CERN Accelerating science

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2025-02-19
15:15
LHC Effective Model for Optics Corrections
This thesis investigates the crucial role of higher-order magnetic fields and non-linear optics in the stability and performance of particle accelerators, focusing on the Large Hadron Collider (LHC) at CERN. The control of non- linear optics, which deals with the interaction of charged particle beams with complex magnetic fields such as sextupolar, octupolar, decapolar, and so on, is essential for managing beam dynamics. [...]
CERN-THESIS-2024-336.- 250 p. Fulltext: PDF; External link: Approve this document (restricted)

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2025-02-19
15:07
1998 SL Annual report / Roy, G
CERN-SL-Note-99-027-DI.- Geneva : CERN, 1999 Note

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2025-02-19
04:16
Conical Targets for Enhanced High-Current Positron Sources / Vallis, Nicolas (Minnesota U., Math. ; Northeastern U. ; PSI, Villigen ; CERN ; LPHE, Lausanne) ; Mena-Andrade, Ramiro (CERN) ; Humann, Barbara (CERN) ; Zhao, Yongke (CERN) ; Craievich, Paolo (Minnesota U., Math. ; Northeastern U. ; PSI, Villigen) ; Grenard, Jean-Louis (CERN) ; Latina, Andrea (CERN) ; Perillo-Marcone, Antonio (CERN) ; Zennaro, Riccardo (Minnesota U., Math. ; Northeastern U. ; PSI, Villigen) ; Alharthi, Fahad (IJCLab, Orsay) et al.
Previous pair-production-driven positron source designs have assumed that the transverse dimension of the target is significantly greater than the secondary beam it generates. [...]
arXiv:2502.10565.
- 15.
Fulltext

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2025-02-18
11:41
Development and optimization of novel large area silicon pad sensors for the CMS High Granularity Calorimeter / Paulitsch, Peter
The Large Hadron Collider (LHC) is currently (2024) the largest (27 km in circumference) storage ring and has the highest collision energy (13.6 TeV). While its contributions to high-energy physics remain substantial, more luminosity is needed to obtain sufficient experimental data for new physical discoveries in a reasonable time. [...]
CERN-THESIS-2024-335.- 129 p. Fulltext: PDF; External link: Approve this document (restricted)

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2025-02-18
06:49
Status and challenges of Nb$_3$Sn accelerator magnets at CERN : Lessons learned from ITER to HL-LHC / Devred, A
The High-Luminosity Large Hadron Collider (HL-LHC) project at CERN has offered the opportunity to promote and develop various types of enabling accelerator technologies, such as MgB$_2$ superconducting links for cold powering and Nb$_3$Sn accelerator magnets for the interaction regions where the t [...]
CERN-2025-003 - 2025 - 194. (CERN Yellow Reports: Monographs ; 3/2025)


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2025-02-18
06:49
Multimode Dielectric Resonator for Accurate Determination of Frequency and Temperature Dependence of Complex Permittivity in Small, High-Permittivity Cylinders / Tagdulang, Nikki (CELLS - ALBA, LLS ; Barcelona, Polytechnic U.) ; Krkotić, Patrick (CERN) ; Diez-Comas, Albert (Northeastern U. (main)) ; Pont, Montse (CELLS - ALBA, LLS) ; Manuel O’Callaghan, Juan (Barcelona, Polytechnic U.)
We present a technique to measure permittivity and loss tangent in high-permittivity cylinders. This method utilizes a resonator to conduct concurrent measurements at the three lowest quasi-TE01p modes across various temperatures, combined with an algorithm to fit the loss tangent dependence on frequency and temperature. [...]
2025 - 11 p. - Published in : IEEE Trans. Instrum. Meas. 74 (2025) 8000711 Fulltext: PDF;

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2025-02-18
06:49
A Finite Element $a$-$h$-Formulation for the Reduced Order Hysteretic Magnetization Model for Composite Superconductors / Dular, Julien (CERN) ; Verweij, Arjan (CERN) ; Wozniak, Mariusz (CERN)
The simulation of transient effects in large-scale superconducting systems with the finite element method is computationally expensive. A Reduced Order Hysteretic Magnetization (ROHM) model has been recently proposed for the computation of the magnetization and loss of composite superconductors. [...]
2025 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 35 (2025) 8200205 Fulltext: PDF;

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2025-02-18
06:49
Optimizing the Quench Protection of a 13 T Nb$_3$Sn Common-Coil Magnet / Ravaioli, E (CERN) ; Araujo, D (PSI, Villigen) ; Auchmann, B (PSI, Villigen) ; Verweij, A (CERN) ; Wozniak, M (CERN)
A 13 T Nb$_3$Sn common-coil accelerator-type magnet is being developed at the Paul Scherrer Institute (PSI). The magnet cross-section features an innovative design with asymmetric elements and effective stress-management. [...]
2025 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 35 (2025) 4001206 Fulltext: PDF;

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2025-02-18
06:49
Development of SLA 3D printed volumes for leak testing of LHC Hi-Lumi cryomodules at STFC / Poynton, J O W (Daresbury) ; Wilde, S (Daresbury) ; Bourne, J (Daresbury) ; Jordan, E (Daresbury) ; Templeton, N (Daresbury) ; Matheson, B (TRIUMF) ; Capelli, T (CERN) ; Seller, A (CERN)
Daresbury Laboratory recently completed the build of a Radio Frequency Dipole (RFD) crab cavity cryomodule for the Super Proton Synchrotron (SPS). During the build the team faced challenges leak testing welds which could not be tested in the typical evacuation method. [...]
2025 - 7 p. - Published in : Vacuum 234 (2025) 114090 Fulltext: PDF;

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2025-02-18
06:48
Magnetic and Mechanical Design of the Large Aperture HTS Superconducting Dipoles for the Accelerator Ring of the Muon Collider / Levi, F (INFN, Genoa) ; Alfonso, L (INFN, Genoa) ; Balconi, L (INFN, Milan ; Milan U.) ; Bersani, A (INFN, Genoa) ; Bottura, L (CERN) ; Caiffi, B (INFN, Genoa) ; Fabbri, S (CERN) ; Farinon, S (INFN, Genoa) ; Gagno, A (INFN, Genoa ; Genoa U.) ; Maiello, T (INFN, Genoa ; Genoa U.) et al.
To further explore the physics beyond the capabilities of the LHC and its High-Luminosity Upgrade (HL-LHC), particle physicists are studying advanced accelerators in order to perform finer measurements and/or reach higher energies. Upon the recommendation of the Updated European Strategy for Particle Physics (ESPP), an International Muon Collider Collaboration has been established to investigate the feasibility of a muon collider facility with a center-of-mass energy of 10 TeV. [...]
2025 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 35 (2025) 4000905

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