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CERN Document Server 找到 2,049 筆記錄  1 - 10下一個最後  跳到記錄: 檢索需時 0.45 秒. 
1.
(100)
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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2.
(91)
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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3.
(56)
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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4.
(33)
Towards the Implementation of Laser Engineered Surface Structures for Electron Cloud Mitigation / Sitko, Monika (CERN) ; Abdolvand, Amin (Dundee U.) ; Baglin, Vincent (CERN) ; Bajek, David (Dundee U.) ; Calatroni, Sergio (CERN) ; Chiggiato, Paolo (CERN) ; Colling, Miriam (Daresbury) ; Di Girolamo, Beniamino (CERN) ; Garcia-Tabares Valdivieso, Elisa (CERN) ; Jones, Thomas (Daresbury) et al.
The LHC operation has proven that the electron cloud could be a significant limiting factor in machine performance, in particular for future High Luminosity LHC (HL-LHC) beams. Electron clouds, generated by electron multipacting in the beam pipes, leads to beam instabilities and beam-induced heat load in cryogenic systems. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-TUZGBE3 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUZGBE3
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5.
(31)
Optimization of the secondary electron yield of laser-structured copper surfaces at room and cryogenic temperature / Calatroni, Sergio (CERN) ; Garcia-Tabares Valdivieso, Elisa (CERN) ; Perez Fontenla, Ana Teresa (CERN) ; Taborelli, Mauro (CERN) ; Neupert, Holger (CERN) ; Himmerlich, Marcel (CERN) ; Chiggiato, Paolo (CERN) ; Bajek, David (Dundee U.) ; Wackerow, Stefan (Dundee U.) ; Abdolvand, Amin (Dundee U.)
Electron cloud (e-cloud) mitigation is an essential requirement for proton circular accelerators in order to guarantee beam stability at a high intensity and limit the heat load on cryogenic sections. Laser-engineered surface structuring is considered a credible process to reduce the secondary electron yield (SEY) of the surfaces facing the beam, thus suppressing the e-cloud phenomenon within the high luminosity upgrade of the LHC collider at CERN (HL-LHC). [...]
2020 - 10 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 033101 Fulltext: PDF;
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6.
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An ultra-high vacuum system for secondary electron yield measurements and electron-conditioning of particle accelerators materials at cryogenic temperatures: commissioning and first experiments / Marinoni, Stefano
In the Large Hadron Collider (LHC), the avalanche multiplication of electrons inside the vacuum chamber drives the build-up of an electron cloud, which can impact the performance of the accelerator as it causes a substantial heat load to the cryogenic system [...]
CERN-THESIS-2022-410 - 2022 - 128.

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7.
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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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8.
(24)
First Measurements of Beam-Induced Heating on the LHC Cryogenic System / Brodzinski, K (CERN) ; Tavian, L (CERN)
The Large Hadron Collider (LHC) under operation at CERN is colliding 3.5 TeV hadron beams which are gradually increased in intensity and luminosity. [...]
CERN-ATS-2013-009. - 2013. - 5 p.
Full text
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9.
(22)
Heat load profile estimates on LHC beam screens by thermal transient analysis / Bradu, B (CERN) ; Brodzinski, K (CERN) ; Delikaris, D (CERN) ; Garion, C (CERN) ; Tavian, L (CERN)
The LHC beams are producing significant dynamic heat loads on the LHC cryogenic system. These heat loads are deposited on beam screens, where they must be properly extracted with dedicated cooling loops between 4.6 K and 20 K. [...]
IOP, 2019 - 7 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 502 (2019) 012116 Fulltext: PDF;
In : 27th International Cryogenic Engineering Conference - International Cryogenic Materials Conference 2018, Oxford, United Kingdom, 3 - 7 Sep 2018, pp.012116
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10.
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Role of the different chemical components in the conditioning process of air exposed copper surfaces / Petit, V (CERN ; ONERA, Toulouse) ; Taborelli, M (CERN) ; Neupert, H (CERN) ; Chiggiato, P (CERN) ; Belhaj, M (ONERA, Toulouse)
As a source of heat load on cryogenic sections, the electron cloud is currently a major limitation to the intensity of some modern particle accelerators such as the LHC and its high luminosity upgrade at CERN. During LHC operation, conditioning of the copper beam pipe surface occurs, leading to a decrease of the cloud intensity. [...]
2019 - 10 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 083101 External link: Fulltext
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