Speaker
Description
Initially planned to start in 2021 and to end up in 2024, the third exploitation period of the LHC (Run 3) started in 2022 and was extended by two years to fit the adjusted schedule of the High Luminosity LHC (HL-LHC) project. Run 3 was not only marked by the exceptional performance of the machine (125 1/fb delivered in 2025 to the two high luminosity experiments ATLAS and CMS), but also used as an unique opportunity for the transition between the LHC and the HL-LHC, both in terms of optics and beam parameters, in particular with the smallest beta* of 18 cm put in operation so far, and the highest bunch charge of 1.8e11 protons/bunch now regularly used in operation. In order to make this transition as adiabatic as possible, the machine configuration was modified year by year, not only to profit as much as possible from the incremental increase of the bunch charge available at the exit of the injector chain, but also to mitigate as much as possible the radiation dose deposited in the inner triplet of the two high luminosity experiments ATLAS and CMS. This paper describes the main changes applied to the machine configuration over this period, together with the motivations.
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