Speaker
Description
In the Large Hadron Collider (LHC), several beam diagnostic systems provide turn-by-turn and bunch-by-bunch position, enabling a precise characterization of the transverse beam spectra up to high frequency. Using these instruments, the presence of external excitations at 50 Hz harmonics have been observed to affect the beam motion. In this work, we combine these measurements to study the evolution of the noise content in the LHC, with particular focus on the 50 Hz harmonics clustered around 8 kHz, which corresponds to an important range of the transverse beam spectrum.
While the exact source of the excitation remains unknown, this study provides new insights into the mechanisms behind this excitation and the evolution of the harmonic lines along the LHC cycle based on statistics collected from operational physics fills in 2025.
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