FRYD2

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URL	https://doi.org/10.18429/JACoW-IPAC25-FRYD2
Title	Review of linear and nonlinear optics measurements in the CERN LHC
Authors	E. Maclean, A. Wegscheider, E. Fol, F. Burkhardt, F. Soubelet, J. Keintzel, J. Coello de Portugal, J. Dilly, J. Gray, K. Paraschou, K. Skoufaris, L. Riesen-Haupt, M. Giovannozzi, M. Stefanelli, M. Hofer, P. Zisopoulos, R. Calaga, R. Tomas, S. Horney, T. Persson, T. Nissinen, U. Kar, W. Van Goethem European Organization for Nuclear Research A. García-Tabarés Valdivieso European X-Ray Free-Electron Laser C. Nellist University of Amsterdam, National Institute for Subatomic Physics, University of Amsterdam; National Institute for Subatomic Physics E. Kravishvili Université Paris-Saclay E. Waagaard, F. Carlier École Polytechnique Fédérale de Lausanne J. Cardona Universidad Nacional de Colombia L. Malina Deutsches Elektronen-Synchrotron DESY M. Le Garrec Institut National de Physique Nucléaire et de Physique des Particules M. McAteer Helmholtz-Zentrum Berlin für Materialien und Energie R. Miyamoto European Spallation Source S. White European Synchrotron Radiation Facility V. De Souza Brazilian Synchrotron Light Laboratory V. Ferrentino University of Naples Federico II Y. Angelis Aristotle University of Thessaloniki
Abstract	The LHC is approaching the end of its third operational run, with machine protection and performance having demanded an excellent control of the single-particle dynamics. Additionally, the requirement to rapidly commission multiple diverse sets of optics configurations within each year, and from year-to-year, placed clear demands on the measurement and correction methods employed. Tight tolerances on the linear optics have been consistently achieved, with the drive to ever-more pushed optics for the High Luminosity LHC era continuing to introduce new challenges. Routine control of linear coupling has been an operational necessity, while significant progress has also been made extending the understanding and control of the optics into the nonlinear regime. This paper presents the key methods used, the results obtained, and discusses the challenges to control of the beam-optics in the LHC.
Paper	download: FRYD2.pdf
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Conference	16th International Particle Accelerator Conference
Series
Location	Taipei, Taiwan
Date	01-06 Jun 2025
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	* Ming-Chyuan Lin - National Synchrotron Radiation Research Center * Yoichi Sato - KEK * Jui-Che Huang - National Synchrotron Radiation Research Center * David Button - Australian Nuclear Science and Technology Organisation * Ping-Shun Chuang - National Synchrotron Radiation Research Center
Online ISBN	978-3-95450-248-6
Online ISSN	2673-5490
Received	28 May 2025
Revised	06 June 2025
Accepted	06 June 2025
Issued	06 June 2025
DOI	10.18429/JACoW-IPAC25-FRYD2
Pages	3192-3197
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.