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2024-10-04
09:27
Correlating start-of-ramp losses with beam observables at blat-bottom in the LHC / Karlsen-Bæck, Birk Emil (CERN ; Rome U.) ; Salvachua, Belen (CERN) ; Timko, Helga (CERN) ; Zampetakis, Michail (CERN) ; Morales Vigo, Sara (CERN)
Power limitations are expected at injection energy for the main Radio Frequency (RF) system due to the doubled bunch intensity in the High Luminosity (HL-) Large Hadron Collider (LHC) era. One way to overcome these power limitations is to reduce the capture voltage. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) MOPC11 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPC11

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2024-10-04
09:27
LHC 2023 ion optics commissioning / Ferrentino, Vittorio (Naples U. ; CERN) ; Wegscheider, Andreas (CERN) ; Gilardi, Antonio (CERN) ; Fol, Elena (CERN) ; Maclean, Ewen (CERN) ; Carlier, Felix (CERN) ; Soubelet, Felix (CERN) ; Keintzel, Jacqueline (CERN) ; Cardona, Javier (Colombia, U. Natl.) ; Dilly, Joschua (CERN) et al.
In 2023, about 2 months of LHC operation were devoted to Heavy Ion physics. In this paper, results of the 2023 ion optics commissioning are reported. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) MOPC20 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPC20

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2024-10-04
08:52
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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2024-10-04
08:52
Numerical methods for emittance computation from luminosity / Rufolo, Matteo (Dalle Molle Inst. AI Studies, Lugano) ; Fornara, Andrea (Manchester U. ; CERN) ; Lamb, Elleanor (Ecole Polytechnique, Lausanne ; CERN) ; Sterbini, Guido (CERN) ; Giacomel, Lorenzo (CERN)
The beam transverse emittances play a critical role in high-energy colliders. Various measurement techniques are employed to measure them. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) MOPC19 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPC19

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2024-10-04
08:52
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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2024-10-02
14:55
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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2024-10-02
14:54
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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2024-10-02
14:54
Impact of multiple beam-beam encounters on LHC absolute-luminosity calibrations by the van der Meer method / Wanczyk, Joanna (CERN ; Ecole Polytechnique, Lausanne) ; Dabrowski, Anne (CERN) ; Stickland, David (CERN) ; Pieloni, Tatiana (Ecole Polytechnique, Lausanne, LPAP) ; Kozanecki, Witold (IRFU, Saclay) ; Buffat, Xavier (CERN)
The LHC particle-physics program requires that the delivered luminosity be measured to an absolute accuracy in the 1% range. To this effect, the absolute luminosity scale at each interaction point (IP) is calibrated by scanning the beams across each other according to the van der Meer method. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPA053 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPA053

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2024-10-02
14:54
Sextupole RDTs in the LHC at injection and in the ramp / Horney, S J (CERN ; Oxford U.) ; Maclean, E (CERN) ; Burrows, P (Oxford U.) ; Carlier, F (CERN) ; Dilly, J (CERN) ; Deniau, L (CERN) ; Ferrentino, V (CERN) ; Fol, E (CERN) ; Hofer, M (CERN) ; Keintzel, J (CERN) et al.
During 2023, examination of the action dependence of sextupolar resonance driving terms (RDT) in the LHC at injection, as measured with an AC-dipole, demonstrated that a robust measurement of the RDTs could still be achieved even with very small amplitude kicks, typically used for linear optics studies. Consequently, analysis of optics measurements from 2022 and 2023 during the LHC energy ramp allowed a first measurement of the sextupole resonance evolution. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) MOPC13 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPC13

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2024-10-01
14:12
$CP-$violation in Partially Reconstructed $B^\pm \rightarrow \ D^*h^\pm$Decays at LHCb / Stanislaus, Seophine (University of Oxford (GB))
This thesis presents a measurement of $CP-$violation in partially reconstructed $B^\pm \rightarrow \ D^*K^\pm$ and ${B^\pm \to D^* \pi^\pm}$ decays, where the neutral pion and photon from the $D^* \to D\pi^0$ and ${D^* \to D \gamma}$ decays are not reconstructed. The $D$ meson is subsequently reconstructed in the ${D \to K^{^0_S} \pi^+ \pi^-}$ or $D\to K^{^0_S} K^+K^-$ final state. [...]
CERN-THESIS-2024-171.- Fulltext: PDF; External link: Approve this document (restricted)

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High Luminosity Large Hadron Collider (HL-LHC) (1,201)
HiLumi LHC (264)