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2026-04-15
11:31
III.6 — Beam coupling impedance measurements with beam and on a bench / Biancacci, Nicolò (CERN)
The beam coupling impedance is one of the key quantities describing the interaction between aparticle beam travelling in a particle accelerator and its surroundings. Under specific circumstances,the impedance can lead to severe beam instabilities which limit the overall performance of a runningaccelerator or pose challenges for the achievement of a project.In this contribution, we present the main techniques in use to characterize the impedance either withbeam-based procedures, or with RF measurements on a test bench. [...]
2024 - 28 p. - Published in : CERN Yellow Rep. School Proc. 3 (2024) 2029-2056 External link: Fulltext
In : Proceedings of the Joint Universities Accelerator School (JUAS) : Courses and exercises, Geneva, Switzerland, 27 Nov 2024, pp.2029-2056 (CERN-2024-003)

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2026-04-15
06:59
Terahertz and Optical Acceleration Techniques / Kärtner, Franz X (DESY ; CFEL, Hamburg)
The use of terahertz (THz) and optical radiation for electron acceleration and manipulation of electron bunches has progressed over the last decade to a level where practical devices for THz guns, THz and optical acceleration modules and a wide range of beam manipulations have become possible. [...]
arXiv:2604.05691. - 2026 - 13.
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2026-04-01
06:18
Development of radiation-tolerant beam imaging via multimode fiber and synthetic data-driven machine learning / Xu, Q (Cockcroft Inst. Accel. Sci. Tech. ; CERN ; U. Liverpool (main)) ; Zhang, H D (Cockcroft Inst. Accel. Sci. Tech. ; U. Liverpool (main)) ; Trad, G (CERN) ; Hill, A (Cockcroft Inst. Accel. Sci. Tech. ; U. Liverpool (main)) ; Roncarolo, F (CERN) ; Welsch, C P (Cockcroft Inst. Accel. Sci. Tech. ; U. Liverpool (main))
Transverse beam profile monitoring in high-radiation areas is challenging due to camera degradation. A proposed solution employs a multimode fiber (MMF) to relay optical signals from the radiation zone to a shielded area, where a standard CMOS camera can operate safely. [...]
2026 - 12 p. - Published in : Phys. Rev. Accel. Beams 29 (2026) 032801 Fulltext: PDF;

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2026-03-26
06:11
Study of the Run-3 muon flux at the SND@LHC experiment / SND@LHC Collaboration
Long-range muons produced in proton-proton collisions at the ATLAS interaction point constitute the primary background for neutrino interaction searches at the SND@LHC experiment. [...]
arXiv:2603.21878. - 11.
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2026-03-11
06:20
Improved thermal monitoring in particle accelerators using FBGs: first insights from the iPipe Project in LHC Run 3 / Fienga, Francesco (U. Naples (main) ; CERN) ; Marrazzo, Vincenzo Romano (U. Naples (main) ; CERN) ; Sito, Leonardo (U. Naples (main) ; CERN) ; Beni, Noemi (Debrecen, Inst. Nucl. Res. ; CERN) ; Szillasi, Zoltan (Debrecen, Inst. Nucl. Res. ; CERN) ; Irace, Andrea (U. Naples (main)) ; Zeuner, Wolfram (CERN) ; Salvant, Benoit (CERN) ; Buontempo, Salvatore (Salento U. ; INFN, Naples ; CERN) ; Breglio, Giovanni (U. Naples (main) ; CERN)
Particle accelerators, such as the Large Hadron Collider (LHC) at CERN, are planning to increase the intensity of circulating particle beams. However, this upgrade faces challenges due to beam-induced heating that can lead to operational issues and component damage. [...]
2023 - Published in : 10.1364/OFS.2023.Th6.42
In : 28th International Conference on Optical Fiber Sensors (OFS 2023), Naka-ku, Japan, 20 - 24 Nov 2023

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2026-02-27
04:10
X-ray reflection: a FLUKA model and its application in the design of synchrotron light beamlines and CERN's Future Circular Collider / Mazzola, Giuseppe (CERN) ; Chitra, Sunil (Argonne) ; Devienne, Arnaud (CERN) ; Frasca, Alessandro (CERN ; Liverpool U.) ; Fusté, María José García (CELLS - ALBA, LLS) ; Heinis, Dominique (CELLS - ALBA, LLS) ; Lechner, Anton (CERN) ; Lerner, Giuseppe (CERN) ; Rebuffi, Luca (Argonne) ; del Rio, Manuel Sanchez (ESRF, Grenoble) et al.
Relying on atomic scattering factors from evaluated databases, a new model for the reflectivity of x rays on solid surfaces has been developed for FLUKA v4-6.0. [...]
arXiv:2602.09672. - 14.
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2026-02-26
07:31
Post long shutdown 2 CERN proton synchrotron transverse impedance model: Description and beam-based validation / Joly, Sébastien (U. Rome La Sapienza (main)) ; Migliorati, Mauro (INFN, Rome) ; Mounet, Nicolas (CERN) ; Salvant, Benoît (CERN)
In the framework of the LHC Injectors Upgrade project, the CERN Proton Synchrotron underwent hardware changes during the Long Shutdown 2. These changes required an update of the CERN Proton Synchrotron impedance model and an assessment of their impact on beam quality. [...]
arXiv:2505.09328.- 2026 - 19 p. - Published in : Phys. Rev. Accel. Beams 29 (2026) 024201 Fulltext: 2505.09328 - PDF; document - PDF;

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2026-02-20
04:53
Measurement of the Saturation Length of the Self-Modulation Instability / Clairembaud, A. (Munich, Max Planck Inst.) ; Turner, M. (CERN) ; Bergamaschi, M. (CERN) ; Ranc, L. (Munich, Max Planck Inst.) ; Pannell, F. (University Coll. London) ; Mezger, J. (Munich, Max Planck Inst.) ; Jaworska, H. (CERN) ; van Gils, N. (CERN ; Groningen U.) ; Farmer, J. (Munich, Max Planck Inst.) ; Muggli, P. (Munich, Max Planck Inst. ; CERN)
The self-modulation (SM) instability transforms a long charged particle bunch traveling in plasma into a train of microbunches that resonantly drives large-amplitude wakefields. [...]
arXiv:2602.16624. - 8.
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2026-02-19
06:19
Optical beam loss monitor installed at the SPS slow extraction region / King, Montague (CERN ; U. Liverpool (main)) ; Benitez Berrocal, Sara (CERN) ; Effinger, Ewald (CERN) ; Esteban, Jose (CERN) ; Kearney, Joe (CERN) ; Meyer, Jean Michel (CERN) ; Salvachua, Belen (CERN) ; Welsch, Carsten (U. Liverpool (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Wolfenden, Joseph (U. Liverpool (main) ; Cockcroft Inst. Accel. Sci. Tech.)
An optical beam loss monitor (oBLM) has recently been installed at the slow extraction region of the Super Proton Synchrotron (SPS) at CERN. The oBLM offers a new method for detecting beam losses at the SPS by utilizing the Cherenkov radiation emitted during beam loss interactions with an optical fibre. [...]
2026 - 4 p. - Published in : JACoW IBIC 2025 (2026) 86 Fulltext: PDF;
In : 14th International Beam Instrumentation Conference (IBIC 2025), Liverpool, United Kingdom, 7-11 Sep 2025, pp.86

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2026-02-19
06:19
Performance of the Beam Gas Curtain as emittance monitor at the Large Hadron Collider / Butti, Daniele (CERN) ; Lefevre, Thibaut (CERN) ; Mazzoni, Stefano (CERN) ; Pasquino, Chiara (CERN) ; Schneider, Gerhard (CERN) ; Veness, Raymond (CERN) ; Sedlacek, Ondrej (U. Liverpool (main)) ; Stringer, Oliver (U. Liverpool (main) ; CERN) ; Welsch, Carsten (U. Liverpool (main)) ; Zhang, Hao (U. Liverpool (main) ; CERN) et al.
The Beam Gas Curtain (BGC) is an instrument for transverse diagnostics in operation at the Large Hadron Collider (LHC). The transverse beam profile is obtained by imaging the fluorescence light resulting from the interaction between the beam and a thin supersonic neon gas jet. [...]
2026 - 4 p. - Published in : JACoW IBIC 2025 (2026) 346 Fulltext: PDF;
In : 14th International Beam Instrumentation Conference (IBIC 2025), Liverpool, United Kingdom, 7-11 Sep 2025, pp.346

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