Failure analysis and lessons learned on crate and power supply equipment

Abstract For nearly 20 years, the Power Supply and Crate Service at CERN has been responsible for the maintenance tracking of power supplies and crates used by the CERN experiments. With this experience, and with the imminent introduction of a new generation of power supplies for the HL-LHC, the timing is ideal to conduct a statistical analysis to draw lessons from the past and make recommendations for the future. This study aims to analyze failures, expose the most vulnerable components, identify the improvement solutions, and highlight the benefits of preventive maintenance campaigns to ensure reliable long-term operation.