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

Baudis, L.; D'Amato, S.; Kessler, G.; Kish, A.; Wulf, J.

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

Sep 14, 2015

10 pages

e-Print:

1509.04055 [physics.ins-det]

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Abstract: (arXiv)

The Hamamatsu R11410 and R8520 photomultiplier tubes (PMTs) are designed for applications in dark matter detectors using liquid xenon, featuring excellent sensitivity to VUV light and stable operability at cryogenic temperatures. For eleven R11410 and seven R8520 PMTs, we measured the relative photo-detection sensitivity at 470nm as a function of the position of the incident light on the photocathode. Considering 80% of the photocathode surfaces, the observed non-uniformity values are in the ranges of (5-10)% and (25-30)% for the R11410 and R8520 models, respectively. We found that the non-uniformity in the inner region of the photocathode surface is dominated by light reflections on the internal components of the photosensors and that the border regions contribute dominantly to the observed non-uniformity.

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