Studies for the SPS Travelling Wave Cavities Upgrade

P. Kramer & C. Vollinger
The Super Proton Synchrotron\,(SPS) 200\,MHz accelerating system poses an intensity limitation for the planned High Luminosity\,(HL)-LHC upgrade due to excessive beam loading as well as higher-order modes\,(HOMs) contributing to a longitudinal multi-bunch instability. The mitigation of these HOMs together with a shortening of the cavities is therefore an essential part of the LHC Injectors Upgrade\,(LIU) project. A brief introduction to the accelerating structure as well as its present and future cavity configurations is given. First...
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