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2026-06-11
06:01
Probing Nucleon Spin Structure with a Polarized Gamma Beam from Compton Backscattering at FCC-ee / Canbay, A C (Ankara U.) ; Sultansoy, S (TOBB ETU, Ankara) ; Zimmermann, F (CERN)
We present a kinematic and optical design of a high-energy polarized gamma-ray facility based on Compton backscattering of lasers against the FCC-ee electron beams in its $Z$, $WW$, $ZH$ and $t\bar{t}$ modes. [...]
arXiv:2606.04805. - 2026 - 17.
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2026-06-10
06:36
Particle adhesion assessment based on a diverted use of laser shock adhesion test (LASAT) to apply inertia force relying on dynamics of the sample macroscopic surface / Baudin, Lucie (CERN) ; Garion, Cedric (CERN) ; Chiggiatto, Paolo ; Delloro, Francesco (Paris, Ecole des Mines) ; Jeandin, Michel (Paris, Ecole des Mines) ; Thorel, Alain (Paris, Ecole des Mines) ; Boustie, Michel (CNRS, France)
Laser-assisted surface structuring was developed at CERN for the treatment of the inside wall of the vacuum system of the Large Hadron Collider (LHC). 50-µm-deep grooves were created by material ablation while the laser scanned the surface. [...]
2024 - 4 p. - Published in : Proc. SPIE 12939 (2024) 129390L

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2026-06-10
06:36
Mixed Neutron and Gamma Effects on Optical Fibers and Coating Materials / Perrot, J (Jean Monnet U.) ; Ferrari, M (Jean Monnet U.) ; Bernardes, A (CERN) ; Morana, A (Jean Monnet U.) ; Avesani, M (Jean Monnet U.) ; Marin, E (Jean Monnet U.) ; Ouerdane, Y (Jean Monnet U.) ; Boukenter, A (Jean Monnet U.) ; Bertrand, J (ANDRA, Chatenay-Malabry) ; Crouvizier, M D (CERN) et al.
This work aims to characterize the vulnerability of radiation-hardened silica-based optical fibers to be implemented in mixed neutron/gamma fields and hydrogen-rich environments. We first investigated radiation effects at microscopic scale, including radiation-induced attenuation (RIA) in the Near- InfraRed (NIR) domain and neutron-induced Refractive Index Changes (RIC). [...]
2025 - 12 p. - Published in : 10.1109/tns.2025.3632769 External link: Fulltext

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2026-06-06
13:49
Beam driven plasma instabilities in electron beam ion sources / Thakur, Chandan (Nehru U.) ; Kumar, Sarvesh (Unlisted, IN) ; Jakhar, Niketan (Nehru U.) ; Kashyap, Sandeep (Amity U. ; Indian Inst. Tech., New Delhi) ; Sharma, Jyotsna (Unlisted, IN) ; Kashyap, Manish K (Nehru U.) ; Pahl, Hannes (CERN) ; Wenander, Fredrik (CERN)
Electron beam ion source (EBIS) is capable of generating highly charged ions by ionizing neutral gas atoms using a high-energy electron beam. The generated ions are confined axially and radially by electric and magnetic fields within the breeding region until they are extracted by lowering the axial potential barrier. [...]
2026 - 11 p. - Published in : Phys. Rev. Accel. Beams 29 (2026) 023401 Fulltext: PDF;

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2026-06-04
04:46
Updates on Impedance Studies for the FCC-ee High Energy Booster / Kim, Keon Hee (GANIL) ; Ghribi, Adnan (GANIL) ; Martinez, Santiago (GANIL) ; Bruant, Quentin (Saclay) ; Chance, Antoine (Saclay) ; Dalena, Barbara (Saclay) ; Antuono, Chiara (CERN) ; Gibellieri, Dora (CERN) ; Zannini, Carlo (CERN) ; Zimmermann, Frank (CERN) et al.
Following the Future Circular Collider (FCC) Feasibility Study completion, the impedance model for the FCC-ee High-Energy Booster (HEB) has been significantly expanded beyond the initial copper vacuum pipe resistive wall analysis. [...]
arXiv:2605.29799. - 2026-06 - 4.
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2026-04-24
11:25
Correctability of Measured Quadrupole Errors in the New Separation Dipoles on the HL-LHC Optics with a Local Skew Quadrupole Corrector / Dilly, Joschua Werner ; Maclean, Ewen Hamish (CERN) ; Tomas Garcia, Rogelio (CERN)
In this study the correctability of the skew quadrupole field errors, as measured in one of the fabricated separation dipoles for the low-beta* insertion regions of the HL-LHC, by means of a locally installed skew quadrupole magnet is evaluated. [...]
CERN-ACC-NOTE-2026-0005. - 2026
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2026-04-21
06:41
Transition-Edge Sensor Spectrometer for Precision Spectroscopy of Antiprotonic Atoms / Morgan, Kelsey (NIST, Boulder) ; Azuma, Toshiyuki (KEK, Tsukuba) ; Baptista, Gonçalo (Paris, Lab. Kastler Brossel) ; Becker, Daniel (Colorado U.) ; Bennett, Douglas (NIST, Boulder) ; Butin, François (CERN) ; Dean, Jonathan W (NIST, Boulder ; Colorado U.) ; Eizenberg, Ofir (Technion) ; Fowler, Joseph W (NIST, Boulder) ; Fujioka, Hiroyuki (ISCT, Tokyo) et al.
antiProtonic Atom X-ray (PAX) spectroscopy is an experiment that aims to test strong-field quantum electrodynamics (QED) effects by performing high-precision X-ray spectroscopy of antiprotonic atoms. PAX will use a low-energy antiproton beam provided by the Extra Low ENergy Antiproton (ELENA) ring at the European Organization for Nuclear Research (CERN) to create antiprotonic atoms. [...]
2026 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 36 (2026) 2101706

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2026-04-16
16:09
Adiabatic Focusing of a Long Proton Bunch in Plasma / Verra, L (CERN) ; Gschwendtner, E (CERN) ; Muggli, P (Munich, Max Planck Inst.)
We show in experiments that a long, relativistic proton bunch is focused by the plasma adiabatic response. [...]
arXiv:2208.12342. - 4.
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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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