PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Neutrino Astronomy & Physics (NU)
Long-term performance and its stability of Hyper-Kamiokande PMTs in the SK water tank from 2018 to present
Y. Yoshioka* and  On behalf of the Super-Kamiokande Collaboration
Full text: pdf
Pre-published on: August 18, 2023
Published on: September 27, 2024
Abstract
For the Hyper-Kamiokande experiment, a new 50 cm Box & Line type PMT (HAMAMATSU R12860: HK-PMT) has been developed. Using PMT dark hit data taken for 129 HK-PMTs, which have been installed in Super-Kamiokande since 2018, long-term measurements of the gain variation of the HK-PMTs in the water were performed for the first time. As a result, we observed a gain increase of +0.79±0.03%/year for HK-PMT.
DOI: https://doi.org/10.22323/1.444.1167
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