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The Hamamatsu R11410 and R8520 photomultiplier tubes (PMTs) are designed forapplications in dark matter detectors using liquid xenon, featuring excellentsensitivity to VUV light and stable operability at cryogenic temperatures. Foreleven R11410 and seven R8520 PMTs, we measured the relative photo-detectionsensitivity at 470nm as a function of the position of the incident light on thephotocathode. Considering 80% of the photocathode surfaces, the observednon-uniformity values are in the ranges of (5-10)% and (25-30)% for the R11410and R8520 models, respectively. We found that the non-uniformity in the innerregion of the photocathode surface is dominated by light reflections on theinternal components of the photosensors and that the border regions contributedominantly to the observed non-uniformity.

Measurements of the position-dependent photo-detection sensitivity of the Hamamatsu R11410 and R8520 photomultiplier tubes