The Jiangmen Underground Observatory (JUNO) is a 20-kton liquid scintillator detector that employs 20,000 20-inch photomultiplier tubes (PMTs) as photon sensors, with 5,000 dynode-PMTs from HAMAMATSU Photonics K.K. (HPK), and 15,000 MCP-PMTs from North Night Vision Technology (NNVT) installed in pure water. JUNO aims to provide long-lasting and the best performance operation by utilizing a high-transparency liquid scintillator, high detection efficiency PMTs, and specially designed electronics including water-proof potting for the high voltage (HV) dividers of PMTs. In this paper, we present a summary of the design and optimization of HV dividers for both types of 20-inch PMTs, which includes collection efficiency, charge resolution, HV divider current, pulse shape, and maximum amplitude restriction. We have developed and finalized four schemes of the HV divider for different scenarios, including the final version selected by JUNO. All 20,000 20-inch PMTs have successfully undergone production and burning tests.
@article{arxiv.2307.10544,
title = {Design & Optimization of the HV divider for JUNO 20-inch PMT},
author = {Feng-Jiao Luo and Zhi-Min Wang and An-Bo Yang and Yue-Kun Heng and Zhong-Hua Qin and Mei-Hang Xu and Sen Qian and Shu-Lin Liu and Yi-Fang Wang and Wei Wang and Alexander Olshevskiy and Guo-Rui Huang and Zhen Jin and Ling Ren and Xing-Chao Wang and Shu-Guang Si and Jian-Ning Sun},
journal= {arXiv preprint arXiv:2307.10544},
year = {2024}
}