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2025-04-01
09:28
LHC MD#13523 Measurement of LHC beam intensity dependent transverse tune shifts at injection energy / Wanczyk, Joanna ; Bartosik, Hannes (CERN) ; Buffat, Xavier (CERN) ; Giacomel, Lorenzo ; Hostettler, Michi (CERN) ; Mases Sole, Ingrid (Goethe University Frankfurt (DE)) ; Paraschou, Konstantinos ; Salvant, Benoit (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Trad, Georges (CERN)
Observations of betatron tune evolution during LHC beam injection have revealed a significant tune error, strongly correlated with beam intensity. [...]
CERN-ACC-NOTE-2025-0005. - 2025
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2025-04-01
06:05
LHCb RICH Fast-timing photon detection at the SPS charged particle beam / Bartolini, M (Cambridge U.) ; Bolzonella, R (Ferrara U. ; INFN, Ferrara) ; Borgato, F (Padua U.) ; Cardinale, R (Genoa U. ; INFN, Genoa) ; Cojocariu, L N (Bucharest, IFIN-HH) ; Cotta Ramusino, A (INFN, Ferrara) ; Duk, V (INFN, Perugia ; Perugia U.) ; Fantini, L (INFN, Perugia ; Perugia U.) ; Foulds-Holt, D (Cambridge U.) ; Keizer, F (CERN) et al.
Abstract The use of a new optoelectronic readout chain with  𝒪(100)ps time resolution is a major milestone in the development of RICH detectors for environments with a high number of particle interactions per bunch crossing, such as the High-Luminosity LHC. A prototype chain, based on MAPMT and SiPM photon sensors coupled to readout electronics integrating the FastIC ASIC and a TDC-in-FPGA, is presented. [...]
LHCb-DP-2025-003.- 2025 - 29 p. - Published in : JINST 20 (2025) P03034 Fulltext: PDF;

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2025-03-27
14:44
AI-Based Characterization of Anomalies during Beam Dumps at CERN’s Large Hadron Collider / Hermueller, Philipp
Beam losses at the Large Hadron Collider can lead to critical damages that would entail costly repairs and downtime [...]
CERN-THESIS-2025-023 - 2025 - 135.


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2025-03-27
09:27
Study of the radiation background and of new monitoring tools at the LHC for Run 3 and the HL-LHC / Prelipcean, Daniel
The hostile radiation environment at the Large Hadron Collider (LHC) affects detectors, accelerator beamline elements and electronic devices, requiring the careful characterisation of the radiation levels [...]
CERN-THESIS-2024-366 - 2025 - 255.


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2025-03-27
06:11
First CERN Cold Masses for the HL-LHC Interaction Regions / Prin, Herve (CERN) ; Axensalva, Jerome (CERN) ; Bampton, Tavis (CERN) ; Bourcey, Nicolas (CERN) ; Devred, Arnaud (CERN) ; Duarte Ramos, Delio Luis (CERN) ; Ferradas Troitino, Jose (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Milanese, Attilio (CERN) ; Pentella, Mariano (CERN) et al.
In the framework of the HL-LHC project, CERN has the responsibility to develop, qualify and assemble three different types of cold masses, namely Q2 (final focus quadrupole in the triplet), CP (corrector package) and D2 (separation dipole). In this paper, we describe the various designs, which incorporate several novel features. [...]
2024 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4004805

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2025-03-27
04:07
Measurement of the nonlinear diffusion of the proton beam halo at the CERN LHC / Montanari, C.E. (Manchester U. ; CERN ; Cockcroft Inst. Accel. Sci. Tech.) ; Appleby, R.B. (Manchester U.) ; Bazzani, A. (Bologna U. ; INFN, Bologna) ; Giovannozzi, M. (CERN) ; Hermes, P. (CERN) ; Poyet, A. (CERN) ; Redaelli, S. (CERN) ; Sterbini, G. (CERN)
In circular particle accelerators, storage rings, or colliders, mitigating beam losses is critical to ensuring optimal performance, particularly for rings that include superconducting magnets. A thorough understanding of beam-halo dynamics is essential for this purpose. [...]
arXiv:2410.10708.- 2025-01-29 - 21 p. - Published in : Eur. Phys. J. Plus 140 (2025) 86 Fulltext: Publication - PDF; 2410.10708 - PDF;

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2025-03-04
06:16
Observation of direct CP violation in $D^0$ meson decays at LHCb / Betti, Federico (Bologna U. ; INFN, Bologna)
A search for charge-parity (CP) violation in $D^0$ $\to$ $K^-K^+$ and $D^0$ $\to$ $\pi^- \pi^+$ decays is reported, using $pp$ collision data corresponding to an integrated luminosity of 5.9 fb$^{-1}$ collected at a center-of-mass energy of 13 TeV with the LHCb detector. The flavor of the $D^0$ meson is determined from the charge of the pion in $D*$(2010)$^+ \to D^0$ $\pi^+$ decays or from the charge of the muon in $\bar{B} \to$ $D^0 \mu^-$ $\bar{\nu}_{\mu} X$ decays. [...]
2020 - 6 p. - Published in : Nuovo Cimento C 43 (2020) 41 Fulltext: PDF;
In : 18th Incontri di Fisica delle Alte Energie, Naples, Italy, 8 - 10 April 2019, pp.41

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2025-03-03
17:29
Modeling X-Y Beam Distributions via Crossing of Coupled Resonances in an Accelerator Complex / Lamb, Elleanor
Key words: luminosity, van der Meer, non-factorization, resonance, calibration, losses In high-energy colliders, discoveries are made possible by improving precision and accuracy of the measured rare events [...]
CERN-THESIS-2024-348 - 2024 - 151.


10.5075/epfl-thesis-11431

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2025-03-03
15:16
Characterization, Control and Alignment of Crystal Collimators of the High Luminosity Large Hadron Collider (HL-LHC) / Ricci, Gianmarco
The Large Hadron Collider (LHC), the world’s most powerful particle accelerator, is undergoing a significant upgrade to increase both its luminosity and operational lifespan [...]
CERN-THESIS-2024-347 - 2025 - 166.


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2025-02-28
10:45
Report Accelerator Complex Availability 2024 / Felsberger, Lukas (CERN) ; Alexaki, Paraskevi (National and Kapodistrian University of Athens (GR)) ; Asko, Anti (CERN) ; Charitonidis, Nikolaos (CERN) ; Heron, Jack (CERN) ; Mikulec, Bettina (CERN) ; Rae, Bastien (CERN) ; Uythoven, Jan (CERN) ; Wollmann, Daniel (CERN)
This document summarises the availability of the CERN Accelerator Complex during 2024. [...]
CERN-ACC-NOTE-2025-0003. - 2025
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High Luminosity Large Hadron Collider (HL-LHC) (1,226)
HiLumi LHC (264)