Speaker
Description
Studies conducted at CERN's Super Proton Synchrotron (SPS) in 2017 showed an asymmetric off-momentum acceptance for Q20 optics. A systematic mechanical limitation near the defocussing quadrupoles -- the most restrictive regions of the ring in the Q20 optics -- was suggested as a possible explanation for this asymmetry and was addressed during LS2. However, improvements were only observed in some of those locations. This paper aims to revisit this topic to identify potential bottlenecks and their causes. Additionally, some regions are more limiting than others despite having the same linear optics, which could be explained by aperture shifts, orbit misalignments, non-linear contributions of the lattice, or any combination of those. Measurements were performed at different locations by introducing orbit bumps and changing the frequency of the RF cavities, in order to identify the dominant bottleneck regions. In parallel, simulations were conducted to predict the location of the primary bottleneck and to reproduce the experimental data.
| In which format do you inted to submit your paper? | LaTeX |
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