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Description
Transverse emittance growth can adversely affect the luminosity production performance of colliders such as the Large Hadron Collider (LHC) at CERN. While Intra-Beam Scattering (IBS) and Synchrotron Radiation (SR) effects represent important ingredients for the emittance evolution, measurements in the LHC do not match predictions from these two effects, suggesting the presence of additional emittance growth mechanisms. External excitations, such as power supply ripple and noise at 50 Hz harmonics, are additional sources of emittance growth especially in the presence of non-linearities as induced by beam-beam effects. In the LHC, the most prominent excitations during collisions are harmonics of 50 Hz clustered around 8 kHz. In this work, we quantify the expected contribution of these excitations to the emittance evolution and proton losses using single particle tracking simulations including a realistic excitation spectrum as observed in operation.
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