Speaker
Description
In 2024, a measurement campaign was carried out using LHC-type single-bunch beams to study the dependence of beam losses and transverse emittance growth on the working point in the SPS. Tune scans across the horizontal and vertical planes revealed two unexpected resonances: a non-linear coupled resonance causing emittance growth in the horizontal plane and corresponding emittance decrease in the vertical plane, and another non-linear coupled resonance directly associated with particle losses. The latter is an octupolar resonance observed to impact beam transmission in multi-bunch, high-intensity beams. In 2025, loss maps were measured to confirm the presence of this resonance even for low brightness. Additional tune scans and Xsuite simulations were conducted to investigate possible lattice imperfections driving these resonances.
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