by the space-time pattern of secondary particles. Thus the equalization of the transit time of signals coming from different parts of the detector is crucial in order to get the best angular resolution and pointing accuracy allowed by the detector. In this paper an off-line calibration method is proposed and studied by means of proper simulations. It allows to calibrate the array repeatedly just using the collected data without disturbing the standard acquisition. The calibration method is based on the definition of a Characteristic Plane introduced to analyze the effects of the time systematic offsets, such as the quasi-sinusoidal modulation on azimuth angle distribution. This calibration procedure works also when a pre-modulation on the primary azimuthal distribution is present.

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