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2026-06-25
06:43
Time-resolved characterisation of a 10 m discharge plasma for AWAKE / Amoedo, C (CERN ; Lisbon, IST) ; Sublet, A (CERN) ; Torrado, N E (CERN ; Lisbon, IST) ; Silva, F (Lisbon, IST) ; Lopes, N C (Lisbon, IST)
Plasma sources with controlled and reproducible electron densities over metre-scale lengths are essential for extending the acceleration length in plasma-wakefield acceleration (PWFA), while ensuring stable wakefield formation. In the AWAKE experiment, this motivates the development of scalable plasma sources with highly uniform electron density profiles, together with diagnostics capable of characterising them. [...]
2026 - 8 p. - Published in : Plasma Phys. Control. Fusion 68 (2026) 065014 Fulltext: PDF;

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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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