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Availability and luminosity in the Future Circular Electron-Positron Collider (FCC-ee)
/ Heron, Jack (CERN) ; Blaszkiewicz, Milosz (CERN) ; Felsberger, Lukas (CERN) ; Uythoven, Jan (CERN) ; Wollmann, Daniel (CERN)
The Future Circular Electron-Positron Collider (FCC-ee) is CERN's leading proposal for the next generation of energy-frontier particle accelerators. To reach integrated luminosity goals, it aims to be operational for minimum 80 % of the scheduled 185 physics days each year. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) WEBN3
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEBN3
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Study of the performance and beam loss limitations during injection of high-intensity LHC proton beams
/ Salvachua, Belen (CERN) ; Lechner, Anton (CERN) ; Bracco, Chiara (CERN) ; Zamantzas, Christos (CERN) ; Wollmann, Daniel (CERN) ; Mirarchi, Daniele (CERN) ; Effinger, Ewald (CERN) ; Velotti, Francesco (CERN) ; Trad, Georges (CERN) ; Wenninger, Jorg (CERN) et al.
The LHC Injectors Upgrade project at CERN optimized the injection accelerator chain to deliver proton intensities per bunch of 2.3e+11 ppb. Throughout 2023, the LHC was filled with up to 2464 bunches per beam using a hybrid injection scheme, involving up to 236 bunches per injection, with a maximum intensity per bunch of 1.6e+11 ppb. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) THPR31
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.THPR31
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Simulated impact of the HL-LHC beam on a graphite target
/ Hjelle, Ingrid (CERN) ; Lechner, Anton (CERN ; Rome U.) ; Piccini, Audrey (CERN) ; Wiesner, Christoph (CERN) ; Wollmann, Daniel (CERN) ; Carra, Federico (CERN) ; Heron, John (CERN) ; Pasquali, Michele (CERN)
In the High Luminosity Large Hadron Collider (HL-LHC) era, the intensity of the circulating bunches will increase to 2.2e+11 protons per bunch, almost twice the nominal LHC value. Besides detailed studies of known and new failure cases for HL-LHC, it is also required to investigate failures beyond nominal design. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) MOPC18
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPC18
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A public data service for the Beam Interlock Systems at CERN - current status and future plans
/ Garnier, Jean-Christophe (CERN) ; Barth, Jonas (CERN) ; Galilée, Marc-Antoine (CERN) ; Wollmann, Daniel (CERN) ; Buszydlik, Aleksander (CERN) ; Skarhed, Tobias (CERN)
The Beam Interlock System (BIS) is the backbone of the machine protection system in CERN’s accelerator chain, ensuring that the beams are safely transported through the injector chain and circulated in the Large Hadron Collider. A new version of the BIS is currently under development and planned to be deployed in the SPS, LHC and the North Area experimental zone during the Long Shutdown 3 (LS3), while the recently installed BIS in LINAC4 and the PSB will remain in place. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) THPA121
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPA121
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Machine protection perspective on the restart of the large hadron collider after long shutdown 2
/ Wiesner, Christoph (CERN) ; Hernalsteens, Cédric (CERN) ; Solfaroli, Matteo (CERN) ; Wenninger, Jorg (CERN) ; Wollmann, Daniel (CERN) ; Uythoven, Jan (CERN)
In 2022, the Large Hadron Collider started its third operational run. Following the three-year Long Shutdown 2, a careful re-commissioning of the machine protection system (MPS) took place. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL039
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL039
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Photoelectric charging and lofting of dust particles on a conducting surface with external electric fields
/ Taylor, Kelyan (U. Colorado, Boulder) ; Elliott, Amanda (Rochester U.) ; Wang, Xu (U. Colorado, Boulder) ; Horanyi, Mihaly (U. Colorado, Boulder) ; Schmidt, Rudiger (Darmstadt, Tech. U.) ; Wollmann, Daniel (CERN) ; Wiesner, Christoph (CERN) ; Belanger, Philippe (TRIUMF)
We present a laboratory study of photoelectric charging of dust particles and their lofting on a conducting surface in the presence of external electric fields. Insulating particles with diameter <45 μm are dispersed on a conducting surface exposed to ultraviolet (UV) light. [...]
2024 - 6 p.
- Published in : Phys. Plasmas 31 (2024) 073703
Fulltext: PDF;
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Chapter 12: Machine Protection in the High Luminosity LHC
/ Apollonio, A ; Bélanger, P (CERN) ; Carrillo, D (CERN) ; Denz, R (CERN) ; Mateos, F Rodriguez (CERN) ; Panev, B (CERN) ; Siemko, A (CERN) ; Uythoven, J (CERN) ; Verweij, A (CERN) ; Wollmann, D (CERN) et al.
In the high luminosity era of the LHC, the energy stored in the two beams will nearly double as compared with the design value of the current LHC and the beta functions will significantly increase in critical locations. In addition, novel equipment like Nb3Sn based superconducting magnets, crab cavities, hollow e-lenses and others will be installed. [...]
2024 - 19 p.
- Published in : Adv. Ser. Direct. High Energy Phys. 31 (2024) 297-315
Fulltext: PDF;
In : The High Luminosity Large Hadron Collider, pp.297-315
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LHC Upgrades in preparation of Run 3
/ Arduini, G (CERN) ; Baglin, V (CERN) ; Bartosik, H (CERN) ; Bottura, L (CERN) ; Bracco, C (CERN) ; Bradu, B (CERN) ; Bregliozzi, G (CERN) ; Brodzinski, K (CERN) ; Bruce, R (CERN) ; Calviani, M (CERN) et al.
The Large Hadron Collider (LHC) Long Shutdown 2(2019–2021), following LHC Run 2, was primarily dedicated to theupgrade of the LHC Injectors but it included also a significantamount of activities aimed at consolidation of the LHC machinecomponents, removal of known limitations and initial upgrades inview of the High-Luminosity LHC (HL-LHC) to favour the intensityramp-up during Run 3 (2022–2025). An overview of the majormodifications to the accelerator and its systems is followed by asummary of the results of the superconducting magnet trainingcampaign to increase the LHC operation energy beyond the maximumvalue of 6.5 TeV reached during Run 2. [...]
2024 - 138 p.
- Published in : JINST 19 (2024) P05061
Fulltext: PDF;
In : The Large Hadron Collider and The Experiments for Run 3, pp.P05061
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