Göttingen 2012 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 109: Niederenergie-Neutrinophysik/Suche nach Dunkler Materie 4
T 109.2: Vortrag
Dienstag, 28. Februar 2012, 17:05–17:20, ZHG 103
The GERDA calibration system — Laura Baudis, Francis Froborg, Michael Tarka, Tobias Bruch, Alfredo Ferella, and •Manuel Walter for the GERDA-Collaboration — Physik-Institut, Universität Zürich, Schweiz
A system with three identical custom made units is used for the energy calibration of the GERDA Ge diodes. To perform a calibration the 228Th sources are lowered from the parking positions at the top of the cryostat. Their positions are measured by two independent modules. One, the incremental encoder, counts the holes in the perforated steel band holding the sources, the other measures the drive shaft’s angular position even if not powered.
The system can be controlled remotely by a Labview program.
The calibration data is analyzed by an iterative calibration algorithm determining the calibration functions for different energy reconstruction algorithms and the resolution of several peaks in the 228Th spectrum is determined.
A Monte Carlo simulation using the GERDA simulation software MAGE has been performed to determine the background induced by the sources in the parking positions.