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T: Fachverband Teilchenphysik

T 17: Methods of astroparticle physics I

T 17.4: Vortrag

Montag, 30. März 2020, 17:15–17:30, H-HS XVII

Determination of the influence of magnetic fields on 3-inch PMTs — •Ken Ueberholz, Lew Classen, and Alexander Kappes for the IceCube collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster

The neutrino telescope IceCube uses Cherenkov light of secondary charged particles to detect neutrino interactions with the molecules of the ice. This light is detected by Digital Optical Modules (DOMs) each consisting of one large 10-inch photomultiplier tube (PMT) inside a glass pressure vessel. Magnetic fields have been found to have an impact on PMT properties such a timing precision and gain, therefore the PMTs are shielded by means of a mu-metal caging.

The upcoming IceCube Upgrade will introduce the mDOM to IceCube, a multi Digital Optical Module using 24 smaller 3-inch PMTs. For PMTs as small as 3-inch the influence of the Earth magnetic field was found to be weaker, so the mDOM is not foreseen to feature magnetic shielding.

In this work we investigated in more detail the impact of magnetic fields on PMT and output signal parameters as a function of orientation and strength of the field.