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T: Fachverband Teilchenphysik

T 91: Experimentelle Methoden der Astroteilchenphysik IV

T 91.1: Vortrag

Donnerstag, 22. März 2018, 16:30–16:45, Z6 - SR 2.011

Characterization tests of the photomultipliers for XENONnT — •Oliver Wack for the XENON collaboration — MPIK, Heidelberg, Germany

For the upgrade of XENON1T to the XENONnT TPC, about 300 additional photomultipliers (PMTs) are required. The Hamamatsu R11410-21 PMT was chosen for XENON1T due to its very low intrinsic radioactivity and high quantum efficiency. Recent investigations on light emission from within the tube led to slight improvements in the design of the new PMTs for XENONnT. In addition to the characterization test performed before, the procedure is improved in order to identify possible vacuum losses at cryogenic temperatures. This includes several cooling cycles to also investigate the stability of the dark-count-rate and effects of light-emission during cryogenic operation. The possible leakage into the tube is identified by a change in the after-pulse spectra before and after cooling.

This talk will also cover the performance of the PMTs during the operation in XENON1T.