Calibration Module for the Light-Readout System of a Prototype Liquid-Argon Time-Projection Chamber

This paper presents a design of a calibration system for the Light Readout System of the prototype modular Liquid Argon Time-Projection Chamber (LArTPC) of the Near Detector of the Deep Underground Neutrino Experiment (DUNE). The calibration system and its components have been tested at the Joint Institute for Nuclear Research (JINR) and during the prototype LArTPC trials conducted at the University of Bern, Switzerland. The results demonstrate that the system fulfills its intended functionality, allowing for the calibration of the photodetectors in the light-readout system of the LArTPC and the study of its temporal characteristics.