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Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions / Haubner, Michal (CERN ; Prague, Tech. U.) ; Krkotic, Patrick (CERN) ; Serafim, Catarina (CERN ; Helsinki U.) ; Petit, Valentine (CERN) ; Baglin, Vincent (CERN) ; Calatroni, Sergio (CERN) ; Henrist, Bernard (CERN) ; Romanov, Artur (Barcelona, Autonoma U.) ; Puig, Teresa (Barcelona, Autonoma U.) ; Gutierrez, Joffre (Barcelona, Autonoma U.)
Particle accelerators with superconducting magnets operating at cryogenic temperatures use a beam screen (BS) liner that extracts heat generated by the circulating bunched charge particle beam before it can reach the magnets. The BS surface, commonly made of high-conductivity copper, provides a low impedance for beam stability reasons, low secondary electron yield (SEY)to mitigate the electron-cloud (EC) effect, and low electron-stimulated desorption yield (ESD) to limit the dynamic pressure rise due to EC. [...]
arXiv:2410.00770.- 2023-02-21 - 15 p. - Published in : Appl. Sciences 13 (2023) 2765 Fulltext: 2410.00770 - PDF; document - PDF;

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Thermo-Mechanical Modeling and Thermal Performance Analysis of Beam Vacuum Line Interconnections and Cold Warm Transitions in HL-LHC Long Straight Section Magnets / Harray, Jérôme (CERN) ; Garion, Cedric (CERN) ; Petit, Valentine (CERN)
The HL-LHC upgrade, aiming at increasing the LHC levelled luminosity by factor of five, relies on new superconducting magnets requiring a new beam vacuum system. Along with the challenges related to magnet design, the beam optic configuration exposes this new equipment to stringent conditions for vacuum and cryogenic performance. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 2839-2842 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.2839-2842

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Origin and Mitigation of the Beam-Induced Surface Modifications of the LHC Beam Screens / Petit, Valentine (CERN) ; Chiggiato, Paolo (CERN) ; Himmerlich, Marcel (CERN) ; Marinoni, Stefano (CERN) ; Neupert, Holger (CERN) ; Taborelli, Mauro (CERN) ; Tavian, Laurent (CERN)
All over Run 2, the LHC beam-induced heat load on the cryogenic system exhibited a wide scattering along the ring. Studies ascribed the heat source to electron cloud build-up, indicating an unexpected high Secondary Electron Yield (SEY) of the beam screen surface in some LHC regions. [...]
2022 - 3 p. - Published in : JACoW IPAC 2022 (2022) 780-782 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.780-782

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Beam-Induced Surface Modification of the LHC Beam Screens: The Reason for the High Heat Load in Some LHC Arcs? / Petit, Valentine (CERN) ; Chiggiato, Paolo (CERN) ; Himmerlich, Marcel (CERN) ; Iadarola, Giovanni (CERN) ; Neupert, Holger (CERN) ; Taborelli, Mauro (CERN) ; Zanin, Danilo A (CERN)
All over Run 2, the LHC beam-induced heat load exhibited a wide scattering along the ring. Studies ascribed the heat source to electron cloud build-up, indicating an unexpectedly high Secondary Electron Yield (SEY) of the beam screen surface in some LHC regions. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 3479-3482 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3479-3482

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Progress in Mastering Electron Clouds at the Large Hadron Collider / Iadarola, Giovanni (CERN) ; Bradu, Benjamin (CERN) ; Mether, Lotta (CERN) ; Paraschou, Konstantinos (CERN) ; Petit, Valentine (CERN) ; Rumolo, Giovanni (CERN) ; Sabato, Luca (CERN) ; Skripka, Galina (CERN) ; Taborelli, Mauro (CERN) ; Tavian, Laurent (CERN)
During the second operational run of the Large Hadron Collider (LHC) a bunch spacing of 25 ns was used for the first time for luminosity production. With such a spacing, electron cloud effects are much more severe than with the 50-ns spacing, which had been used in the previous run. [...]
JACoW, 2021 - 6 p. - Published in : JACoW IPAC 2021 (2021) 1273-1278 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1273-1278

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Beam-induced surface modifications as a critical source of heat loads in the Large Hadron Collider / Petit, Valentine (CERN) ; Taborelli, Mauro (CERN) ; Zanin, Danilo Andrea (CERN) ; Himmerlich, Marcel (CERN) ; Neupert, Holger (CERN) ; Chiggiato, Paolo (CERN) ; Iadarola, Giovanni (CERN)
Beam-induced heat loads on the cryogenic regions of the Large Hadron Collider (LHC) exhibit a wide and unexpected dispersion along the accelerator, with potential impact on the performance of its High-Luminosity upgrade. Studies related the heat load source to the avalanche multiplication of electrons at the surface of the beam vacuum chamber, a phenomenon known as electron could build-up. [...]
2021 - 10 p. - Published in : Commun. Phys. 4 (2021) 192 Fulltext: PDF;

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Conditioning of Surfaces in Particle Accelerators / Petit, Valentine
The electron cloud developing in the vacuum chambers of the LHC during the proton beam operation is responsible for heat load on the cryogenic system of the superconduct- ing magnets [...]
CERN-THESIS-2019-358 - 194 p.

10.17181/CERN.941V.OBEC
Full text

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Se också: liknande författarnamn
56	Petit, V
11	Petit, Veronique
1	Petit, Vincent
11	Petit, Véronique

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