Speaker
Description
The Quench Detection Systems (QDS) are essential for protecting the LHC superconducting magnets and circuits during quench events. During the upcoming Long Shutdown 3 (2026-2030), several of these systems will undergo major renovation, including those for Individually Powered Quadrupole and Dipole magnets and the Inner Triplets. To secure the continued high performance of machine protection elements, a comprehensive reliability analysis was performed to ensure the probability of critical failures leading to months of downtime meets stringent requirements, while minimizing the impact on machine availability.
Different system architectures were evaluated and compared. Optimized architectures were identified and fed back into the design, eliminating Single Points of Failure. Failure probabilities were estimated using analytical models that account for redundancy, inspection strategies, and demand frequencies. Results indicate that the reliability targets can be met both in operation and during magnet training campaigns, with and without additional power supplies, provided that reliable monitoring is in place and reacted upon. Yearly testing of the trigger connection to the quench heaters (DQHDS) is found to be sufficient.
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