Optimization of the LHC beam cleaning system with respect to beam loss in the high luminosity insertions

The LHC design performance is achievable only with a dedicated beam cleaning system embedded in the lattice. The effect of the system on the beam loss distribution in the entire machine is studied with emphasis on the two high luminosity insertions. Realistic Monte-Carlo simulations are described, which include a model for beam halo interactions with collimators and other components, multi-turn particle tracking in the lattice, hadronic and electromagnetic shower simulations, and thermal and stress analyses. Methods to mitigate beam-induced effects in the interaction regions at operational and accidental beam loss are proposed, both for injection and collision conditions.