PMT characterisation for the KM3NeT project

The KM3NeT project aims to design and to construct at least a cubic kilometre scale neutrino telescope in the Mediterranean Sea. The main task is to instrument this deep-sea water volume with optical modules, each housing one or several photomultiplier tubes. Three-, 8- and 10-in. PMTs from ET Enterprises, Hamamatsu and MELZ-FEU have been investigated as candidates for the telescopeʹs optical modules. Various parameters of these photomultiplier tubes have been measured in a test bench at the Erlangen Centre for Astroparticle Physics. These results are presented.