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Long-range beam-beam mitigation for round optics
/ Fartoukh, Stephane (CERN) ; Kostoglou, Sofia (CERN)
When colliding high intensity bunch trains at low beta*, a sufficiently large crossing angle needs to be imposed at the interaction point (IP) in order to separate the two beams before and after the collision, and mitigate the so-called long-range beam-beam (BBLR) effect, which otherwise can be very detrimental to the beam lifetime. [...]
CERN-ACC-2023-0005.
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2023 - 22.
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LHC optics commissioning in 2023 and 2024
/ Persson, Tobias (CERN) ; Wegscheider, Andreas (CERN) ; Fol, Elena (CERN) ; Maclean, Ewen (CERN) ; Carlier, Felix (CERN) ; Soubelet, Felix (CERN) ; Trad, Georges (CERN) ; Keintzel, Jacqueline (CERN) ; Cardona, Javier (Columbia U.) ; Dilly, Joschua (CERN) et al.
The LHC machine configuration was changed in 2023 compared to previous years, requiring a new set of optics configurations to be measured and corrected. A telescopic optics was deployed in energy the ramp for the first time, which gave rise to a beta-beating of up to 25% [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) MOPC12
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPC12
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Operation of the LHC during the 2023 proton run
/ Calia, Andrea (CERN) ; Salvant, Benoit (CERN) ; Mirarchi, Daniele (CERN) ; Nisbet, David (CERN) ; Jacquet, Delphine (CERN) ; Métral, Elias (CERN) ; Bravin, Enrico (CERN) ; Trad, Georges (CERN) ; Wenninger, Jorg (CERN) ; Solfaroli, Matteo (CERN) et al.
In 2023 the LHC restarted after the yearly winter shutdown with a new machine configuration optimized for intensities of up to 1.8e+11 protons per bunch. In the first two months of the 2023 run the bunch intensities were pushed up to 1.6e+11 protons per bunch until a severe vacuum degradation, caused by a damaged RF bridge, occurred close to the ATLAS experiment. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) MOPC17
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPC17
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Evolution of special LHC optics configurations Run 3 update
/ Efthymiopoulos, Ilias (CERN) ; Wegscheider, Andreas (CERN) ; Mirarchi, Daniele (CERN) ; Maclean, Ewen (CERN) ; Carlier, Felix (CERN) ; Van der Veken, Frederik (CERN) ; Dilly, Joschua (CERN) ; Le Garrec, Mael (CERN) ; D'Andrea, Marco (CERN ; INFN, Legnaro) ; Solfaroli, Matteo (CERN) et al.
The Large Hadron Collider (LHC) employs special optics and configurations, alongside low-beta* collision optics, to address specific experimental requirements. These include calibrating luminosity monitors (vdM) and facilitating forward physics measurements in TOTEM and ALFA experiments (high-beta). [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) MOPC16
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPC16
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LHC Triplet Task Force Report
/ Arduini, Gianluigi (CERN) ; Bradu, Benjamin (CERN) ; Brodzinski, Krzysztof (CERN) ; Bruce, Roderik (CERN) ; Cerutti, Francesco (CERN) ; Ciccotelli, Alessia (University of Manchester (GB)) ; Deferne, Guy (CERN) ; Fartoukh, Stephane (CERN) ; Fessia, Paolo (CERN) ; Garion, Cedric (CERN) et al.
The excellent performance of the Large Hadron Collider (LHC) and the extension of Run 3 by one year have led to a significant increase of the expected integrated luminosity by the end of its operation and before the start of the High Luminosity LHC (HL-LHC), exceeding the design LHC integrated luminosity of 300 fb−1 for which the final focus region has been designed. [...]
CERN-ACC-2023-0004.
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2023. - 95 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.
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2023.
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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.
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Bunch Luminosity Variations in LHC Run 2
/ Efthymiopoulos, Ilias (CERN) ; Fartoukh, Stephane D (CERN) ; Iadarola, Giovanni (CERN) ; Karastathis, Nikolaos (CERN) ; Papadopoulou, Stefania (CERN) ; Papaphilippou, Yannis (CERN)
The LHC is designed to collide intense bunches of protons with tightly defined conditions, aimed to maximize the delivered recorded integrated luminosity to the experiments. One of these conditions is the maximum level of bunch-to-bunch fluctuation in the luminosity, in particular when levelling at maximum acceptable event rate at the experiments. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 4094-4097
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4094-4097
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LHC Configuration and Operational Scenario for Run 3
/ Fartoukh, Stephane (CERN) ; Kostoglou, Sofia (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Arduini, Gianluigi (CERN) ; Bartosik, Hannes (CERN) ; Bracco, Chiara (CERN) ; Brodzinski, Krzysztof (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Calviani, Marco (CERN) et al.
After its second successful run period, the Large Hadron Collider (LHC) shut down for three years with the plan of being recommissioned in 2022 for a three-year physics production period, the Run 3. [...]
CERN-ACC-2021-0007.
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2021. - 33 p.
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