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LHC Optics Measurements from Transverse Damper for the High Intensity Frontier
/ Nissinen, Tuuli (CERN) ; Carlier, Felix (CERN) ; Le Garrec, Mael (CERN) ; Maclean, Ewen (CERN) ; Persson, Tobias (CERN) ; Tomás García, Rogelio (CERN) ; Wegscheider, Andreas (CERN)
Current and future accelerator projects are pushing the brightness and intensity frontier, creating new challenges for turn-by-turn based optics measurements. Transverse oscillations are limited in amplitude due to particle losses. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 479-482
Fulltext: PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.479-482
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Optics for Landau Damping with Minimized Octupolar Resonances in the LHC
/ Wenninger, J (CERN) ; Solfaroli, M (CERN) ; Nissinen, T (CERN) ; Hostettler, M (CERN) ; Horney, S (CERN) ; Chudoba, F (CERN) ; Tomás García, Rogelio (CERN) ; Carlier, Felix (CERN) ; Deniau, Laurent (CERN) ; Dilly, Joschua (CERN) et al.
Operation of the Large Hadron Collider (LHC) requires strong octupolar magnetic fields to suppress coherent beam instabilities. The amplitude detuning that is generated by these octupolar magnetic fields brings the tune of individual particles close to harmful resonances, which are mostly driven by the octupolar fields themselves. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 503-506
Fulltext: PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.503-506
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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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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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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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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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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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Linear and Nonlinear Optics Measurements With Multiturn Data at PETRA III
/ Agapov, Ilya (DESY) ; Bieler, Michael (DESY) ; Ehrlichmann, Heiko (DESY) ; Keil, Joachim (DESY) ; Klute, Jens (DESY) ; Kube, Gero (DESY) ; Sahoo, Gajendra (DESY) ; Schmidt-Föhre, Frank (DESY) ; Tomás, Rogelio (CERN) ; Wanzenberg, Rainer (DESY) et al.
At Petra III measuring multiturn beam response to pulsed and continuous excitations allows linear and nonlinear (e.g. frequency maps) optics parameter determination. [...]
CERN-ACC-2017-258.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-MOPAB040
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPAB040
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Transverse Coupling Measurements With High Intensity Beams Using Driven Oscillations
/ Persson, Tobias (CERN) ; Baud, Guillaume (CERN) ; Buffat, Xavier (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Fol, Elena (CERN) ; Fuchsberger, Kajetan (CERN) ; Gabriel, Mathieu (CERN) ; Gąsior, Marek (CERN) ; Giovannozzi, Massimo (CERN) ; Hemelsoet, Georges-Henry (CERN) et al.
Transverse coupling has been linked to instabilities and reduction in dynamic aperture and is hence a crucial parameter to control in the LHC. In this article we describe the development to use driven oscillations to measure the transverse coupling with high intensity beams. [...]
CERN-ACC-2018-079.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-MOPMF047
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF047
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