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Prospect of operating with limited skew quadrupole corrector availability in the LHC interaction regions
/ Soubelet, F (CERN ; Liverpool U.) ; Persson, T (CERN) ; Kostoglou, S (CERN) ; Tomás, R (CERN) ; Hostettler, M (CERN) ; Welsch, C P (Liverpool U.)
In the Large Hadron Collider (LHC), corrections of local Interaction Region (IR) linear coupling are of importance to control beam sizes at Interaction Points (IPs) and hence the luminosity performance, as well as to prevent a significant impact on the beam dynamics. During the LHC Run 3, the skew quadrupole corrector magnets used on either side of IPs are expected to exceed their radiation dose limit. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL044
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL044
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2.
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Supervised Machine Learning for Local Coupling Sources Detection in the LHC
/ Soubelet, Felix (CERN ; U. Liverpool (main)) ; Apsimon, Oznur (U. Liverpool (main)) ; Persson, Tobias (CERN) ; Tomás García, Rogelio (CERN) ; Welsch, Carsten (U. Liverpool (main))
Local interaction region (IR) linear coupling in the LHC has been shown to have a negative impact on beam size and luminosity, making its accurate correction for Run 3 and beyond a necessity. In view of determining corrections, supervised machine learning has been applied to the detection of linear coupling sources, showing promising results in simulations. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 1842-1845
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1842-1845
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3.
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Prospect for Interaction Region Local Coupling Correction in the LHC Run 3
/ Soubelet, Felix (CERN ; Liverpool U.) ; Apsimon, Oznur (Liverpool U.) ; Persson, Tobias (CERN) ; Tomás García, Rogelio (CERN) ; Welsch, Carsten (Liverpool U.)
Successful operation of large scale particle accelerators depends on the precise correction of unavoidable magnet field or alignment errors present in the machine. In the LHC Run 2, local linear coupling in the Interaction Regions (IR) has been proven to have a severe impact on beam size and hence the luminosity - up to a 50% decrease -, making its handling a target for Run 3 and High Luminosity LHC (HL-LHC). [...]
JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) MOPAB007
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.MOPAB007
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4.
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First Interaction Region Local Coupling Corrections in the LHC Run 3
/ Soubelet, Felix (CERN ; Liverpool U.) ; Apsimon, Oznur (Liverpool U.) ; Persson, Tobias (CERN) ; Tomás García, Rogelio (CERN) ; Welsch, Carsten (Liverpool U.)
The successful operation of large scale particle accelerators depends on the precise correction of unavoidable magnetic field or magnet alignment errors present in the machine. During the LHC Run 2, local linear coupling in the interaction regions (IR) was shown to have a significant impact on the beam size, making its proper handling a necessity for Run 3 and the High Luminosity LHC (HL-LHC). [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 1838-1841
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1838-1841
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5.
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Optics for Landau damping with minimized octupolar resonances in the LHC
/ Tomás, R (CERN) ; Carlier, F (CERN) ; Chudoba, F (CERN) ; Deniau, L (CERN) ; Dilly, J (CERN) ; Ferrentino, V (CERN ; Naples U.) ; Horney, S (CERN) ; Hostettler, M (CERN) ; Keintzel, J (CERN) ; Kostoglou, S (CERN) et al.
Operation of the Large Hadron Collider (LHC) requires strongoctupolar magnetic fields to suppress coherent beam instabilities.The amplitude detuning that is generated by these octupolar magneticfields brings the tune of individual particles close to harmfulresonances, which are mostly driven by the octupolar fieldsthemselves. In 2023, new optics were deployed in the LHC atinjection with optimized betatronic phase advances to minimize theresonances from the octupolar fields without affecting the amplitudedetuning. [...]
2024 - 14 p.
- Published in : JINST 19 (2024) T05010
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.T05010
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6.
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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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7.
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Machine Configuration for the 2023 Proton Run (MD7003)
/ Fartoukh, Stephane (CERN) ; Dilly, Joschua Werner (CERN) ; Hostettler, Michi (CERN) ; Iadarola, Giovanni (CERN) ; Jacquet, Delphine (CERN) ; Kostoglou, Sofia (CERN) ; Mirarchi, Daniele (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Sterbini, Guido (CERN) et al.
This note contains a condensed summary of the various beam tests which took place in 2022 in order to validate the machine configuration planned to be deployed for the 2023 proton run of the LHC, including in particular a combined ramp and anti-telescopic squeeze, the rotation of the external crossing angle in LHCb, and beam operation with up to 1.8 × 1011 p/b..
CERN-ACC-NOTE-2023-0005.
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2023.
Full text
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9.
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SPS Studies in Preparation for the Crab Cavity Experiment
/ Alekou, Androula (CERN ; U. Manchester (main) ; CERN) ; Antoniou, Fanouria (CERN ; CERN) ; Appleby, Robert (U. Manchester (main) ; U. Manchester (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Arduini, Gianluigi (CERN ; CERN) ; Bartosik, Hannes (CERN ; CERN) ; Calaga, Rama (CERN ; CERN) ; Papaphilippou, Yannis (CERN ; CERN ; CERN) ; Welsch, Carsten (U. Liverpool (main) ; Cockcroft Inst. Accel. Sci. Tech.)
A local Crab Cavity (CC) scheme will recover head-on collisions at the Interaction Points (IPs) of the High Luminosity LHC (HL-LHC), which aims to increase the LHC luminosity by a factor of 3-10. The first time that CC will ever be tested with proton beams will be in 2018 in the SPS machine. [...]
CERN-ACC-2017-203.-
2017 - 3 p.
- Published in : 10.18429/JACoW-IPAC2017-TUPVA034
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA034
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Simulations and experiments for dynamic aperture studies in the LHC ion operation
/ Kostoglou, Sofia (CERN) ; Sterbini, Guido (CERN) ; Bartosik, Hannes (CERN) ; Efthymiopoulos, Ilias (CERN) ; Hostettler, Michi (CERN) ; Bruce, Roderik (CERN)
Dynamic Aperture (DA) studies, based on single-particle tracking simulations including important non-linear fields such as beam-beam effects, have played a crucial role in guiding the operation of the Large Hadron Collider (LHC) in proton-proton collisions. The correspondence between DA computed through simulations and the actual beam lifetime during operation has been established for proton beams through dedicated experiments at the LHC. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) MOPS06
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPS06
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