Beam Imaging and Luminosity Calibration

TL;DR

This paper presents a novel method for reconstructing proton bunch densities and calibrating luminosity in the LHC using vertex distributions from beam-beam scans, achieving sub-1% uncertainty in simulations.

Contribution

It introduces an innovative technique for two-dimensional beam shape reconstruction and an alternative luminosity calibration method based on vertex distributions.

Findings

Method successfully reconstructs beam shapes with high accuracy.

Luminosity calibration uncertainty estimated below 1%.

Validated on simulated beam-beam scans.

Abstract

We discuss a method to reconstruct two-dimensional proton bunch densities using vertex distributions accumulated during LHC beam-beam scans. The $x$-$y$ correlations in the beam shapes are studied and an alternative luminosity calibration technique is introduced. We demonstrate the method on simulated beam-beam scans and estimate the uncertainty on the luminosity calibration associated to the beam-shape reconstruction to be below 1\%.