Suppression of Crab Cavity Noise Induced Emittance Growth by Transverse Beam Coupling Impedance

Crab cavities are a key component of the High Luminosity LHC (HL-LHC) upgrade, as they aim to mitigate the luminosity reduction induced by the crossing angle. Two superconducting crab cavities (CCs) were installed in the Super Proton Synchrotron (SPS) at CERN in 2018 to demonstrate their operation i...

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Detalles Bibliográficos
Autores principales: Triantafyllou, Natalia, Antoniou, Fanouria, Bartosik, Hannes, Baudrenghien, Philippe, Buffat, Xavier, Calaga, Rama, Mastoridis, Themis, Papaphilippou, Yannis, Wolski, Andrzej
Lenguaje:eng
Publicado: 2022
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.18429/JACoW-IPAC2022-WEOZSP2
http://cds.cern.ch/record/2845897
Descripción
Sumario:Crab cavities are a key component of the High Luminosity LHC (HL-LHC) upgrade, as they aim to mitigate the luminosity reduction induced by the crossing angle. Two superconducting crab cavities (CCs) were installed in the Super Proton Synchrotron (SPS) at CERN in 2018 to demonstrate their operation in a proton machine for the first time. An important point to consider is the transverse emittance growth induced by noise in the CC RF system. During a first experimental campaign in 2018, the measured emittance growth was found to be a factor of 4 lower than predicted by analytical models. In this paper, the effects of transverse beam coupling impedance on emittance growth driven by CC RF noise are presented and the results of the second experimental campaign, which took place in the SPS in 2022, are discussed.

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