THE FINAL COLLIMATION SYSTEM FOR THE LHC

TLDR

The LHC collimation system was redesigned to meet the unprecedented challenges posed by 360 MJ, 7 TeV beams. The final design reserves 132 pure collimator sites in the two rings, installs up to 88 collimators of five types in a phased approach, and details the collimator functionalities and phased strategy to meet performance goals. The layout has been finalized, adopting a collimation and cleaning approach that fully optimizes protection against beam‑induced quenches and ensures component survival under radiation, with performance expectations summarized. Large Hadron Collider Project.

Abstract

The LHC collimation system has been re-designed over in order to address the unprecedented challenges that are faced with the 360 MJ beams at 7 TeV. The layout of the LHC has now been frozen and a final approach for collimation and cleaning has been adopted. In total 132 pure collimator locations have been reserved in the two LHC rings and can be installed in a phased approach. Up to 88 collimators of five different types will be available for initial beam operation. The system has been fully optimized for avoiding beam-induced quenches of superconducting magnets and for sufficient survival of beamline components against radioactive dose. The phased approach for LHC collimation is described, the various collimators and their functionalities are explained, and the expected system performance is summarized. Large Hadron Collider Project