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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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Efficient Combination of Surface Texturing and Functional Coating for Very Low Secondary Electron Yield Surfaces and Rough Nonevaporable Getter Films
/ Himmerlich, Marcel (CERN) ; Zanin, Danilo A (CERN) ; Taborelli, Mauro (CERN) ; Granadeiro Costa, Angelo Rafael (CERN) ; Costa Pinto, Pedro (CERN) ; Lain Amador, Lucia (CERN) ; Vollenberg, Wilhelmus (CERN) ; Baris, Adrienn (CERN) ; Garcia‐Tabares Valdivieso, Elisa (CERN ; Carlos III U., Madrid) ; Perez Fontenla, Ana Teresa (CERN) et al.
The formation of a fissured copper surface by picosecond pulsed laser irradiation is combined with functional coatings consisting of Ti and amorphous carbon layers or a Ti–Zr–V compound film to fabricate surfaces with the maximum of the secondary electron yield being as low as 0.4. By structural and spectroscopic analysis of the formed surfaces it is demonstrated that both coatings enclose the nanostructures generated by redeposition of metal structures from the laser-induced plasma plume, keeping the initial topography intact. [...]
2022 - 8 p.
- Published in : Advanced Materials Interfaces 10 (2022) 2201671
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Amorphous Carbon Coating in SPS
/ Vollenberg, Wil (CERN) ; Chiggiato, Paolo (CERN) ; Costa Pinto, Pedro (CERN) ; Cruikshank, Paul (CERN) ; Moreno, Harold (CERN) ; Pasquino, Chiara (CERN) ; Perez Espinos, Jaime (CERN) ; Taborelli, Mauro (CERN)
Within the LHC Injector Upgrade (LIU) project, the Super Proton Synchrotron (SPS) needs to be upgraded to inject into the LHC higher intensity and brighter 25-ns bunch spaced beams. To mitigate the Electron Multipacting (E.M.) phenomenon, a well-known limiting factor for high-intensity positively charged beams, CERN developed carbon coatings with a low Secondary Electron Yield (SEY). [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 3475-3478
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3475-3478
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New Generation CERN LHC Injection Dump - Assembly and Installation (TDIS)
/ Carbajo Perez, David (CERN) ; Berthomé, Emmanuel (CERN) ; Bertone, Caterina (CERN) ; Biancacci, Nicolo (CERN) ; Bracco, Chiara (CERN) ; Bregliozzi, Giuseppe (CERN) ; Bulat, Bartosz (CERN) ; Cadiou, Cyril (CERN) ; Calviani, Marco (CERN) ; Cattenoz, Gregory (CERN) et al.
During CERN’s LS2, several upgrades were performed to beam intercepting devices in the framework of the HL-LHC Project. Upgraded equipment includes two internal beam dumps (TDIS) intended for machine protection located at the injection points from the SPS to the LHC. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 3548-3551
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3548-3551
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Single Bunch Instabilities and NEG Coating for FCC-ee
/ Belli, Eleonora (Rome U.) ; Costa Pinto, Pedro (CERN) ; Migliorati, Mauro (INFN, Rome) ; Rumolo, Giovanni (CERN) ; Sapountzis, Antonios (CERN) ; Sinkovits, Theo (CERN) ; Taborelli, Mauro (CERN) ; Zobov, Mikhail (Frascati)
The high luminosity electron-positron collider FCC-ee is part of the Future Circular Collider (FCC) study at CERN and it has been designed to cover the beam energy range from 45.6 GeV to 182.5 GeV to study the properties of the Higgs boson and other particles. Electron cloud build up simulations on the Z resonance revealed the necessity of minimising the Secondary Electron Yield (SEY) of the pipe walls by applying a Ti-Zr-V Non-Evaporable Getter (NEG) coating in the entire ring. [...]
JACOW, 2019 - 7 p.
- Published in : 10.18429/JACoW-eeFACT2018-WEOAB04
Published fulltext: PDF;
In : 62nd ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e− Colliders, Hong Kong, China, 24 - 27 Sep 2018, pp.WEOAB04
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Cryogenic surface resistance of copper: Investigation of the impact of surface treatments for secondary electron yield reduction
/ Calatroni, Sergio (CERN) ; Arzeo, Marco (CERN) ; Aull, Sarah (CERN) ; Himmerlich, Marcel (CERN) ; Costa Pinto, Pedro (CERN) ; Vollenberg, Wilhelmus (CERN) ; Di Girolamo, Beniamino (CERN) ; Cruikshank, Paul (CERN) ; Chiggiato, Paolo (CERN) ; Bajek, David (U. Dundee) et al.
The surface resistance of copper samples with an amorphous carbon (a-C) coating or with laser surface structuring, the surface treatments of choice for electron cloud suppression in critical cryogenic sectors of the high-luminosity upgrade of the Large Hadron Collider (HL-LHC), has been measured for the first time at a cryogenic temperature using the quadrupole resonator at CERN. Three different frequencies of relevance for evaluating beam impedance effects, namely, 400, 800, and 1200 MHz, have been investigated. [...]
2019 - 9 p.
- Published in : Phys. Rev. Accel. Beams 22 (2019) 063101
Fulltext from Publisher: PDF;
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Electron Cloud Studies in FCC-ee
/ Belli, Eleonora (CERN) ; Costa Pinto, Pedro (CERN) ; Migliorati, Mauro (Rome U. ; INFN, Rome) ; Rumolo, Giovanni (CERN) ; Sinkovits, Theo (CERN) ; Taborelli, Mauro (CERN)
Electron cloud effects are one of the most critical aspects for the LHC and the future circular colliders. In the frame of the electron-positron collider FCC-ee, an estimation of the electron cloud build up in the machine will be discussed in this paper. [...]
IPAC-2018-MOPMK012.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-MOPMK012
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMK012
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Amorphous Carbon Thin Film Coating of the SPS Beamline: Evaluation of the First Coating Implementation
/ Van Gompel, Matthias (CERN) ; Chiggiato, Paolo (CERN) ; Costa Pinto, Pedro (CERN) ; Cruikshank, Paul (CERN) ; Pasquino, Chiara (CERN) ; Perez Espinos, Jaime (CERN) ; Sapountzis, Antonios (CERN) ; Taborelli, Mauro (CERN) ; Vollenberg, Wilhelmus (CERN)
As part of the LHC Injector Upgrade (LIU) project, the Super Proton Synchrotron (SPS) must be upgraded in order to inject in the LHC 25 ns bunch spaced beams of higher intensity. To mitigate the Electron Multipacting (EM) phenomenon in the SPS, CERN developed thin film carbon coatings with a low Secondary Electron Yield (SEY). [...]
CERN-ACC-2017-304.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-MOOCA3
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOOCA3
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Measurement of the Energy Distribution Function of Electrons Generated by Radio-frequency Induced Multipacting in a Beam Pipe
/ Van Gompel, Matthias (CERN) ; Caspers, Fritz (CERN) ; Costa Pinto, Pedro (CERN) ; Leber, Roland (CERN) ; Romano, Annalisa (CERN) ; Salemme, Roberto (CERN) ; Taborelli, Mauro (CERN)
The development of Electron Multipacting (EM) in high intensity particle accelerators depends, amongst others, on the Secondary Electron Yield (SEY) of surfaces facing the beam. In-situ studies of electron clouds in particle accelerators must cope with operation schedule and other technical constrains. [...]
CERN-ACC-2016-294.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-MOPOR026
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.MOPOR026
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