BE Seminars

Studies of emittance growth due to noise in the Crab Cavity RF systems

by Natalia Triantafyllou (CERN)





(password 210473)


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 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 crab cavity radio-frequency (RF) system, which can result in considerable luminosity loss. 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 talk, the effects of transverse beam coupling impedance on emittance growth driven by crab cavity RF noise are presented along with the results of the second experimental campaign, which took place in the SPS in 2022.