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T: Fachverband Teilchenphysik
T 28: Niederenergie Neutrinophysik II
T 28.2: Vortrag
Montag, 9. März 2015, 17:00–17:15, I.12.01 (HS 30)
In-situ measurement of the light attenuation in liquid argon in the GERDA cryostat — •Birgit Schneider for the GERDA collaboration — IKTP, TU Dresden, Germany
GERDA is an experiment searching for neutrinoless double beta decay in 76Ge. It uses germanium detectors which are enriched in 76Ge and operates them naked in liquid argon (LAr), which serves both as a coolant and a shield for external radiation. For phase II of GERDA it is planned to reach an exposure of 100 kg · yr with a BI of 10−3 cts/(kg · yr · keV). One of the major improvements to further reduce the BI is to instrument the LAr to act as an additional background veto. The attenuation of the scintillation light in LAr creates a constraint on the effective active volume of the LAr veto and is therefore a key parameter to characterize the instrumentation.
In order to measure the light attenuation in LAr, a setup was designed that could be deployed directly into the GERDA cryostat. This setup contains a movable beta source and a PMT to detect the scintillation light at different distances.
The talk will describe in detail the construction of the setup, its successful deployment in the GERDA cryostat and the consecutive analysis of the acquired data.