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Optics Measurement and Correction Strategies for HL-LHC / Buffat, Xavier (CERN) ; Carlier, Felix Simon (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; De Maria, Riccardo (CERN) ; Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Fol, Elena (CERN) ; Fuster Martinez, Nuria ; Gamba, Davide (CERN) ; Garcia Morales, Hector ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) et al.
The baseline strategy for optics commissioning in the HL-LHC era is presented and reviewed in detail, along with recent developments and unsolved matters in the linear and nonlinear optics measurement and correction techniques..
CERN-ACC-2022-0004. - 2022. - 104 p.
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LHC injection optics commissioning in 2021 and 2022 / Persson, Tobias Hakan Bjorn (CERN) ; Carlier, Felix Simon (CERN) ; Dilly, Joschua Werner (CERN) ; Fartoukh, Stephane (CERN) ; Fol, Elena (CERN) ; Garcia Morales, Hector ; Hofer, Michael (CERN) ; Keintzel, Jacqueline (CERN) ; Maclean, Ewen Hamish (CERN) ; Malina, Lukas et al.
LHC injection optics commissioning in 2021 and 2022
CERN-ACC-NOTE-2023-0015. - 2023.
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Optics Measurements and Correction Plans for the HL-LHC / Persson, Tobias (CERN) ; Buffat, Xavier (CERN) ; Carlier, Felix (CERN) ; Coello de Portugal, Jaime Maria (PSI, Villigen) ; De Maria, Riccardo (CERN) ; Dilly, Joschua (CERN) ; Fol, Elena (CERN) ; Gamba, Davide (CERN) ; Garcia Morales, Hector (CERN) ; García-Tabarés Valdivieso, Ana (CERN) et al.
The High Luminosity LHC (HL-LHC) will require stringent optics correction to operate safely and deliver the design luminosity to the experiments. In order to achieve this, several new methods for optics correction have been developed. [...]
2021 - 4 p. - Published in : 10.18429/JACoW-IPAC2021-WEPAB026 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, Br, 24 - 28 May 2021, pp.2656-2659
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(66)
Optics Correction Strategy for Run 3 of the LHC / Persson, Tobias (CERN) ; Cardona, Javier (Colombia, U. Natl.) ; De Maria, Riccardo (CERN) ; Dilly, Joschua (CERN) ; Fol, Elena (CERN) ; Garcia Morales, Hector (CERN) ; Hofer, Michael (CERN) ; Høydalsvik, Eirik (CERN) ; Keintzel, Jacqueline (CERN) ; Le Garrec, Mael (CERN) et al.
The Run 3 of the LHC will continue to provide new challenges for optics corrections. In order to succeed and go beyond what was achieved previously, several new methods to measure and correct the optics have been developed. [...]
JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) WEPAB027 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.WEPAB027
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Optics Measurement by Excitation of Betatron Oscillations in the CERN PSB / Maclean, Ewen H (CERN) ; Antoniou, Fanouria (CERN) ; Asvesta, Foteini (CERN) ; Bartosik, Hannes (CERN) ; Bracco, Chiara (CERN) ; Dilly, Joschua W (CERN) ; Fol, Elena (CERN) ; Garcia Morales, Hector (CERN) ; Hofer, Michael (CERN) ; Keintzel, Jacqueline (CERN) et al.
Optics measurement from analysis of turn-by-turn BPM data of betatron oscillations excited with a kicker magnet has been employed very successfully in many machines but faces particular challenges in the CERN PSB where BPM to BPM phase advances are sub-optimal for optics reconstruction. Experience using turn-by-turn oscillation data for linear optics measurements during PSB commissioning in2021 is presented, with implications for the prospect of such techniques in the PSB more generally..
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC '21 (2021) 4078-4081 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4078-4081
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(54)
Optics Correction Strategy for Run 3 of the LHC / Persson, Tobias (CERN) ; Cardona, Javier (Colombia, U. Natl.) ; Carlier, Felix (CERN) ; Costa Ojeda, Andressa (CERN) ; Dilly, Joschua (CERN) ; Ferrentino, Vittorio (CERN) ; Fol, Elena (CERN) ; García Morales, Hector (CERN) ; Hofer, Michael (CERN) ; Høydalsvik, Eirik (CERN) et al.
After more than 3 years of shutdown the LHC is again operational in 2022. Experience from the previous Long Shutdown (LS) has shown that the local errors in the triplet quadrupoles changed significantly between Run 1 and Run 2, and first measurements in 2022 unveil further changes. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1687-1690 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1687-1690
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Experimental Demonstration of Machine Learning Application in LHC Optics Commissioning / Fol, Elena (CERN) ; Cardona, Javier (Colombia, U. Natl.) ; Carlier, Felix (CERN) ; Dilly, Joschua (CERN) ; Hofer, Michael (CERN) ; Keintzel, Jacqueline (CERN) ; Le Garrec, Mael (CERN) ; Maclean, Ewen (CERN) ; Persson, Tobias (CERN) ; Soubelet, Felix (CERN) et al.
Recently, we conducted successful studies on the suitability of machine learning (ML) methods for optics measurements and corrections, incorporating novel ML-based methods for local optics corrections and reconstruction of optics functions. After performing extensive verifications on simulations and past measurement data, the newly developed techniques became operational in the LHC commissioning 2022. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 359-362 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.359-362
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(46)
Report from LHC MD 2158: IR-nonlinear studies / Maclean, Ewen Hamish (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Cruz Alaniz, Emilia ; Dalena, Barbara (Université Paris-Saclay (FR)) ; Dilly, Joschua Werner (Ministere des affaires etrangeres et europeennes (FR)) ; Fol, Elena (Johann-Wolfgang-Goethe Univ. (DE)) ; Giovannozzi, Massimo (CERN) ; Hofer, Michael (Vienna University of Technology (AT)) ; Malina, Lukas (University of Oslo (NO)) ; Persson, Tobias Hakan Bjorn (CERN) et al.
For the first time the LHC is running for luminosity-production with local corrections for nonlinear errors in the ATLAS and CMS insertions. [...]
CERN-ACC-NOTE-2018-0021. - 2018. - 22 p.
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MD6864 — Decapole studies at injection / Le Garrec, Mael (Goethe University Frankfurt (DE)) ; Carlier, Felix Simon (CERN) ; Dilly, Joschua Werner (CERN) ; Ferrentino, Vittorio (Universita di Napoli Federico II (IT)) ; Maclean, Ewen Hamish (CERN) ; Paraschou, Konstantinos (CERN) ; Tomas Garcia, Rogelio (CERN)
Chromaticity and amplitude detuning measurements were performed in the past at injection. [...]
CERN-ACC-NOTE-2023-0018. - 2023.
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Report from LHC MD 6863: Amplitude Detuning Corrections from Feed-Down / Dilly, Joschua Werner (CERN) ; Le Garrec, Mael (Goethe University Frankfurt (DE)) ; Maclean, Ewen Hamish (CERN) ; Van Riesen-Haupt, Leon (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Tomas Garcia, Rogelio (CERN)
Report of the MD6863 performed on the 24th and 25th of June 2022 to establish new corrections for the dodecapole correctors in LHC IP1 and IP5 to mitigate feed-down effects of high-order errors to amplitude detuning. [...]
CERN-ACC-NOTE-2023-0028. - 2023 - 13.
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