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Since the beginning of the Large Hadron Collider (LHC) commissioning,spectral components at harmonics of the mains frequency (50 Hz) have beenobserved in the transverse beam spectrum. This paper presents an overview ofthe most important observations, collected during the latest physics operationof the LHC in 2018, which clearly indicates that the harmonics are the resultof a real beam excitation rather than an instrumental feature. Based on thesefindings, potential sources of the perturbation are discussed and a correlationwith power supply ripple originating from the magnets' power supplies ispresented.

Origin of the 50 Hz harmonics in the transverse beam spectrum of the Large Hadron Collider