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Plasma treated metals after H$^-$ irradiation and its effect on vacuum breakdown behaviour
/ Serafim, C. (CERN ; Helsinki Inst. of Phys.) ; Calatroni, S. (CERN) ; Djurabekova, F. (Helsinki Inst. of Phys.) ; Giordano, M.C. (CERN) ; Himmerlich, M. (CERN) ; Bjelland, V. (CERN ; Norwegian U. Sci. Tech.) ; Kouzios, C. (CERN) ; Pinto, P. Costa (CERN) ; Perez-Fontenla, A.T. (CERN) ; Wuensch, W. (CERN) et al.
Vacuum breakdown in accelerator structures is a critical challenge that occurs under high electric fields. In environments subjected to hydrogen ion irradiation or high beam losses, such as in Radio-Frequency Quadrupoles (RFQ), residual hydrocarbons from the vacuum may result in carbon contamination of the metal surfaces from charged particle induced cracking. [...]
arXiv:2503.17360.-
2025-08-01 - 12 p.
- Published in : Phys. Rev. Accel. Beams 28 (2025) 083101
Fulltext: 2503.17360 - PDF; document - PDF;
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Effects of <math display="inline"><mrow><msup><mrow><mi mathvariant="normal">H</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math> low beam irradiation and high field pulsing tests in different metals
/ Serafim, C. (CERN ; Helsinki U.) ; Calatroni, S. (CERN) ; Djurabekova, F. (Helsinki U.) ; Peacock, R. (CERN) ; Bjelland, V. (CERN ; Norwegian U. Sci. Tech.) ; Perez-Fontenla, A.T. (CERN) ; Wuensch, W. (CERN) ; Grudiev, A. (CERN) ; Sgobba, S. (CERN) ; Lombardi, A. (CERN) et al.
This work studies the suitability of a set of different materials for manufacturing of more efficient and durable Radio-Frequency Quadrupole (RFQ) structures compared to that currently used in many linear particle accelerators, traditionally made out of copper. RFQs are susceptible to vacuum breakdowns caused by the exposure to high electric fields, resulting in surface degradation. [...]
arXiv:2409.19698.-
2025-01-01 - 14 p.
- Published in : Phys. Rev. Accel. Beams 28 (2025) 013101
Fulltext: PDF;
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Futur collisionneur circulaire—Rapport d’étude de faisabilité, volume 3 : Génie civil, implantation et durabilité
/ Benedikt, M. (CERN) ; Zimmermann, F. (CERN) ; Auchmann, B. (CERN ; PSI, Villigen) ; Bartmann, W. (CERN) ; Burnet, J.P. (CERN) ; Carli, C. (CERN) ; Chancé, A. (IRFU, Saclay) ; Craievich, P. (PSI, Villigen) ; Giovannozzi, M. (CERN) ; Grojean, C. (DESY ; Humboldt U., Berlin) et al.
CERN-FCC-ACC-2025-0003-FR.-
Geneva : CERN, 2025-03 - 357 p.
- Published in : 10.17181/CERN.WE26.NJC0
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Effect of surface orientation on blistering of copper under high fluence keV hydrogen ion irradiation
/ Lopez-Cazalilla, A. (Helsinki U.) ; Serafim, C. (Helsinki U. ; CERN) ; Kimari, J. (Helsinki U. ; Royal Inst. Tech., Stockholm) ; Ghaemi, M. (Helsinki U.) ; Perez-Fontenla, A.T. (CERN) ; Calatroni, S. (CERN) ; Grudiev, A. (CERN) ; Wuensch, W. (CERN) ; Djurabekova, F. (Helsinki U.)
Copper and hydrogen are among the most common elements that are widely used in industrial and fundamental research applications. Copper surfaces are often exposed to hydrogen in the form of charged ions. [...]
arXiv:2503.12480.-
2025-03-16 - 12 p.
- Published in : Acta Mater. 266 (2024) 119699
Fulltext: Publication - PDF; 2503.12480 - PDF;
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Future Circular Collider Feasibility Study Report Volume 2 : Accelerators, technical infrastructure and safety
/ Benedikt, M. (ed.) (CERN) ; Zimmermann, F. (CERN) ; Auchmann, B. (CERN ; PSI, Villigen) ; Bartmann, W. (CERN) ; Burnet, J.P. (CERN) ; Carli, C. (CERN) ; Chancé, A. (IRFU, Saclay) ; Craievich, P. (PSI, Villigen) ; Giovannozzi, M. (CERN) ; Grojean, C. (DESY ; Humboldt U., Berlin) et al.
In response to the 2020 Update of the European Strategy for Particle Physics, the Future Circular Collider (FCC) Feasibility Study was launched as an international collaboration hosted by CERN. The FCC ‘integrated programme’, described in this report, in a first stage consists of a highest-luminosity electron-positron collider, FCC-ee, serving as Higgs, top and electroweak factory, with a subsequent energy-frontier proton-proton collider, FCC-hh, as the second stage. The FCC-ee is designed to operate at four baseline centre-of-mass energies, corresponding to the Z pole, the WW pair production threshold, the ZH production peak, and the top/anti-top production threshold, always delivering the highest possible luminosities to four experiments. [...]
arXiv:2505.00274; CERN-FCC-ACC-2025-0004.-
Geneva : CERN, 2025 - 627 p.
Fulltext: CERN-FCC-ACC-2025-0004 - PDF; 2505.00274 - PDF;
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Future Circular Collider Feasibility Study Report Volume 3 : Civil Engineering, Implementation and Sustainability
/ Benedikt, M. (CERN) ; Zimmermann, F. (CERN) ; Auchmann, B. (CERN ; PSI, Villigen) ; Bartmann, W. (CERN) ; Burnet, J.P. (CERN) ; Carli, C. (CERN) ; Chancé, A. (IRFU, Saclay) ; Craievich, P. (PSI, Villigen) ; Giovannozzi, M. (CERN) ; Grojean, C. (DESY ; Humboldt U., Berlin) et al.
Volume 3 of the FCC Feasibility Report presents studies related to civil engineering, the development of a project implementation scenario, and environmental and sustainability aspects. The report details the iterative improvements made to the civil engineering concepts since 2018, taking into account subsurface conditions, accelerator and experiment requirements, and territorial considerations. [...]
arXiv:2505.00273; CERN-FCC-ACC-2025-0003.-
Geneva : CERN, 2025-03 - 357 p.
- Published in : 10.17181/CERN.I26X.V4VF
Fulltext: CERN-FCC-ACC-2025-0003 - PDF; 2505.00273 - PDF;
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Future Circular Collider Feasibility Study Report Volume 1 : Physics and Experiments
/ Benedikt, M. (CERN) ; Zimmermann, F. (CERN) ; Auchmann, B. (CERN ; PSI, Villigen) ; Bartmann, W. (CERN) ; Burnet, J.P. (CERN) ; Carli, C. (CERN) ; Chancé, A. (IRFU, Saclay) ; Craievich, P. (PSI, Villigen) ; Giovannozzi, M. (CERN) ; Grojean, C. (DESY ; Humboldt U., Berlin) et al.
Volume 1 of the FCC Feasibility Report presents an overview of the physics case, experimental programme, and detector concepts for the Future Circular Collider (FCC). This volume outlines how the FCC would address some of the most profound open questions in particle physics, from precision studies of the Higgs and EW bosons and of the top quark, to the exploration of physics beyond the Standard Model. [...]
arXiv:2505.00272; CERN-FCC-PHYS-2025-0002.-
Geneva : CERN, 2025 - 290 p.
- Published in : 10.17181/CERN.9DKX.TDH9
Fulltext: CERN-FCC-PHYS-2025-0002 - PDF; 2505.00272 - PDF;
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A Linear Collider Vision for the Future of Particle Physics
/ Linear Collider Vision Collaboration
In this paper we review the physics opportunities at linear $e^+e^-$ colliders with a special focus on high centre-of-mass energies and beam polarisation, take a fresh look at the various accelerator technologies available or under development and, for the first time, discuss how a facility first equipped with a technology mature today could be upgraded with technologies of tomorrow to reach much higher energies and/or luminosities. [...]
arXiv:2503.19983 ; FERMILAB-PUB-25-0216-CSAID-TD.
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162.
Fermilab Library Server - Fulltext - Fulltext
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Investigation on different materials after pulsed high field conditioning and low-energy H- irradiation
/ Serafim, Catarina (CERN ; Helsinki U.) ; Peacock, R. (CERN) ; Calatroni, S. (CERN) ; Djurabekova, F. (Helsinki U.) ; Perez Fontenla, A.T. (CERN) ; Wuensch, W. (CERN) ; Sgobba, S. (CERN) ; Grudiev, A. (CERN) ; Lombardi, A. (CERN) ; Sargsyan, E. (CERN) et al.
During operation, the radio-frequency quadrupole (RFQ) of the LINAC4 at CERN is exposed to high electric fields, which can lead to vacuum breakdown. It is also subject to beam loss, which can cause surface modification, including blistering, which can result in reduced electric field holding and an increased breakdown rate. [...]
arXiv:2410.00084.-
2024-02-21 - 8 p.
- Published in : Front. Phys. 12 (2024) 1308455
Fulltext: fphy-12-1308455 (3) - PDF; 2410.00084 - PDF;
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