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The Hamamatsu R11410-21 photomultiplier tube is the photodetector of choicefor the XENON1T dual-phase time projection chamber. The device has beenoptimized for a very low intrinsic radioactivity, a high quantum efficiency anda high sensitivity to single photon detection. A total of 248 tubes arecurrently operated in XENON1T, selected out of 321 tested units. In thisarticle the procedures implemented to evaluate the large number of tubes priorto their installation in XENON1T are described. The parameter distributions forall tested tubes are shown, with an emphasis on those selected for XENON1T, ofwhich the impact on the detector performance is discussed. All photomultipliershave been tested in a nitrogen atmosphere at cryogenic temperatures, with asubset of the tubes being tested in gaseous and liquid xenon, simulating theiroperating conditions in the dark matter detector. The performance andevaluation of the tubes in the different environments is reported and thecriteria for rejection of PMTs are outlined and quantified.

Qualification Tests of the R11410-21 Photomultiplier Tubes for the XENON1T Detector