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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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2024-09-18
14:51
Impedance Studies on the LHC Interconnect Modules / Dissanayake, Maleesh
During the third run of the Large Hadron Collider in 2023, characterized by the highest intensity bunch population to date, a beam dump incident with operational delays occurred due to increased losses linked to pressure spikes within a warm vacuum sector [...]
CERN-THESIS-2024-157 - 120 p.


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2024-08-30
17:25
Detector Overview - ATLAS Fact Sheet [Dutch] / Rodriguez Vera, Ana Maria (Northern Illinois University (US)) ; Van Wijk, Dave (CERN)
ATLAS-OUTREACH-2024-017. - 2024. - 1.
Language: Dutch

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2024-08-21
09:15
Bridging Monte Carlo Worlds: A New Framework for Accelerator Physics Simulations Applied on Shielding and Machine Protection Studies / Donadon Servelle, Andre
This thesis delves into the critical study of particle transport in matter, particularly emphasising its implications for machine protection at CERN’s accelerator complex and facilities [...]
CERN-THESIS-2024-121 - 207 p.


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2024-08-20
13:31
Performance of beam collimation for high energy colliders / Potoine, Jean-Baptiste
The LHC heavy-ion program with 208Pb82+ beams will benefit from a significant increase of the beam intensity when entering its High-Luminosity era in Run 3 [...]
CERN-THESIS-2023-403 - 210 p.


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2024-08-19
22:41
Numerical simulations of the thermal behavior of Beam Wire Scanners and energy deposition of high energy protons in carbon nanotube microbraids / Abouelenain, Abdelrahman
Various types of beam diagnostics are used in particle accelerators to monitor and control beam parameters such as intensity, energy, time structure, and shape [...]
CERN-THESIS-2024-120 - 52 p.


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