WEPM013

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URL	https://doi.org/10.18429/JACoW-IPAC25-WEPM013
Title	Impact of the inner triplet polarity on the optics commissioning of the LHC in 2024 and 2025
Authors	J. Dilly, A. Calia, D. Mirarchi, D. Jacquet, E. Fol, E. Maclean, F. Soubelet, G. Trad, J. Keintzel, J. Wenninger, J. Gray, K. Paraschou, K. Skoufaris, M. Le Garrec, M. Stefanelli, M. Hostettler, R. De Maria, R. Tomas, S. Horney, S. Fartoukh, T. Persson, U. Kar, W. Van Goethem European Organization for Nuclear Research E. Kravishvili Université Paris-Saclay, European Organization for Nuclear Research F. Carlier École Polytechnique Fédérale de Lausanne J. Cardona Universidad Nacional de Colombia V. Ferrentino University of Naples Federico II, European Organization for Nuclear Research Y. Angelis Aristotle University of Thessaloniki, European Organization for Nuclear Research
Abstract	To mitigate the risk of radiation damage induced failure while operating the LHC beyond its initial integrated luminosity target, changes to the triplet polarity and crossing angles have been applied in the two main experimental interaction regions of the LHC. This allows for a more distributed radiation deposition in the insertion region magnets, which should allow their survival until they are replaced as part of the High Luminosity LHC upgrade from 2026-2030. These changes in the optics during 2024 and 2025 came with important challenges regarding machine commissioning and optics correction. In this paper, we discuss our experience of linear optics correction for the various triplet polarity configurations and review the implications for nonlinear optics corrections.
Paper	download: WEPM013.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	26 May 2025
Revised	02 June 2025
Accepted	02 June 2025
Issued	06 June 2025
DOI	10.18429/JACoW-IPAC25-WEPM013
Pages	1933-1936
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.