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The IceCube Upgrade will expand the IceCube Neutrino Observatory with nearly800 new optical modules. A large fraction of these will be multi-PMT opticalmodules (mDOMs), featuring 24 PMTs pointing uniformly in all directions,providing an almost homogeneous angular coverage and providing an effectivephotosensitive area more than twice that of current IceCube optical modules.Two PMT models from different manufacturers are currently considered for use inthe mDOM: a 3.5 inch PMT from HZC Photonics and a 3 inch PMT from Hamamatsu.Both PMTs have been characterized in terms of gain, timing, quantum efficiencyand dark noise rate as a function of temperature. The obtained characterizationresults are presented here.

Characterization of Two PMT Models for the IceCube Upgrade mDOM