The water system and radon measurement system of Jiangmen Underground Neutrino Observatory

TL;DR

This paper describes the design and implementation of the water and radon measurement systems for the Jiangmen Underground Neutrino Observatory, focusing on maintaining water purity and radon removal to ensure low background noise for neutrino detection.

Contribution

It introduces the radon removal and measurement systems specifically developed for JUNO's water purification needs, highlighting their design and radon removal limits.

Findings

Radon removal system effectively reduces radon levels in water.

The water purification system maintains high water quality for neutrino detection.

Radon measurement system accurately monitors radon concentrations.

Abstract

The Jiangmen Underground Neutrino Observatory (JUNO), a 20ktons multi-purpose underground liquid scintillator detector, was proposed with the determination of the neutrino mass hierarchy as a primary physics goal. Due to low background requirement of the experiment, a multi-veto system ,which consists of a water Cherenkov detector and a top tracker detector, is required. In order to keep the water quality good and remove the radon in the water, a ultra-pure water system, a radon removal system and radon concentration measurement system have been designed. In this paper, the radon removal equipments and its radon removal limit will be presented.