Machine Optics Studies for the LHC Measurements
M. Trzebinski
TL;DR
This paper analyzes the properties of scattered protons near the ATLAS Interaction Point under different LHC optics settings, focusing on detector acceptance and the influence of collimators.
Contribution
It provides a detailed study of beam properties, detector systems, and the effects of LHC optics and collimators on proton detection at ATLAS.
Findings
Beam divergence and width at IP and detector locations quantified.
Geometric acceptance of forward detectors evaluated.
Impact of collimators on detector acceptance discussed.
Abstract
In this work the properties of scattered protons in the vicinity of the ATLAS Interaction Point (IP1) for various LHC optics settings are discussed. Firstly, the beam elements installed around IP1 are presented. Then the ATLAS forward detector systems: Absolute Luminosity For ATLAS (ALFA) and ATLAS Forward Protons (AFP) are described and their similarities and differences are discussed. Next, the various optics used at Large Hadron Collider (LHC) are described and the beam divergence and width at the Interaction Point as well as at the ATLAS forward detectors locations are calculated. Finally, the geometric acceptance of the ATLAS forward detectors is shown and the impact of the LHC collimators on it is discussed.
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