Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 44: Experimentelle Methoden der Astroteilchenphysik II

T 44.5: Talk

Tuesday, March 20, 2018, 17:30–17:45, Z6 - SR 2.013

Background light sources in photomultiplier tubes operated at negative HV — •Florian Trittmaack, Lew Classen, and Alexander Kappes for the IceCube collaboration — Westfälische Wilhelms-Universität Münster, Institut für Kernphysik, Deutschland

A significant sensitivity gain for future neutrino telescopes at the South Pole is anticipated to come from new optical sensor designs. One such design is the Multi-PMT Digital Optical Module (mDOM), which incorporates 24 3" photomultipliers (PMTs). Due to the low level of optical background in the deep ice, the dominant background is produced by the optical modules themselves with the PMTs being major sources. After an introduction to mechanisms of dark rate production inside a PMT, the talk presents investigations to characterize and identify the major sources for the 3 PMTs operated with negative high volatge used in the mDOM and possible ways to reduce it.