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

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arxiv 2003.00140 v5 pith:BGIX5UVP submitted 2020-02-29 physics.acc-ph

Sofia Kostoglou , Gianluigi Arduini , Leandro Intelisano , Yannis Papaphilippou , Guido Sterbini This is my paper · ORCID
classification physics.acc-ph
keywords beamharmonicscolliderhadronlargepowerspectrumtransverse
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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 been observed in the transverse beam spectrum. This paper presents an overview of the most important observations, collected during the latest physics operation of the LHC in 2018, which clearly indicates that the harmonics are the result of a real beam excitation rather than an instrumental feature. Based on these findings, potential sources of the perturbation are discussed and a correlation with power supply ripple originating from the magnets' power supplies is presented.

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