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1.
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Performance of laser patterned copper plasmonic photocathodes
/ Martinez-Calderon, M (CERN) ; Groussin, B (CERN) ; Bjelland, V (CERN ; Norwegian U. Sci. Tech.) ; Chevallay, E (CERN) ; Himmerlich, M (CERN) ; Lorenz, P (Unlisted, DE) ; Marsh, B (CERN) ; Neupert, H (CERN) ; Rossel, R (CERN) ; Wuensch, W (CERN) et al.
We study ultrafast laser surface nanopatterning as an alternative to improve the photo-emissive properties of metallic photocathodes. By tailoring the physical dimensions of these surface nanostructures, one can localize the optical field intensity and exploit plasmonic effects occurring in such nanostructures. [...]
2024 - 6 p.
- Published in : J. Phys. : Conf. Ser.: 2687 (2024) , no. 3, pp. 032033
- Published in : JACoW IPAC: 2023 (2023) , pp. TUPA003
Fulltext: PublicationJACOW - PDF; PublicationIOP - PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.032033
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2.
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Hot electron enhanced photoemission from laser fabricated plasmonic photocathodes
/ Martinez-Calderon, Miguel (CERN) ; Groussin, Baptiste (CERN) ; Bjelland, Victoria (CERN ; Norwegian U. Sci. Tech.) ; Chevallay, Eric (CERN) ; Fedosseev, Valentin N (CERN) ; Himmerlich, Marcel (CERN) ; Lorenz, Pierre ; Manjavacas, Alejandro ; Marsh, Bruce A (CERN) ; Neupert, Holger (CERN) et al.
Photocathodes are key elements in high-brightness electron sources and ubiquitous in the operation of large-scale accelerators, although their operation is often limited by their quantum efficiency and lifetime. Here, we propose to overcome these limitations by utilizing direct-laser nanostructuring techniques on copper substrates, improving their efficiency and robustness for next-generation electron photoinjectors. [...]
2023 - 9 p.
- Published in : 10.1515/nanoph-2023-0552
Fulltext: PDF;
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3.
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The Role of Hydrogen Incorporation into Amorphous Carbon Films in the Change of the Secondary Electron Yield
/ Bundaleski, Nenad (New Lisbon U.) ; Adame, Carolina F. (New Lisbon U.) ; Alves, Eduardo (IST, Lisbon ; Lisbon U.) ; Barradas, Nuno P. (IST, Lisbon ; Lisbon U.) ; Cerqueira, Maria F. (Minho U.) ; Deuermeier, Jonas (New Lisbon U.) ; Delaup, Yorick ; Ferraria, Ana M. (IST, Lisbon) ; Ferreira, Isabel M.M. (New Lisbon U.) ; Neupert, Holger (CERN) et al.
Over the last few years, there has been increasing interest in the use of amorphous carbon thin films with low secondary electron yield (SEY) to mitigate electron multipacting in particle accelerators and RF devices. Previous works found that the SEY increases with the amount of incorporated hydrogen and correlates with the Tauc gap. [...]
2023 - 20 p.
- Published in : Int. J. Molecular Sci. 24 (2023) 12999
Fulltext: PDF;
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4.
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RF characterisation of laser treated copper surfaces for the mitigation of electron cloud in accelerators
/ Krkotic, Patrick (CERN) ; Calatroni, Sergio (CERN) ; Abdolvand, Amin (Dundee U.) ; Perez Fontenla, Ana Teresa (CERN) ; Neupert, Holger (CERN) ; Himmerlich, Marcel (CERN) ; Wackerow, Stefan (Dundee U.)
In accelerator beam chambers and RF waveguides, electron cloud and multipacting can be mitigated effectively by reducing the secondary electron yield (SEY). In recent years, it has been established that laser surface structuring is a very efficient method to create a copper surface with SEY close to or even below unity. [...]
2023 - 4 p.
- Published in : JACoW IPAC2023 (2023) THPA137
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPA137
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5.
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Amorphous carbon thin films: Mechanisms of hydrogen incorporationduring magnetron sputtering and consequences for the secondary electronemission
/ Adame, C F ; Alves, E (Lisbon, IST) ; Barradas, N P (Lisbon, IST) ; Costa Pinto, P (CERN) ; Delaup, Y (CERN) ; Ferreira, I M M ; Neupert, H (CERN) ; Himmerlich, M (CERN) ; Pfeiffer, S (CERN) ; Rimoldi, M (CERN) et al.
Amorphous carbon (a-C) films, having low secondary electron yield (SEY), are usedat CERN to suppress electron multipacting in the beam pipes of particleaccelerators. It was already demonstrated that hydrogen impurities increase theSEY of a-C films. [...]
2023 - 14 p.
- Published in : J. Vac. Sci. Technol. A 41 (2023) 043412
Fulltext: PDF;
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6.
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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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7.
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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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8.
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9.
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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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