Leakage Tests of the Stainless Steel Vessels of the Antineutrino Detectors in the Daya Bay Reactor Neutrino Experiment

TL;DR

This paper details the sealing techniques and leak testing results for the stainless steel vessels of the Daya Bay antineutrino detectors, crucial for their long-term water tightness during extended operation.

Contribution

It introduces a specific sealing method and employs three leak testing techniques to verify vessel integrity, ensuring detector reliability over years of operation.

Findings

Leak testing confirmed vessel water tightness

Sealing method effectively prevents leaks

Detectors are suitable for long-term operation

Abstract

The antineutrino detectors in the Daya Bay reactor neutrino experiment are liquid scintillator detectors designed to detect low energy particles from antineutrino interactions with high efficiency and low backgrounds. Since the antineutrino detector will be installed in a water Cherenkov cosmic ray veto detector and will run for 3 to 5 years, ensuring water tightness is critical to the successful operation of the antineutrino detectors. We choose a special method to seal the detector. Three leak checking methods have been employed to ensure the seal quality. This paper will describe the sealing method and leak testing results.