Beam-induced backgrounds measured in the ATLAS detector during local gas injection into the LHC beam vacuum


Aad, G ORCID: 0000-0002-6665-4934, Aakvaag, E ORCID: 0000-0001-7616-1554, Abbott, B ORCID: 0000-0002-5888-2734, Abdelhameed, S ORCID: 0000-0002-0287-5869, Abeling, K ORCID: 0000-0002-1002-1652, Abicht, NJ ORCID: 0000-0001-5763-2760, Abidi, SH ORCID: 0000-0002-8496-9294, Aboelela, M ORCID: 0009-0003-6578-220X, Aboulhorma, A ORCID: 0000-0002-9987-2292, Abramowicz, H ORCID: 0000-0001-5329-6640 et al (show 2910 more authors) (2024) Beam-induced backgrounds measured in the ATLAS detector during local gas injection into the LHC beam vacuum. Journal of Instrumentation, 19 (06). P06014-P06014. ISSN 1748-0221, 1748-0221

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Abstract

<jats:title>Abstract</jats:title> <jats:p>Inelastic beam-gas collisions at the Large Hadron Collider (LHC), within a few hundred metres of the ATLAS experiment, are known to give the dominant contribution to beam backgrounds. These are monitored by ATLAS with a dedicated Beam Conditions Monitor (BCM) and with the rate of fake jets in the calorimeters. These two methods are complementary since the BCM probes backgrounds just around the beam pipe while fake jets are observed at radii of up to several metres. In order to quantify the correlation between the residual gas density in the LHC beam vacuum and the experimental backgrounds recorded by ATLAS, several dedicated tests were performed during LHC Run 2. Local pressure bumps, with a gas density several orders of magnitude higher than during normal operation, were introduced at different locations. The changes of beam-related backgrounds, seen in ATLAS, are correlated with the local pressure variation. In addition the rates of beam-gas events are estimated from the pressure measurements and pressure bump profiles obtained from calculations. Using these rates, the efficiency of the ATLAS beam background monitors to detect beam-gas events is derived as a function of distance from the interaction point. These efficiencies and characteristic distributions of fake jets from the beam backgrounds are found to be in good agreement with results of beam-gas simulations performed with the <jats:sc>Fluka</jats:sc> Monte Carlo programme.</jats:p>

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 02 Jul 2024 15:26
Last Modified: 08 Dec 2024 00:36
DOI: 10.1088/1748-0221/19/06/p06014
Open Access URL: https://iopscience.iop.org/article/10.1088/1748-02...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3182590
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