Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 107: Suche nach Dunkler Materie 3
T 107.6: Vortrag
Dienstag, 5. März 2013, 18:00–18:15, HSZ-103
PMT series tests for the XENON1T Water Cherenkov Muon Veto — •Christopher Geis — Institute of Physics, Johannes Gutenberg-Universität, Mainz, Germany
The XENON1T experiment will achieve a sensitivity for the spin-independent WIMP-nucleon elastic scattering cross section of 2·10−47 cm2 for the direct detection of Dark Matter, requiring a background reduction of two orders of magnitude compared to its predecessor XENON100.
Background consists of neutrons induced by cosmic ray muons penetrating the rock of the LNGS Underground laboratory, where the experiment will be located. Neutrons hitting the detector produce WIMP like signals. They can be vetoed during the passage of their parent muon through a 750 m3 Water Cherenkov Muon Veto surrounding the detector. To exploit the water as a Cherenkov medium the system will be equipped with R5912 high quantum efficiency 8 " Photomultipliertubes (PMTs) by Hamamatsu detecting the produced Cherenkov light.
84 PMTs will be arranged equally spaced in rings located at the top, bottom and lateral area of the water tank. To inspect the functionality of each PMT successive tests of their characteristics have to be performed, including estimation of basic parameters like dark rate and gain, as well as more in-depth properties like the number and position of afterpulses, caused by gaseous impurities in the PMTs evacuated glass bulb. We provide an overview of the Muon Veto system and the PMT performances.