Freiburg 2008 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 90: Experimentelle Methoden der Astroteilchenphysik I

T 90.4: Vortrag

Montag, 3. März 2008, 17:30–17:45, KGI-HS 1016

Analysis of the Monitoring Data of the Pierre Auger Surface Detector — •Giovanni Alcocer, Ivor Fleck, and Rodica Tcaciuc — Universität Siegen, Fachbereich Physik, Walter-Flex-Str.3, 57068 Siegen

The Surface Detector of the Pierre Auger Observatory consists of 1600 water Cherenkov tanks sampling ground particles of air showers produced by energetic cosmic rays. Every water tank is equipped with three photomultipliers (PMTs).

Every 7 minutes monitoring data are recorded from each surface detector to ensure that they are performing as intended and also to understand the detector behavior. The monitoring data set is used to study the evolution of parameters of the PMTs such as vertical equivalent muon (VEM) peaks, pedestal values, dynode/anode ratios, time over threshold triggers, VEM area/peak ratios as a function of both time and temperature.

The objective of this work is to monitor the stability of the PMTs. In case there is abnormal behavior detected, an alarm entry is created in the database. The classification of the alarms into different categories, corresponding to the observed patterns of the above mentioned variables and the decision of the alarm level are subject of this work.