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DYVACS (DYnamic VACuum Simulation) code: gas density profiles for dynamic conditions in particle accelerators - simulations for the LHC and the FCCee
/ Bilgen, Suheyla (IJCLab, Orsay) ; Mercier, Bruno (IJCLab, Orsay) ; Baglin, Vincent (CERN) ; Sattonnay, Gaël (IJCLab, Orsay)
The computation of residual gas density profiles in particle accelerators is an essential task to optimize beam pipes and vacuum system design. In a hadron collider such as the LHC, the beam induces dynamic effects due to ion, electron and photon-stimulated gas desorption. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) THPA161
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPA161
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2.
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DYVACS (DYnamic VACuum Simulation) Code: Gas Density Profiles in Presence of Electron Cloud in the LHC
/ Bilgen, Suheyla (IJCLab, Orsay) ; Baglin, Vincent (CERN) ; Mercier, Bruno (IJCLab, Orsay) ; Sattonnay, Gaël (IJCLab, Orsay)
The computation of residual gas density profiles in particle accelerators is an essential task to optimize beam pipes and vacuum system design. In a hadron collider such as the LHC, the beam induces dynamic effects due to ion, electron, and photon-stimulated gas desorption. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 4373-4376
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4373-4376
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3.
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DYVACS (DYnamic VACuum Simulation) code: Calculation of gas density profiles in presence of electron cloud
/ Sattonnay, Gaël (Orsay, LAL) ; Baglin, Vincent (CERN) ; Bilgen, Suheyla (Orsay, LAL) ; Mercier, Bruno (Orsay, LAL)
The computation of residual gas density evolution in the LHC in the presence of proton beams was performed with a new simulation code called DYVACS (DYnamic VACuum Simulation). It is a modification of the VASCO code in order to take into account dynamic effects such as the electron cloud phenomenon leading to an increase of both the electron- and the ion-induced gas desorption. [...]
CERN-ACC-2019-175.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-TUPMP007
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.TUPMP007
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4.
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Dynamic Pressure in the LHC: Detection of Ions Induced by Ionization of Residual Gas by the Proton Beam and by the Electron-Cloud
/ Bilgen, Suheyla (IJCLab, Orsay) ; Baglin, Vincent (CERN) ; Mercier, Bruno (IJCLab, Orsay) ; Sattonnay, Gaël (IJCLab, Orsay)
Ultra-High Vacuum is an essential requirement to achieve design performances and high luminosities in high-energy particle colliders. Consequently, the understanding of the dynamic pressure evolution during accelerator operation is fundamental to provide solutions to mitigate pressure rises induced by multiple effects leading to beam instabilities. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 4377-4380
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4377-4380
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5.
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Dynamic pressure in the LHC: Influence of ions induced by ionization of residual gas by both the proton beam and the electron cloud
/ Bilgen, Suheyla (Orsay, LAL) ; Baglin, Vincent (CERN) ; Bruni, Christelle (Orsay, LAL) ; Mercier, Bruno (Orsay, LAL) ; Sattonnay, Gaël (Orsay, LAL)
For the future HL-LHC or FCC study, the understanding of the beam interactions with the vacuum chamber is fundamental to provide solutions to mitigate the pressure rises induced by electronic, photonic and ionic molecular desorption. The proton beam circulating in the LHC vacuum chamber ionizes the residual gas producing electrons as well as positive ions. [...]
CERN-ACC-2019-169.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-TUPMP004
Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.TUPMP004
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6.
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Evolution of the LHC Beam Screen Surface Conditioning Upon Electron Irradiation
/ Bilgen, Suheyla (IJCLab, Orsay) ; Baglin, Vincent (CERN) ; Della-Negra, Serge (IJCLab, Orsay) ; Jacquet, Dominique (IJCLab, Orsay) ; Mercier, Bruno (IJCLab, Orsay) ; Ribaud, Isabelle (IJCLab, Orsay) ; Sattonnay, Gaël (IJCLab, Orsay)
For the vacuum scientists and the accelerator community, finding solutions to mitigate pressure rises induced by electron, photon, and ion desorption, and also beam instabilities induced by ion and electron clouds is a major issue. Moreover, it is worth noting that the OFE copper beam screen of the LHC is initially cleaned with standard industrial processes, leading to residual chemical contamination. [...]
Geneva : JACoW, 2021 - 3 p.
- Published in : JACoW IPAC 2021 (2021) 4370-4372
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4370-4372
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7.
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Dynamic pressure evolution during the LHC operation
/ Bilgen, S (IJCLab, Orsay) ; Sattonnay, G (IJCLab, Orsay) ; Mercier, B (IJCLab, Orsay) ; Baglin, V (CERN) ; Henrist, B (CERN)
For the accelerator community and the vacuum scientists, the understanding of the beam interactions with a vacuum chamber is fundamental to provide solutions to mitigate pressure rises induced by electron, photon, and ion molecular desorption. Moreover, beam instabilities induced by ion and electron clouds must be investigated in order to find solutions to reduce them. [...]
2022 - 13 p.
- Published in : Phys. Rev. Accel. Beams 25 (2022) 083101
Fulltext: PDF;
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Mitigation of Electron Cloud Effects in the FCC-ee Collider
/ Yaman, Fatih (Izmir Inst. Tech.) ; Iadarola, Giovanni (CERN) ; Kersevan, Roberto (CERN) ; Ogur, Salim (IJCLab, Orsay) ; Ohmi, Kazuhito (KEK, Tsukuba) ; Zimmermann, Frank (CERN) ; Zobov, Mikhail (Frascati)
Electron clouds forming inside the beam vacuum chamber due to photoemission and secondary emission may limit the accelerator performance. Specifically, the electron clouds can blow up the vertical emittance of a positron beam, through a head-tail-type single-bunch instability, if the central electron density exceeds a certain threshold value, that can be estimated analytically. [...]
arXiv:2203.04872.-
2022-08-17 - 11 p.
- Published in : EPJ Tech. Instrum. 9 (2022) 9
Fulltext: 2203.04872 - PDF; document - PDF;
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Comparison of Different Matching Device Field Profiles for the FCC-ee Positron Source
/ Zhao, Yongke (Shandong U. ; CERN) ; Auchmann, Bernhard (PSI, Villigen) ; Chaikovska, Iryna (IJCLab, Orsay) ; Chehab, Robert (IJCLab, Orsay) ; Craievich, Paolo (PSI, Villigen) ; Döbert, Steffen (CERN) ; Kosse, Jaap (PSI, Villigen) ; Latina, Andrea (CERN) ; Ma, Lianliang (Shandong U.) ; Martyshkin, Pavel (Novosibirsk, IYF) et al.
In this report, we compared different matching device field profiles for the FCC-ee positron source. The matching device is used to capture positrons with magnetic field. [...]
JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 2617-2620
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.2617-2620
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