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1.
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Correlation of H$^{-}$ beam properties to Cs-coverage
/ Lettry, J (CERN) ; Vnuchenko, A (CERN) ; Bertolo, S (CERN) ; Mastrostefano, C (CERN) ; O'Neil, M (CERN) ; di Lorenzo, F (CERN) ; Coutron, Y (CERN) ; Steyeart, D (CERN) ; Riffaud, B (CERN) ; Thiboud, J (CERN) et al.
A caesiated RF driven source delivers H$^{-}$ ions that, after stripping at the end of the 160 MeV H$^{-}$ linear injector, provides protons to CERN's accelerator complex including LHC, where the protons reached a record energy of 6.8 TeV. In Caesiated RF sources, H$^{-}$ ions are produced via dissociative attachment of electrons onto roto-vibrationally excited H$_{2}$-molecules (volume) and re-emission as negative ions of protons or hydrogen atoms colliding on a low work function caesiated molybdenum plasma electrode (surface). [...]
2023 - 10 p.
- Published in : JINST 18 (2023) C06023
In : 8th International symposium on Negative Ions, Beams and Sources (NIBS'22), Padua, Italy, 2 - 7 Oct 2022, pp.C06023
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2.
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H$^-$ Beam formation simulation in negative ion source for CERN's Linac4 accelerator
/ Vnuchenko, Anna (CERN) ; Lettry, Jacques (CERN) ; Mochalskyy, Serhiy (Garching, Max Planck Inst. Plasmaphys.) ; Wünderlich, Dirk (Garching, Max Planck Inst. Plasmaphys.) ; Fantz, Ursel (LPGP, Orsay) ; Lindqvist, Max (Garching, Max Planck Inst. Plasmaphys.) ; Revel, Adrien (LPGP, Orsay) ; Minea, Tiberiu (LPGP, Orsay)
The caesiated surface negative ion source is the first element of CERN's LINAC4 a linear injector designed to accelerate negative hydrogen ions to 160 MeV. The IS03 ion source is operated at 35 mA beam intensity and reliably feeds CERN's accelerator chain, H- ions are generated via plasma volume and caesiated molybdenum plasma electrode surface mechanisms. [...]
arXiv:2301.13717.-
2023-08-01 - 9 p.
- Published in : JINST 18 (2023) C08001
Fulltext: document - PDF; 2301.13717 - PDF;
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3.
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High-Power Test of Two Prototype X-Band Accelerating Structures Based on SwissFEL Fabrication Technology
/ Millar, William L (CERN) ; Grudiev, Alexej (CERN) ; Wuensch, Walter (CERN) ; Lasheras, Nuria Catalan (CERN) ; McMonagle, Gerard (CERN) ; Zennaro, Riccardo (PSI, Villigen) ; Craievich, Paolo (PSI, Villigen) ; Bopp, Markus (PSI, Villigen) ; Lucas, Thomas G (PSI, Villigen) ; Volpi, Matteo (CERN ; Melbourne U.) et al.
This article presents the design, construction, and high-power test of two X -band radio frequency (RF) accelerating structures built as part of a collaboration between CERN and the Paul Scherrer Institute (PSI) for the compact linear collider (CLIC) study. The structures are a modified “tuning-free” variant of an existing CERN design and were assembled using Swiss free electron laser (SwissFEL) production methods. [...]
2023 - 19 p.
- Published in : IEEE Trans. Nucl. Sci. 70 (2023) 1-19
Fulltext: PDF;
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4.
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Beam Formation Studies on the CERN IS03b H$^-$ Source
/ Lettry, J (CERN) ; Vnuchenko, A (CERN) ; Bertolo, S (CERN) ; Mastrostefano, C (CERN) ; O’Neil, M (CERN) ; di Lorenzo, F (CERN) ; Coutron, Y (CERN) ; Steyeart, D (CERN) ; Riffaud, B (CERN) ; Thiboud, J (CERN) et al.
An H$^{-}$ ion source is being operated at the new 160 MeV linear injector (Linac4) of the CERN accelerator complex. The source’s plasma is of the Radio Frequency Inductively Coupled Plasma type (RF-ICP), without magnetic cusp and runs with Cs-loss compensation 1 . [...]
2022 - 5 p.
- Published in : J. Phys. : Conf. Ser. 2244 (2022) 012036
Fulltext: PDF;
In : 19th International Conference on Ion Sources (ICIS 2021), Vancouver, BC, Canada, 20 - 24 Sep 2021, pp.012036
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5.
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Simulation of Beam Formation in the CERN Negative Ion Source for the Linac4 Accelerator
/ Vnuchenko, A (CERN) ; Lettry, J (CERN) ; Mochalskyy, S (Garching, Max Planck Inst. Plasmaphys.) ; Wünderlich, D (Garching, Max Planck Inst. Plasmaphys.) ; Fantz, U (Garching, Max Planck Inst. Plasmaphys.) ; Revel, A (LPGP, Orsay) ; Minea, T (Garching, Max Planck Inst. Plasmaphys.)
Linac4 is the negative hydrogen ion (H$^{-}$) injector of the CERN accelerator complex. Modelling of the beam formation is essential for optimizing the current and emittance of the H$^{-}$ ion source. [...]
2022 - 5 p.
- Published in : J. Phys. : Conf. Ser. 2244 (2022) 012042
Fulltext: PDF;
In : 19th International Conference on Ion Sources (ICIS 2021), Vancouver, BC, Canada, 20 - 24 Sep 2021, pp.012042
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6.
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Preliminary Simulation of CERN’s Linac4 H⁻ Source Beam Formation
/ Vnuchenko, Anna (CERN) ; Fantz, Ursel (Garching, Max Planck Inst.) ; Lettry, Jacques (CERN) ; Minea, Tiberiu (LPGP, Orsay) ; Mochalskyy, Serhiy (Garching, Max Planck Inst.) ; Revel, Adrien (LPGP, Orsay) ; Wünderlich, Dirk (Garching, Max Planck Inst.)
Linac4 is the new (H⁻) linear injector of CERN’s accelerator complex. This contribution describes the modelling activities required to get insight into H⁻ beam formation processes and their impact on beam properties. [...]
JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 2947-2950
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.2947-2950
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7.
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High-gradient testing of an $S$-band, normal-conducting low phase velocity accelerating structure
/ Vnuchenko, A (Valencia U., IFIC) ; Esperante Pereira, D (Valencia U., IFIC) ; Gimeno Martinez, B (Valencia U., IFIC) ; Benedetti, S (CERN) ; Catalan Lasheras, N (CERN) ; Garlasch, M (CERN) ; Grudiev, A (CERN) ; McMonagle, G (CERN) ; Pitman, S (CERN) ; Syratchev, I (CERN) et al.
A novel high-gradient accelerating structure with low phase velocity, v/c=0.38, has been designed, manufactured and high-power tested. The structure was designed and built using the methodology and technology developed for CLIC 100 MV/m high-gradient accelerating structures, which have speed of light phase velocity, but adapts them to a structure for nonrelativistic particles. [...]
2020 - 13 p.
- Published in : Phys. Rev. Accel. Beams 23 (2020) 084801
Fulltext from Publisher: PDF;
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8.
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Dark current analysis at CERN’s X-band facility
/ Banon Caballero, David (Valencia U., IFIC ; CERN) ; Boronat, Marça (Valencia U., IFIC ; CERN) ; Catalán Lasheras, Nuria (CERN) ; Faus-Golfe, Angeles (Orsay, LAL) ; Gimeno, Benito (Valencia U., IFIC) ; Lucas, Thomas (Melbourne U. ; CERN) ; Millar, William (Lancaster U. ; CERN) ; Paszkiewicz, Jan (U. Oxford (main) ; CERN) ; Pitman, Sam (CERN) ; Sánchez, Victoria (Valencia U., IFIC ; CERN) et al.
Dark current is particularly relevant during operation in high-gradient linear accelerators. Resulting from the capture of field emitted electrons, dark current produces additional radiation that needs to be accounted for in experiments. [...]
CERN-ACC-2019-212; CERN-ACC-2019-270; CLIC-Note-1190.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-WEPRB059
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPRB059
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9.
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Start-to-End Beam Dynamic Simulations for PRAE
/ Vnuchenko, Anna (Valencia U., IFIC) ; Bruni, Christelle (Orsay, LAL) ; El Khaldi, Mohamed (Orsay, LAL) ; Faus-Golfe, Angeles (Orsay, LAL) ; Latina, Andrea (CERN) ; Lepercq, Pierre (Orsay, LAL) ; Vallerand, Cynthia (Orsay, LAL)
The PRAE project (Platform for Research and Applications with Electrons) aims at creating a multidisciplinary R&D; facility in the Orsay campus gathering various scientific communities involved in radiobiology, subatomic physics, instrumentation and particle accelerators around an electron accelerator delivering a high-performance beam with energy up to 70 MeV and later 140 MeV, in order to perform a series of unique measurements and future challenging R&D.; In this paper we report the first start-to-end simulations from the RF gun, going through the linac and finally to the different experimental platforms. The beam dynamics simulations have been performed using a concatenation of codes. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-MOPML044
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPML044
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Publication
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