14-17 September 2021
America/Los_Angeles timezone

Improved quality tests of R11410-21 photomultiplier tubes

17 Sep 2021, 07:15
Light/charge readout (PMT, SiPM, WLS, electronics etc.) Light/Charge Readout (4A)


Luisa Hoetzsch (Max-Planck-Institut für Kernphysik)


Photomultiplier tubes (PMTs) are often used in low-background particle physics experiments, which rely on an excellent response to single-photon signals and stable long-term operation. In particular, the Hamamatsu R11410 model is the light sensor of choice for many detectors utilising xenon as target material. In the past, this PMT model has shown issues affecting its long-term operation, including light emission and the degradation of the PMT vacuum through small leaks, which can lead to spurious signals known as afterpulses. In this talk, we present an improved PMT testing procedure that includes newly developed tests targeted at the detection of intermittent light emission as well as vacuum degradation. The use of both new and upgraded facilities allowed us to test in total 368 new PMTs for the XENONnT detector in a cryogenic xenon environment. We exclude the use of 26 of the 368 tested PMTs and categorise the remainder according to their performance. Given that we have improved the testing procedure compared to XENON1T, yet we rejected fewer PMTs, we expect significantly better PMT performance in XENONnT.

Primary authors

Luisa Hoetzsch (Max-Planck-Institut für Kernphysik) Adam Brown (University of Freiburg) Joern Mahlstedt (Stockholm University) Vasile Cristian Antochi (Stockholm University) Laura Baudis (University of Zurich) Julian Bollig (University of Freiburg) Ranny Budnik (Weizmann Institute of Science) Dominick Cichon (Max-Planck-Institut für Kernphysik) Jan Conrad (Stockholm University) Alfredo Davide Ferella (University of L'Aquila) Michelle Galloway (University of Zurich) Shingo Kazama (Nagoya University) Gera Koltman (Weizmann Institute of Science) Hagar Landsman (Weizmann Institute of Science) Manfred Lindner (Max-Planck-Institut für Kernphysik) Teresa Marrodán Undagoitia (Max-Planck-Institut für Kernphysik) Bart Pelssers (Stockholm University) Giovanni Volta (University of Zurich) Oliver Wack (Max-Planck-Institut für Kernphysik) Julien Wulf (University of Zurich)

Presentation Materials