# Waterproofed Photomultiplier Tube Assemblies for the Daya Bay Reactor Neutrino Experiment

**Authors:** Ken Chow, John Cummings, Emily Edwards, William Edwards, Ry Ely, Matthew Hoff, Logan Lebanowski, Bo Li, Piyi Li, Shih-Kai Lin, Dawei Liu, Jinchang Liu, Kam-Biu Luk, Jiayuan Miao, Jim Napolitano, Juan Pedro Ochoa-Ricoux, Jen-Chieh Peng, Ming Qi, Herbert Steiner, Paul Stoler  
**arXiv:** [1502.06652](https://arxiv.org/abs/1502.06652)  
**Date:** 2015-02-23  
**Summary page:** https://www.summarizepaper.com/en/paper/1502.06652v1/

## Abstract

In the Daya Bay Reactor Neutrino Experiment 960 20-cm-diameter waterproof photomultiplier tubes are used to instrument three water pools as Cherenkov detectors for detecting cosmic-ray muons. Of these 960 photomultiplier tubes, 341 are recycled from the MACRO experiment. A systematic program was undertaken to refurbish them as waterproof assemblies. In the context of passing the water leakage check, a success rate better than 97% was achieved. Details of the design, fabrication, testing, operation, and performance of these waterproofed photomultiplier-tube assemblies are presented.