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1.
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Understanding of the LHC warm vacuum module heating
/ Krkotic, Patrick (CERN) ; Baglin, Vincent (CERN) ; Chiggiato, Paolo (CERN) ; Papaphilippou, Yannis (CERN) ; Rumolo, Giovanni (CERN) ; Antuono, Chiara (CERN ; Rome U.) ; Bregliozzi, Giuseppe (CERN) ; Calatroni, Sergio (CERN) ; de la Fuente, Elena (CERN ; Madrid, Polytechnic U.) ; Galloro, Alessio (Calabria U. ; CERN) et al.
During the third run of the Large Hadron Collider in 2023, which had the highest intensity bunch population compared to previous runs, increased losses attributed to pressure spikes within a warm vacuum sector triggered a beam dump. Subsequent inspections revealed localised annealing and plasticisation of the tension spring in the sliding contact radio-frequency finger module, alongside traces of vapour deposition on the various module components with the stainless-steel spring material. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) TUAN3
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.TUAN3
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2.
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3.
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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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4.
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HL-LHC IT STRING: Status and Perspectives
/ Bajko, M (CERN) ; Baglin, V (CERN) ; Ballarino, A (CERN) ; Bednarek, M J (CERN) ; Bertolasi, S (CERN) ; Bertone, C (CERN) ; Blanchard, S (CERN) ; Bozzini, D (CERN) ; Coulot, E (CERN) ; Coupat, C (CERN) et al.
The HL-LHC IT STRING, an integrated test stand for the major components of the HL-LHC Inner Triplet (IT) zone, is in its construction phase in a surface building at CERN. The main motivation is to study and validate the collective behavior of the different systems: magnets, circuit protection, cryogenics for magnets and superconducting link, magnet powering, vacuum, alignment, and interconnections between magnets and superconducting link. [...]
2024 - 6 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 9001306
Fulltext: PDF;
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5.
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DYVACS (DYnamic VACuum Simulation) code: gas density profiles for dynamic conditions in particle accelerators - simulations for the LHC and the FCCee
/ Bilgen, Suheyla (IJCLab, Orsay) ; Mercier, Bruno (IJCLab, Orsay) ; Baglin, Vincent (CERN) ; Sattonnay, Gaël (IJCLab, Orsay)
The computation of residual gas density profiles in particle accelerators is an essential task to optimize beam pipes and vacuum system design. In a hadron collider such as the LHC, the beam induces dynamic effects due to ion, electron and photon-stimulated gas desorption. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) THPA161
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPA161
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6.
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Impedance analysis of deformable RF contact bridges for high luminosity LHC
/ Krkotic, P (CERN) ; Calatroni, S (CERN) ; Neroni, M (CERN) ; Völlinger, C (CERN) ; Salvant, B (CERN) ; Baglin, V (CERN) ; Garion, C (CERN) ; Bregliozzi, G (CERN)
In order to maintain the continuity of the vacuum system wall and comply with beam stability limits, radio frequency contact bridges are utilised as transitional elements in beam vacuum line interconnections. These radio frequency contact bridges must absorb and correct longitudinal, angular, and transverse misalignments brought on by mechanical motions during assembly, alignment, operating phases and thermal influences during accelerator operation. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) WEPL153
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPL153
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7.
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X-Ray induced desorption and photochemistry in CO ice
/ Dupuy, R (LERMA, Ivry) ; Bertin, M (LERMA, Ivry) ; Féraud, G (LERMA, Ivry) ; Romanzin, C (LCP, Orsay) ; Putaud, T (LERMA, Ivry) ; Philippe, L (LERMA, Ivry) ; Michaut, X (LERMA, Ivry) ; Jeseck, P (LERMA, Ivry) ; Cimino, R (Frascati) ; Baglin, V (CERN) et al.
We report an investigation of X-ray induced desorption of neutrals, cations and anions from CO ice. The desorption of neutral CO, by far the most abundant, is quantified and discussed within the context of its application to astrochemistry. [...]
2021 - 15 p.
- Published in : Phys. Chem. Chem. Phys. 23 (2021) 15965-15979
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8.
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Vacuum challenges at the beam energy frontier
/ Baglin, V (CERN) ; Chiggiato, P (CERN) ; Kersevan, R (CERN)
The following sections are included:Introduction, Beamscreen design, Electron-cloud, Impedance, Ion-stimulated desorption, Summary, References
2023 - 4 p.
- Published in : 10.1142/9789811280184_0029
Fulltext: PDF;
In : The future of the Large Hadron Collider, pp.423-426
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9.
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Photodesorption of Water Ices: Highlights from Recent Synchrotron Radiation Studies
/ Fillion, Jean-Hugues (Paris Observ.) ; Dupuy, Rémi (Paris Observ.) ; Féraud, Géraldine (Paris Observ.) ; Romanzin, Claire (ICM, Paris) ; Marie-Jeanne, Patrick (Paris Observ.) ; Jeseck, Pascal (Paris Observ.) ; Baglin, Vincent (CERN) ; Cimino, Roberto (LNF, Dafne Light) ; Michaut, Xavier (Paris Observ.) ; Bertin, Mathieu (Paris Observ.)
UV-X photodesorption of water ices, which is playing a role on the gas-to-ice ratio in a wide range of astrophysical environments, has also been extensively studied in the laboratory. In recent years, the SPICES setup coupled to several beamlines at the SOLEIL facility (France) has allowed the analysis of water photodesorption spectra (PSD) in the vacuum-UV (VUV) and soft X-ray range. [...]
2023 - 7 p.
- Published in : Astrophys. Space Sci. Proc. 59 (2023) 229-235
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10.
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Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions
/ Haubner, Michal (CERN ; Prague, Tech. U.) ; Krkotic, Patrick (CERN) ; Serafim, Catarina (CERN ; Helsinki U.) ; Petit, Valentine (CERN) ; Baglin, Vincent (CERN) ; Calatroni, Sergio (CERN) ; Henrist, Bernard (CERN) ; Romanov, Artur (Barcelona, Autonoma U.) ; Puig, Teresa (Barcelona, Autonoma U.) ; Gutierrez, Joffre (Barcelona, Autonoma U.)
Particle accelerators with superconducting magnets operating at cryogenic temperatures use a beam screen (BS) liner that extracts heat generated by the circulating bunched charge particle beam before it can reach the magnets. The BS surface, commonly made of high-conductivity copper, provides a low impedance for beam stability reasons, low secondary electron yield (SEY)to mitigate the electron-cloud (EC) effect, and low electron-stimulated desorption yield (ESD) to limit the dynamic pressure rise due to EC. [...]
arXiv:2410.00770.-
2023-02-21 - 15 p.
- Published in : Appl. Sciences 13 (2023) 2765
Fulltext: 2410.00770 - PDF; document - PDF;
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