Observations from LHC proton-proton operation

TL;DR

This paper reports on two key effects observed during LHC 2012 proton-proton operations: end-of-squeeze instabilities affecting beam parameters and a reproducible loss pattern in Beam 1, with implications for luminosity.

Contribution

It provides detailed observations and statistical analysis of beam instabilities and loss patterns during LHC 2012 operations, enhancing understanding of beam dynamics.

Findings

End-of-squeeze instabilities impact beam parameters.

Reproducible loss pattern observed in Beam 1.

Impact on luminosity production highlighted.

Abstract

This paper describes two distinct effects observed during the operation of the LHC in 2012: first, the impacts on beam parameter evolution of the end-of-squeeze instabilities encountered in the second half of the 2012 run; and, second, the very reproducible loss pattern of Beam 1 observed (while a similar pattern was negligible, if present at all, for Beam 2). Statistics for 2012 are provided and the impact on luminosity production is highlighted.