2015 availability summary

This paper presents an overview on LHC availability in 2015, covering the period from 6 th April to 13 th December. The reference data-set for the presented results is coming from the Accelerator Fault Tracker (AFT), which was used in 2015 by members of the Availability Working Group for availability tracking. The main contributors to LHC downtime (Cryogenic system, Power Converters, Quench Protection System) are analysed in detail in the paper, highlighting relevant dependencies on other systems and operational modes. The concept of the availability matrix is introduced to describe the performance of hardware systems. The presented availability studies focus on the 25 ns and Ion Run in 2015, to derive reference figures for the upcoming 2016 Run.