CERN Accelerating science

Article
Report number	arXiv:2107.09560
Title	Performance and luminosity models for heavy-ion operation at the CERN Large Hadron Collider
Author(s)	Bruce, R. (CERN) ; Jebramcik, M.A. (CERN ; DESY) ; Jowett, J.M. (CERN ; Darmstadt, GSI) ; Mertens, T. (Helmholtz-Zentrum, Berlin) ; Schaumann, M. (CERN)
Publication	2021-07-12
Imprint	2021-07-20
Number of pages	24
Note	29 pages, 11 figures
In:	Eur. Phys. J. Plus 136 (2021) 745
DOI	10.1140/epjp/s13360-021-01685-5 (publication)
Subject category	physics.acc-ph ; Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN LHC
Abstract	A good understanding of the luminosity performance in a collider, as well as reliable tools to analyse, predict, and optimise the performance, are of great importance for the successful planning and execution of future runs. In this article, we present two different models for the evolution of the beam parameters and the luminosity in heavy-ion colliders. The first, Collider Time Evolution (CTE) is a particle tracking code, while the second, the Multi-Bunch Simulation (MBS), is based on the numerical solution of ordinary differential equations for beam parameters. As a benchmark, we compare simulations and data for a large number of physics fills in the 2018 Pb-Pb run at the CERN Large Hadron Collider (LHC), finding excellent agreement for most parameters, both between the simulations and with the measured data. Both codes are then used independently to predict the performance in future heavy-ion operation, with both Pb-Pb and p-Pb collisions, at the LHC and its upgrade, the High-Luminosity LHC. The use of two independent codes based on different principles gives increased confidence in the results.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2021-2025 The Author(s) (License: CC-BY-4.0)

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