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2025-07-02
06:32
Optimization of the Compact Linear Collider rings-to-main-linac at 380 GeV / Zhao, Yongke (CERN) ; Latina, Andrea (CERN)
The baseline configuration of the Compact Linear Collider’s rings-to-main-linac sections has been optimized for the 380 GeV center-of-mass energy stage, and some outstanding issues in previous designs have been resolved. In particular, the bunch compressors have been redesigned to reduce power consumption and cost. [...]
2025 - 11 p. - Published in : Phys. Rev. Accel. Beams 28 (2025) 021003

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2025-07-02
04:08
Chaos indicators for nonlinear dynamics in circular particle accelerators / Montanari, C.E. (Manchester U. ; CERN) ; Appleby, R.B. (Manchester U.) ; Bazzani, A. (Bologna U. ; INFN, Bologna) ; Fornara, A. (Manchester U. ; CERN) ; Giovannozzi, M. (CERN) ; Redaelli, S. (CERN) ; Sterbini, G. (CERN) ; Turchetti, G. (Bologna U.)
The understanding of non-linear effects in circular storage rings and colliders based on superconducting magnets is a key issue for the luminosity the beam lifetime optimisation. A detailed analysis of the multidimensional phase space requires a large computing effort when many variants of the magnetic lattice, representing the realisation of magnetic errors or configurations for performance optimisation, have to be considered. [...]
arXiv:2504.12741.- 2025-06-27 - 23 p. - Published in : Eur. Phys. J. Plus 140 (2025) 603 Fulltext: 2504.12741 - PDF; document - PDF;

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2025-07-01
06:19
Analytical estimates of stress in superconducting dipole magnets for particle accelerators / Todesco, E (CERN) ; Ferracin, P (LBNL, Berkeley) ; Vallone, G (LBNL, Berkeley)
For superconducting accelerator magnets based on an overall current density of the order of 500 A mm$^{−2}$, the electromagnetic forces induce a stress in the winding whose order of magnitude is 100 MPa. This poses special challenges for the mechanical structure, for the insulation, and for the strain induced in the superconductor. [...]
2025 - 11 p. - Published in : Supercond. Sci. Technol. 38 (2025) 065004 Fulltext: PDF;

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2025-07-01
06:19
Crystal collimation of heavy-ion beams at the Large Hadron Collider / Redaelli, S (CERN) ; Aberle, O (CERN) ; Abramov, A (CERN) ; Bruce, R (CERN) ; Cai, R (CERN ; LPHE, Lausanne) ; Calviani, M (CERN) ; D'Andrea, M (CERN) ; Demassieux, Q (CERN) ; Dewhurst, K (CERN) ; Di Castro, M (CERN) et al.
An important upgrade has been deployed for the collimation system of the Large Hadron Collider (LHC) for lead-ion beams that are already planned to reach their high-luminosity target intensity upgrade in the ongoing LHC Run 3 (2022–2026). While certain effects like e-cloud, beam-beam, impedance, injection, and dump protection are relaxed with ion beams, halo collimation becomes an increasing challenge, as the conventional multistage collimation system is about two orders of magnitude less efficient than that for proton beams. [...]
2025 - 12 p. - Published in : Phys. Rev. Accel. Beams 28 (2025) 051001 Fulltext: PDF;

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2025-06-26
07:56
First studies of crystal collimation for the FCC-ee / Broggi, G (Rome U. ; CERN ; Frascati) ; Abramov, A (CERN) ; Boscolo, M (Frascati) ; Bruce, R (CERN) ; Mirarchi, D (CERN) ; Redaelli, S (CERN)
The Future Circular electron–positron Collider (FCC-ee) is being designed to push the energy and luminosity frontiers for lepton colliders. This requires managing unprecedented intensities of lepton beams, with stored beam energies up to 17.5 MJ. [...]
2025 - 6 p.
Fulltext: PDF;
In : 10th International Conference on Charged & Neutral Particles Channeling Phenomena (Channeling 2024), Riccione, Italy, 8 - 13 Sept 2024, pp.170479

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2025-06-25
11:46
The hadron collider FCC-hh : Extended conceptual design report / Schulte, Daniel (CERN) /FCC Collaboration
This document provides a detailed account of several studies regarding the design ofthe FCC-hh hadron collider that have been performed in the time period between 2019and 2021. They extend and complement the studies reported in the conceptual designreport submitted to the 2019 Update of the European Strategy for Particle Physics..
CERN-2025-006.- Geneva : CERN, 2025 - 253 p. CERN Yellow Reports: Monographs, 6/2025 Fulltext: PDF;

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2025-06-25
06:00
Numerical and experimental investigation of AC losses in MgB$_{2}$ wires / Soldati, L (Genoa U.) ; Dular, J (CERN) ; Kovac, J (Bratislava, Electrotech. Inst.) ; Kovac, P (Bratislava, Electrotech. Inst.) ; Cialone, M (Genoa U.) ; Spina, T (ASG Supercond., Genova) ; Bruzek, C-E (ASG Supercond., Genova) ; Wozniak, M (CERN) ; Putti, M (Genoa U. ; Unlisted, IT) ; Breschi, M (Bologna U.)
The efficacy of MgB$_{2}$-based cables for DC power transmission applications is well-established due to several advantageous properties such as the natural abundance and cost-effectiveness of precursor powders and the innate compatibility with liquid hydrogen, which has a boiling point of 20 K. Notably, MgB$_{2}$ has a critical temperature $T_\mathrm{c}$ of 39 K. [...]
2025 - 19 p. - Published in : Supercond. Sci. Technol. 38 (2025) 065019 Fulltext: PDF;

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2025-06-25
06:00
Lumped Parameter Model for Structural Analysis of Over-Constrained Multi-Legged Parallel Mechanism Supporting System Applied to Cryogenic Devices / Piacentini, Luca (Riga Tech. U.) ; Dassa, Luca (CERN) ; Perini, Diego (CERN) ; Ratkus, Andris (Riga Tech. U.) ; Torims, Toms (Riga Tech. U.) ; Uberti, Stefano (U. Brescia)
While the design of a cryostat is being developed, one of the most relevant sub-systems is the internal supporting system that sustains the cooled component. According to the literature, the arrangement and number of supports chosen often result in a multi-leg over-constrained architecture. [...]
2025 - 21 p. - Published in : Machines 13 (2025) 129 Fulltext: PDF; External link: Fulltext

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2025-06-25
06:00
Cryogenic options for future accelerators: case study for the Muon Collider ring / Borges De Sousa, P (CERN) ; Naydenov, B (CERN) ; Delprat, L (CERN) ; Koettig, T (CERN) ; Van Weelderen, R (CERN)
Future, multi-km particle accelerator projects will be under heavy scrutiny to be energetically sustainable. Compared to previous accelerators, these machines must sustain increasingly high beam-induced, static, and dynamic heat loads per meter length. [...]
2025 - 6 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng.: 1327 (2025) , no. 1, pp. 012109
Fulltext: PDF;
In : 26th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2024, Geneva, Switzerland, 22 - 26 July 2024, pp.012109

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2025-06-25
06:00
Design Margin Comparison of a Sextupole-in-Solenoid and a Closed-Loop-Coil Type Nb-Ti Superconducting ECR Magnets / Yang, Ye (LBNL, Berkeley) ; Ferracin, Paolo (LBNL, Berkeley) ; Troitiño, Jose Ferradás (CERN) ; Juchno, Mariusz (LBNL, Berkeley) ; Benitez, Janilee (LBNL, Berkeley) ; Todd, Damon (LBNL, Berkeley) ; Xu, Lianrong (LBNL, Berkeley) ; Duran, Jaime Cruz (LBNL, Berkeley) ; Arbelaez, Diego (LBNL, Berkeley) ; Shen, Tengming (LBNL, Berkeley) et al.
Third-generation electron cyclotron resonance ion sources (ECRISs) have relied on a combination of sextupole and solenoid fields from Nb-Ti superconductors to produce the magnetic fields required for 28 GHz operation. The VENUS ion source at Lawrence Berkeley National Laboratory (LBNL) was the first third-generation ion source optimized for 28 GHz operation, and since that time a similar design has been adopted at other heavy-ion facilities such as RIKEN, GANIL and FRIB. [...]
2025 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 35 (2025) 4100605

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