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2025-04-24
11:01
LHC MD #12263 - Weak-Strong investigation of Long-Range Beam-beam / Persson, Tobias Hakan Bjorn (CERN) ; Buffat, Xavier (CERN) ; Carlier, Felix Simon (CERN) ; Burkhardt, Felix (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Dilly, Joschua Werner (CERN) ; Hostettler, Michi (CERN) ; Kar, Ujani (University of Applied Sciences (DE)) ; Maclean, Ewen Hamish (CERN) ; Tomas Garcia, Rogelio (CERN)
During the intensity ramp-up in 2024, it was revealed that the collimation hierarchy was broken under normal operational conditions with bunch trains. [...]
CERN-ACC-NOTE-2025-0011. - 2025
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2025-04-24
10:54
LHC MD #11883: Optics functions determination using luminosity data / Persson, Tobias Hakan Bjorn (CERN) ; Wanczyk, Joanna
Measuring the betatron waist shift in the Large Hadron Collider (LHC) via conventional k-modulation has proven challenging, motivating the need for alternative techniques. [...]
CERN-ACC-NOTE-2025-0010. - 2025

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2025-04-22
15:54
Direct wire offset measurement by photogrammetry including a gravity link / Barcet, Florian ; Bestmann, Patrick (CERN) ; Mergelkuhl, Dirk (CERN)
This paper presents a novel method for direct wire offset measurements using photogrammetry, with a focus on in- tegrating a link to gravity. [...]
CERN-ACC-NOTE-2024-0028. - 2024 - 7.
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2025-04-15
15:07
Impact of Measured Quadrupole Errors in the New Separation Dipoles on the HL-LHC Optics / Dilly, Joschua Werner (CERN) ; Maclean, Ewen Hamish (CERN) ; Tomas Garcia, Rogelio (CERN)
In this study the impact and correctability of the quadrupole field errors, as measured in the newly fabricated separation dipoles for the low-β∗ insertion regions of the HL-LHC, are evaluated. [...]
CERN-ACC-NOTE-2025-0009. - 2025 - 51.
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2025-04-15
14:54
Impact of Expected Quadrupole Errors in the New Separation Dipoles on the HL-LHC Optics / Dilly, Joschua Werner (CERN) ; Maclean, Ewen Hamish (CERN) ; Tomas Garcia, Rogelio (CERN)
In this study the impact and correctability of the quadrupole field errors, as measured in the newly fabricated separation dipoles for the low-β∗ insertion regions of the HL-LHC, are evaluated. [...]
CERN-ACC-NOTE-2025-0008. - 2025 - 51.
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2025-04-07
15:36
Impactof bunch intensity asymmetry in colliders featuring strong beamstrahlung / Le Nguyen Nguyen, Khoi (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Buffat, Xavier (CERN) ; Kicsiny, Peter ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH))
An analytical investigation of beamstrahlung induced longitudinal blow-up in Gaussian beams with asymmetric bunch lengths is presented, using approximations for the beam profile. [...]
CERN-ACC-NOTE-2025-0007. - 2025 - 24.

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2025-04-04
15:17
Deriving the Normal Form F Terms with SUSSIX Simulation Analysis / Schmidt, Frank
Normal Form techniques have been provided to MAD-X via the PTC Code. [...]
CERN-ACC-2024-0006. - 2024 - 25.

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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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High Luminosity Large Hadron Collider (HL-LHC) (1,226)
HiLumi LHC (264)