The High Voltage Splitter board for the JUNO SPMT system
Abstract
The Jiangmen Underground Neutrino Observatory (JUNO) in southern China is designed to study neutrinos from nuclear reactors and natural sources to address fundamental questions in neutrino physics. Achieving its goals requires continuous operation over a 20-year period. The small photomultiplier tube (small PMT or SPMT) system is a subsystem within the experiment composed of 25600 3-inch PMTs and their associated readout electronics. The High Voltage Splitter (HVS) is the first board on the readout chain of the SPMT system and services the PMTs by providing high voltage for biasing and by decoupling the generated physics signal from the high-voltage bias for readout, which is then fed to the front-end board. The necessity to handle high voltage, manage a large channel count, and operate stably for 20 years imposes significant constraints on the physical design of the HVS. This paper serves as a comprehensive documentation of the HVS board: its role in the SPMT readout system, the challenges in its design, performance and reliability metrics, and the methods employed for production and quality control.
Cite
@article{arxiv.2505.05586,
title = {The High Voltage Splitter board for the JUNO SPMT system},
author = {Pablo Walker and Juan Pedro Ochoa-Ricoux and Angel Abusleme and Agustin Campeny and Mathieu Bongrand and Clément Bordereau and José Busto and Anatael Cabrera and Stéphane Callier and Steven Calvez and Cédric Cerna and Thomas Chabot and Po-An Chen and Guoming Chen and Ziliang Chu and Gérard Claverie and Christophe De La Taille and Charles-Edouard Demonchy and Selma Conforti Di Lorenzo and Frédéric Druillole and Lei Fan and Amélie Fournier and Yang Han and Miao He and Patrick Hellmuth and Rafael Herrera and Yee Hsiung and Bei-Zhen Hu and Jun Hu and Guihong Huang and Yongbo Huang and Cédric Huss and Léonard Imbert and Adrienne Jacobi and Ignacio Jeria and Xiaoshan Jiang and Xiaoping Jing and Cécile Jollet and Jean Jouve and Sindhujha Kumaran and Loïc Labit and Sébastien Leblanc and Victor Lebrin and Matthieu Lecocq and Hongbang Liu and Kainan Liu and Xiwen Liu and Roberto Carlos Mandujano and Anselmo Meregaglia and Diana Navas-Nicolas and Zhe Ning and Yujie Niu and Frédéric Perrot and Rebin Karaparambil Rajan and Reem Rasheed and Abdel Rebii and Mathieu Roche and Cayetano Santos and Mariangela Settimo and Yunhua Sun and Jingzhe Tang and Giancarlo Troni and Benoit Viaud and Chung-Hsiang Wang and Jian Wang and Yangfu Wang and Zhimin Wang and Diru Wu and Jacques Wurtz and Wan Xie and Jilei Xu and Jinghuan Xu and Meihang Xu and Chengfeng Yang and Frédéric Yermia and Junwei Zhang and Siyuan Zhang},
journal= {arXiv preprint arXiv:2505.05586},
year = {2025}
}
Comments
25 pages, 39 figures, 5 tables. To be submitted to NIM-A