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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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Linac3, LEIR and PS Performance with Ions in 2021 and Prospects for 2022
/ Biancacci, Nicolo (CERN) ; Albright, Simon (CERN) ; Alemany-Fernández, Reyes (CERN) ; Alves, Diogo (CERN) ; Angoletta, Maria Elena (CERN) ; Barrientos, Diego (CERN) ; Bartosik, Hannes (CERN) ; Bellodi, Giulia (CERN) ; Bertolo, Sebastien (CERN) ; Bodart, Dominique (CERN) et al.
CERN accelerators underwent a period of long shutdown from the end of 2018 to 2020. During this time frame, significant hardware and software upgrades have been put in place to increase the performance of both proton and ion accelerator chains in the High Luminosity LHC era. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 1983-1986
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1983-1986
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3.
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Linac4 H$^-$ source R&D;: Cusp free ICP and magnetron discharge
/ Lettry, J (CERN) ; Bertolo, S (CERN) ; Fantz, U (Garching, Max Planck Inst.) ; Guida, R (CERN) ; Kapusniak, K (CERN) ; Di Lorenzo, F (CERN) ; Machado, C (CERN) ; Mastrostefano, C (CERN) ; Minea, T (LPGP, Orsay) ; O'Neil, M (CERN) et al.
The 2MHz radio-frequency inductively coupled plasma heating (ICP RF) of Linac4’s IS03 H-
source is more
efficient without its octupole cusp in offset hallbach configuration. This was shown by Particle in cell Monte-Carlo (PICMC) simulation using the NINJA software [1] and confirmed by plasma characterization via optical emission spectroscopy
[2,3], an easier plasma ignition is also anticipated. [...]
2018 - 6 p.
- Published in : AIP Conf. Proc. 2052 (2018) 050008
In : 6th International Symposium on Negative Ions, Beams and Sources, Novosibirsk, Russia, 3 - 7 Sep 2018, pp.050008
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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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6.
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Linac4: Reliability run results and source extraction studies
/ Noll, Daniel (CERN) ; Bellodi, Giulia (CERN) ; Bertolo, Sebastien (CERN) ; Di Lorenzo, Francesco (CERN) ; Lallement, Jean-Baptiste (CERN) ; Lettry, Jacques (CERN) ; Lombardi, Alessandra (CERN) ; Mastrostefano, Cristiano (CERN) ; Mikulec, Bettina (CERN) ; O'Neil, Michael (CERN) et al.
Linac4, a 160 MeV, 352.2 MHz linear accelerator, has been fully commissioned and will take its place as injector to the CERN chain of accelerators during the long shutdown (LS2) in 2019-2020. In the past year, it has been providing beam during a test run to assess its reliability in view of the connection to the LHC proton injector chain. [...]
CERN-ACC-2019-096.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-MOPTS096
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS096
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7.
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Activities at the Linac4 Test Stand
/ Lallement, Jean-Baptiste (CERN) ; Bencini, Vittorio (CERN) ; Bertolo, Sebastien (CERN) ; Di Lorenzo, Francesco (CERN) ; Lettry, Jacques (CERN) ; Lombardi, Alessandra (CERN) ; Mastrostefano, Cristiano (CERN) ; Noll, Daniel (CERN) ; O'Neil, Michael (CERN)
Linac4, the new CERN H$^-$ injector to the Proton Synchrotron Booster, has been commissioned and has delivered a beam intensity and quality calculated to be sufficient to produce the standard beams for LHC and the high intensity beams for ISOLDE when connected. The beam current is nevertheless half of what is foreseen and the problem has been identified at the low energy end, between the extraction and the matching to the RFQ. [...]
CERN-ACC-2018-198.-
2018 - 4 p.
- Published in : 10.18429/JACoW-LINAC2018-TUPO127
Fulltext: tupo127 - PDF; tupo127_2 - PDF;
In : 29th International Linear Accelerator Conference, Beijing, China, 16 - 21 Sep 2018, pp.TUPO127
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8.
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CERN’s Linac4 cesiated surface H$^{-}$ source
/ Lettry, J (CERN) ; Aguglia, D (CERN) ; Bertolo, S (CERN) ; Briefi, S ; Butterworth, A (CERN) ; Coutron, Y (CERN) ; Dallocchio, A (CERN) ; David, N (CERN) ; Chaudet, E (CERN) ; Fantz, U et al.
Linac4 cesiated surface H$^{-}$ sources are routinely operated for the commissioning of the CERN’s Linac4 and on an ion source test stand. Stable current of 40-50 mA are achieved but the transmission through the LEBT of 80% was below expectations and triggered additional beam simulation and characterization. [...]
2017
- Published in : AIP Conf. Proc. 1869 (2017) 030002
In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030002
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9.
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Linac4 H− ion sources
/ Lettry, J (CERN) ; Aguglia, D (CERN) ; Alessi, J (RIKEN BNL) ; Andersson, P (CERN) ; Bertolo, S (CERN) ; Briefi, S (Augsburg U.) ; Butterworth, A (CERN) ; Coutron, Y (CERN) ; Dallocchio, A (CERN) ; David, N (CERN) et al.
CERN’s 160 MeV H−linear accelerator (Linac4) is a key constituent of the injector chain upgrade of the Large Hadron Collider that is being installed and commissioned. A cesiated surface ion source prototype is being tested and has delivered a beam intensity of 45 mA within an emittance of 0.3 π ⋅ mm ⋅ mrad. [...]
2015
- Published in : Rev. Sci. Instrum. 87 (2015) 02B139
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10.
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Status and Operation of the Linac4 Ion Source Prototypes
/ Lettry, J (CERN) ; Aguglia, D (CERN) ; Andersson, P (CERN) ; Bertolo, S (CERN) ; Butterworth, A (CERN) ; Coutron, Y (CERN) ; Dallocchio, A (CERN) ; Chaudet, E (CERN) ; Gil-Flores, J (CERN) ; Guida, R (CERN) et al.
CERN’s Linac4 45 kV H- ion sources prototypes are installed at a dedicated ion source test stand and in the Linac4 tunnel. The operation of the pulsed hydrogen injection, RF sustained plasma and pulsed high voltages are described. [...]
CERN-ACC-2014-0342.-
Geneva : CERN, 2014 - 4 p.
Fulltext: PDF;
In : 15th International Conference on Ion Sources, Chiba, Japan, 9 - 13 Sep 2013, pp.Ion Sources
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