Reconstruction of the SEY evolution during the 2022 LHC scrubbing run

During each long shutdown of the Large Hadron Collider (LHC), the surface of the beam screens are expected to decondition, favoring the formation of dense electron clouds, which generate high heat loads on the cryogenic system of the superconducting magnets. A scrubbing run took place soon after the restart of the LHC for Run 3 (2022) in order to recondition the beam screens and limit the electron cloud formation such that the induced heat loads can be handled by the cryogenic system. We performed electron cloud build-up simulations using real beam data extracted from the LHC logging system and inferred the Secondary Emission Yield (SEY) by comparing simulations with experimental measurements of heat load. The vast amount of data that is logged during the scrubbing run allowed the systematic study of the SEY and its evolution in different regions like the regular arc half-cells and the instrumented half-cells. Finally, a method was defined and used in order to disentangle the heat load contribution of the dipole and quadrupole magnets in a half-cell when only the total heat load is available.