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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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Interpretable Anomaly Detection in the LHC Main Dipole Circuits With Nonnegative Matrix Factorization
/ Obermair, Christoph (CERN ; Graz, Tech. U.) ; Apollonio, Andrea (CERN) ; Charifoulline, Zinour (CERN) ; Felsberger, Lukas (CERN) ; Janitschke, Marvin (CERN ; U. Rostock) ; Pernkopf, Franz (Graz, Tech. U.) ; Ravaioli, Emmanuele (CERN) ; Verweij, Arjan (CERN) ; Wollmann, Daniel (CERN) ; Wozniak, Mariusz (CERN)
CERN's Large Hadron Collider (LHC), with its eight superconducting main dipole circuits, has been in operation for over a decade. During this time, relevant operational parameters of the circuits, including circuit current, voltages across magnets and their coils, and current to ground, have been recorded. [...]
2024 - 12 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4004112
Fulltext: PDF;
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Reliability studies for CERN’s new safe machine parameter system
/ Blaszkiewicz, Milosz (CERN) ; Apollonio, Andrea (CERN) ; Bolton, Samuel (CERN) ; Colinet, Antoine (CERN) ; Romera, Iván (CERN) ; Secondo, Raffaello (CERN) ; Uythoven, Jan (CERN) ; Wollmann, Daniel (CERN) ; Felsberger, Lukas (CERN)
The Safe Machine Parameter system (SMP) is a critical part of the machine protection system in CERN’s Large Hadron Collider (LHC) and the Super Proton Synchrotron (SPS). It broadcasts safety-critical parameters like beam energy, beam intensity, the beta functions and flags indicating safety levels of the beam to other machine protection elements. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) THPA057
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPA057
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