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We present a detailed characterisation of the new Hamamatsu R12199-01 HA MOD3-inch photomultiplier tube (PMT) which is under consideration for the use insegmented optical modules of deep-ice neutrino detectors at the South Pole.Because of the significantly lower operation-temperature range compared tostandard applications, a focus of our studies lies on the investigation of thetemperature dependence of background characteristics (dark count rate,probability of correlated pulses), timing properties, gain and peak-to-valleyratio of this PMT type. In addition, the performance of the `HA coating'intended for background reduction was tested, as well as the influence ofconductive objects near the photocathode like reflectors on the PMT noise rate.A low background rate is of particular importance as the deep ice at the SouthPole features negligible optical background. We find that the new PMT type iswell suited for the intended applications.

Characterisation of the Hamamatsu R12199-01 HA MOD photomultiplier tube for low temperature applications