Speaker
Mattia Stefanelli
(European Organization for Nuclear Research, National Institute for Subatomic Physics)
Description
The $3Q_y$ resonance is of particular concern at LHC injection given its potential to degrade the lifetime and the machine dynamic aperture. During measurements of the chromatic linear optics for the 2025 LHC commissioning, a large variation of the $3Q_y$ resonance strength at different momentum deviations $\delta$ was noticed. Further studies have been performed in order to assess the contribution to this variation from higher order multipoles, in particular from octupole and decapole fields. Benchmarking has been performed to the LHC magnetic model pointing to a large discrepancy in the skew-octupole sources present at injection. Methods and results of this analysis are presented in this work.
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Author
Mattia Stefanelli
(European Organization for Nuclear Research, National Institute for Subatomic Physics)
Co-author
Ewen Maclean
(European Organization for Nuclear Research)