Operation and Upgrade of a LabVIEW-Based Control System for a Liquid Xenon Cryogenic R&D Platform

The nEXO ton-scale detector is designed to search for neutrinoless double beta decay in 90% enriched liquid xenon-136, with a projected half-life sensitivity of 1.35×10²⁸ years. Observing this decay would confirm the Majorana nature of neutrinos, demonstrating that neutrinos are their own antiparticle, and provide crucial insight into their absolute mass. The nEXO time projection chamber (TPC) features an array of silicon photomultipliers (SiPMs) to detect the VUV scintillation light of liquid xenon (LXe). At UMass Amherst, we operate a kilogram-scale LXe Cryogenic System to support R&D for nEXO and future LXe detectors. Our work focuses on testing VUV-sensitive SiPMs and studying vacuum ultraviolet (VUV)optics of a variety of reflector materials of interest for nEXO. A LabVIEW-based system is used to monitor and control cryogenic operations and for data acquisition. In this poster, I will illustrate the monitoring and operating capabilities of the UMass LXe system with data from xenon liquefaction runs. I will showcase upgrades I implemented to the control system to expand its capabilities and improve user interface and stability.