Experimental supervision tools software upgrade on the Laser Megajoule facility

The Laser MegaJoule, a 176-beam laser facility developed by CEA, is located near Bordeaux. It is part of the French Simulation Program, which combines improvement of theoretical models used in various domains of physics and high performance numerical simulation. It is designed to deliver about 1.4 MJ of energy on targets, for high energy density physics experiments, including fusion experiments. The LMJ technological choices were validated on the LIL, a scale-1 prototype composed of 1 bundle of 4-beams. The first bundle of 8-beams was commissioned in October 2014 with the first experiment on the LMJ facility. Operational capabilities increase gradually every year until the full completion by 2026. By the end of 2025, 22 bundles of 8-beams will be assembled and 19 bundles are expected to be fully operational. We present a successful modernization strategy of operational tools for the LMJ, enhancing usability and maintainability. Our efforts focused on replacing legacy systems, by migrating from a monolithic client application to a Django-React web app, providing a more accessible and maintainable interface. Additionally, we streamlined the XML tree-based configuration of calculation scenarios by migrating toward a robust PostgreSQL database. Furthermore, we overhauled our deployment process by using Ansible, increasing operational efficiency and consistency. Key words: Laser facility, LMJ, IT, Deployment, Data migration