The calibration house in JUNO

TL;DR

This paper describes the design and implementation of a calibration house for the JUNO neutrino observatory, focusing on interface functionality and radon/oxygen level control to ensure experimental integrity.

Contribution

It introduces a specialized calibration house with effective interface connections and novel methods for controlling radon and oxygen levels in the JUNO experiment.

Findings

Calibration house interfaces effectively connect to the central detector.

Radon levels are maintained below 15 mBq/m$^{3}$.

Oxygen levels are kept below 10 ppm.

Abstract

As an auxiliary system within the calibration system of the Jiangmen Underground Neutrino Observatory, a calibration house is designed to provide interfaces for connecting the central detector and accommodating various calibration sub-systems. Onsite installation has demonstrated that the calibration house interfaces are capable of effectively connecting to the central detector and supporting the installation of complex and sophisticated calibration sub-systems. Additionally, controlling the levels of radon and oxygen within the calibration house is critical. Radon can increase the experimental background, while oxygen can degrade the quality of the liquid scintillator. The oxygen concentration can be maintained at levels below 10 parts per million, and the radon concentration can be kept below 15 mBq/m$^{3}$. This paper will provide detailed information on the calibration house and its methods for radon and oxygen concentration control.