Availability projections for the CERN injector complex following the LHC Injectors Upgrade

One of the main goals of the CERN Long-Shutdown 2 (LS2) is to improve the performance of the injector complex, both regarding beam quality and availability, in the framework of the LHC Injectors Upgrade (LIU) project [1]. The project consists of major upgrades in all CERN machines, starting with the replacement of Linac2 by Linac4 as the first element in the injector chain. This will allow increasing the injection energy into the PSB from 50 to 160 MeV. Linac4 will accelerate H- ions, which will require a complete re-design of the PSB injector region, including the new charge-exchange stripping foil system. Thanks to the upgrades of the PSB rings, its output energy will be increased to 2 GeV. As a result, the PS injection region will also be upgraded, together with the PS RF system. The SPS will also undergo major upgrades involving several technical systems. As a result of these changes, the injector complex will be widely renovated, posing new challenges for operation of a new machine (Linac4) and systems. All improvements described above will be a fundamental step towards the increased luminosity production expected in the High-Luminosity LHC era, starting after LS3. In this context the performance of the injector complex will become even more important, as due to the exploitation of luminosity levelling the optimal LHC fill length will become shorter, resulting in more frequent injections. In this note we review the availability performance of the proton injector complex in the years 2017-2018, based on statistics extracted from the Accelerator Fault Tracker (AFT) [2], and discuss the possible availability performance of the injector complex during Run 3 and beyond.