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Chapter 28: Non-linear Optics Measurements and Corrections
/ Maclean, E H (CERN) ; Carlier, F (CERN) ; Dilly, J W (CERN) ; Giovannozzi, M (CERN) ; Karastathis, N ; Persson, T H B (CERN) ; Tomás, R (CERN)
Nonlinear optics errors in low-β* insertions pose a serious challenge to successful operation of the HL-LHC. LHC experience however has demonstrated that the previously assumed correction strategy, based upon ideal compensation of selected nonlinear resonances, as determined from magnetic measurements, suffers from several limitations. [...]
2024 - 14 p.
- Published in : Adv. Ser. Direct. High Energy Phys. 31 (2024) 579-592
Fulltext: PDF;
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The status of the energy calibration, polarization and monochromatization of the FCC-ee
/ Bauche, Jeremie (CERN) ; Blondel, Alain (CERN) ; Ciarma, Andrea (Frascati) ; Faus-Golfe, Angeles (IJCLab, Orsay) ; Bogomyagkov, Anton (Novosibirsk, IYF) ; Martens, Aurélien (IJCLab, Orsay) ; Gaskell, David (Jefferson Lab) ; Sagan, David (Cornell U.) ; Barber, Desmond (New Mexico U.) ; Shatilov, Dmitry (CERN) et al.
The Future Circular electron-positron Collider, FCC- ee, is designed for unprecedented precision for particle physics experiments from the Z-pole up to above the top-pair-threshold, corresponding to a beam energy range from 45.6 to 182.5 GeV. Performing collisions at various particle-physics resonances requires precise knowledge of the centre-of-mass energy (ECM) and collision boosts at all four interaction points. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL059
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL059
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60° phase advance optics measurements in the Large Hadron Collider at CERN
/ Keintzel, J (CERN) ; Fartoukh, S (CERN) ; Le Garrec, M (CERN) ; Persson, T H B (CERN) ; Solfaroli, M (CERN) ; Todesco, E (CERN) ; Tomás, R (CERN) ; Wenninger, J (CERN)
The Large Hadron Collider (LHC) arcs have been designed for a FODO optics with roughly 90° betatron phase advance per arc cell, but not necessarily with exactly the same optics in the eight sectors of the ring. Measuring an optics with a significantly different arc cell phase advance, e.g. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL026
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL026
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LHC Run 3 optics corrections
/ Carlier, F (CERN) ; Ojeda, A Costa (CERN) ; De Maria, R (CERN) ; Dilly, J (CERN) ; Ferrentino, V (CERN) ; Fol, E (CERN) ; Hofer, M (CERN) ; Keintzel, J (CERN) ; Le Garrec, M (CERN) ; Maclean, E H (CERN) et al.
The first year of Run 3 of the Large Hadron Collider (LHC) revealed significant changes in both linear and nonlinear optics errors with respect to Run 2. Several iterations of optics corrections were required to successfully bring the linear optics within operational tolerances. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL015
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL015
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Challenges of K-modulation measurements in the LHC Run 3
/ Carlier, F (CERN) ; Ojeda, A Costa (CERN) ; Dilly, J (CERN) ; Ferrentino, V (CERN) ; Fol, E (CERN) ; Hofer, M (CERN) ; Keintzel, J (CERN) ; Le Garrec, M (CERN) ; Levens, T (CERN) ; Maclean, E H (CERN) et al.
The future upgrade to the High-Luminosity Large Hadron Collider (HL-LHC) will impose tight tolerances on IP optics measurements. k-modulation is currently the preferred method in the LHC for IP optics measurements and will play a critical role in the HL-LHC. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL014
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL014
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First measurement of fourth and fifth order chromaticity in the LHC
/ Le Garrec, M (Goethe U., Frankfurt (main) ; CERN) ; Carlier, F S (CERN) ; Dilly, J (CERN) ; Maclean, E H (CERN) ; Persson, T H B (CERN) ; Tomás, R (CERN) ; Wegscheider, A (CERN)
Chromaticity up to the third order in the LHC has been well observed in the LHC’s first and second operational runs, with regular beam-based measurements performed during commissioning and machine development. In previous runs however, no higher-order chromaticity could be observed. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL027
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL027
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Operational Scenario of First High Luminosity LHC Run
/ Tomás García, Rogelio (CERN) ; Arduini, Gianluigi (CERN) ; Baudrenghien, Philippe (CERN) ; Bruce, Roderik (CERN) ; Brüning, Oliver (CERN) ; Buffat, Xavier (CERN) ; Calaga, Rama (CERN) ; Cerutti, Francesco (CERN) ; De Maria, Riccardo (CERN) ; Dilly, Joschua (CERN) et al.
A new scenario for the first operational run of the HL-LHC era (Run 4) has been recently developed to accommodate a period of performance ramp-up to achieve an annual integrated luminosity close to the nominal HL-LHC design. The operational scenario in terms of beam parameters and machine settings, as well as the different phases, are described here along with the impact of potential delays on key hardware components..
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 1846-1849
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1846-1849
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New LHC optics correction approaches in 2017
/ Maclean, E H (CERN) ; Tomás, R (CERN) ; Carlier, F S (CERN) ; Camillocci, J (CERN) ; Coello De Portugal, E (CERN) ; Fol, K (CERN) ; Fuchsberger, A (CERN) ; Valdivieso, Garcia-Tabares (CERN) ; Giovannozzi, M (CERN) ; Hofer, M (CERN) et al.
The optics commissioning strategy for low-$\beta ^{*}$ operation of the LHC underwent
significant revision in 2017 [1]. The beam-based correction strategy
transitioned from being concerned exclusively with linear optics errors, to a
combined linear and nonlinear optics commissioning, with the traditional optics
corrections at flat-orbit being both preceded and followed by corrections for
the effect of nonlinear errors in the ATLAS and CMS insertions..
2019 - 7 p.
- Published in : (2019) , pp. 77-83
Fulltext: PDF;
In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.77-83
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