Speaker
Description
Optics errors from the interaction points of the LHC, where β is most strongly squeezed, can significantly impact machine performance and protection. In anticipation of the HL-LHC, correction strategies extending up to dodecapole order are being targeted. Direct measurement of high-order resonance driving terms (RDTs) remains challenging, however. Applying crossing angle orbit bumps in the experimental insertions induces feed-down from higher-order errors, increasing the magnitude of lower-order RDTs. Leveraging this effect, a novel correction scheme based on RDT feed-down was implemented for the first time in 2025. Skew-octupole errors were successfully corrected, which enabled optics measurements at the collisions working point, down to an unprecedented level of β=18cm. Measurements of feed-down from dodecapole errors, to decapole RDTs were also achieved, opening a practical pathway to efficient corrections of very high-order optics errors.
| In which format do you inted to submit your paper? | LaTeX |
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