Optics measurements at the LHC are mainly based on turn-by-turn signal from hundreds of
beam position monitors (BPMs). Faulty BPMs produce erroneous signal causing unreliable …

Magnetic field errors and misalignments cause optics perturbations, which can lead to
machine safety issues and performance degradation. The correlation between magnetic …

The first year of Run 3 of the Large Hadron Collider (LHC) revealed significant changes in
both linear and nonlinear optics errors with respect to Run 2. Several iterations of optics …

Run 4 will be the first operational run of the LHC with full deployment of the upgrades from
the High Luminosity (HL-LHC) project planned for 2026-2028 (Long Shutdown 3). The …

Optics Measurement and Correction Strategies for HL-LHC Page 1 CERN-ACC-2022-0004
22/01/2024 CERN-ACC-2022-0004 . rogelio.tomas@cern.ch Optics Measurement and …

The achromatic telescopic squeezing (ATS) scheme has brought an essential conceptual
foundation to the HL-LHC project, making possible a strong and clean (achromatic) …

Amplitude detuning at end-of-squeeze is measured during this MD, with both flat-orbit and
crossingangles in IP5. These measurements are conducted to be able to identify the source …

A precise determination of the β function at different locations of an accelerator is essential
to allow accurate optics correction and to ensure high machine performance. The β function …

The correction of the local optics at the Interaction Regions of the LHC is crucial to ensure a
good performance of the machine. This is even more important for the future LHC upgrade …

Finding a truly local observable for perturbations of the linear beam dynamics is a nontrivial
task, contrary to the nonlinear regime, where local resonance driving terms already exist …