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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-$\beta^*$ 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-$\beta^*$ 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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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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