Speaker
Description
Precise optics control around the main interaction regions of the HL-LHC is essential to reach the target values of $\beta^*$ and the collider's nominal performance, while maintaining sufficient beam aperture and satisfying machine protection constraints. The field quality of the high-luminosity insertion-region magnets is critical for the accelerator performance, possibly impacting the achievable integrated luminosity. In this context, magnet sorting strategies, i.e. the allocation of a compatible slot in the tunnel based on the actual magnet properties, such as the transfer function and magnet field quality, can provide an effective handle to improve both linear and non-linear optics performance of the upgraded insertion regions. This work focuses on the Q2 magnets of the HL-LHC inner triplets, which are built at CERN and for which sorting remains a feasible option, as it is compatible with production and installation schedules. The effectiveness and trade-offs of these approaches are studied using a combination of analytical calculations and full HL-LHC lattice simulations. The results of the studies performed lead to an effective sorting recommendation for the Q2 units, which is adopted for the installation and operation in the HL-LHC era.
Funding Agency
Research supported by the HL-LHC project
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