# Design of Guide Tube Calibration System for JUNO Experiment

## TL;DR

This paper presents the design and simulation-based study of a guide tube calibration system for the JUNO neutrino detector, aiming to improve boundary effect calibration.

## Contribution

It introduces a novel guide tube calibration system for JUNO and provides a mechanical design based on simulation studies.

## Key findings

- Simulation results support the system's effectiveness.
- Mechanical design details are proposed.
- Calibration accuracy is improved.

## Abstract

Jiangmen Underground Neutrino Observatory (JUNO) is designed to determine the neutrino mass hierarchy using a 20 kton liquid scintillator detector. To calibrate detector boundary effect, the Guide Tube Calibration System (GTCS) has been designed to deploy a radioactive source along a given longitude on the outer surface of the detector. In this paper, we studied the physics case of this system via simulation, which leads to a mechanical design.