Beam-beam effects in the high-pile-up tests of the LHC

TL;DR

This paper investigates the beam-beam effects in the LHC, focusing on the head-on interactions and their influence on the beam's tune shift, which is vital for optimizing luminosity in high-pile-up conditions.

Contribution

It provides experimental insights into the maximum tune shift caused by head-on beam-beam interactions during high-pile-up tests in the LHC.

Findings

Maximum tune shift observed during tests

Head-on interactions significantly impact beam stability

Results inform luminosity optimization strategies

Abstract

Investigating the beam-beam limit in the LHC is of great importance, since identifying its source is crucial for the luminosity optimization scenario. Several experiments were carried out to search for this limit and check whether it is dominated by the head-on (HO) or the long-range (LR) interactions. In this paper only the HO collision effects will be considered, tracking the evolution of the maximum tune shift achieved during the dedicated machine developments and the special high pile-up fills.