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Surface Polishing Facility for Superconducting RF Cavities at CERN
/ Ferreira, Leonel (CERN) ; Chritin, Nicolas (CERN) ; Ferreira, Rodrigo (CERN) ; Gerbet, Valentin (CERN)
A new SRF cavity polishing facility which covers the needs for present projects like the HL-LHC and its CRAB cavities as well as ongoing and future activities in the frame of the FCC study was commissioned at CERN in 2019. This facility can handle chemical and electrochemical polishing baths, can process both niobium and copper-based cavities on a wide range of geometries, starting at 400 MHz up to 1.3 GHz for elliptical type of cavities and more complex shapes as defined by the DQW and RFD CRAB design. [...]
2022 - 5 p.
- Published in : JACoW SRF 2021 (2022) 387-391
Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.387-391
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Design of a compact superconducting crab-cavity for LHC using Nb-on-Cu-coating technique
/ Grudiev, Alexej (CERN) ; Atieh, Said (CERN) ; Calaga, Rama (CERN) ; Calatroni, Sergio (CERN) ; Capatina, Ofelia (CERN) ; Carra, Federico (CERN) ; Favre, Gilles (CERN) ; Ferreira, Leonel (CERN) ; Poncet, Jean-Francois (CERN) ; Richard, Thibaut (CERN) et al.
The design of a compact superconducting crab-cavity for LHC using Nb-on-Cu-coating technique is presented. The cavity shape is based on the ridged waveguide resonator with wide open apertures to provide access to the inner surface of the cavity for coating. [...]
2015 - 5 p.
- Published in : 10.18429/JACoW-SRF2015-THPB048
Fulltext: PDF;
In : 17th International Conference on RF Superconductivity, Whistler, Canada, 13 - 18 Sep 2015, pp.THPB048
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RF Dipole Crab Cavity Testing for HL-LHC
/ Valverde Alonso, Nuria (CERN) ; Calaga, Rama (CERN) ; Calvo, Sebastien (CERN) ; Capatina, Ofelia (CERN) ; Castilla, Alejandro (CERN ; Lancaster U. (main)) ; Chiodini, Marco (CERN) ; Duval, Christophe (CERN) ; Ferreira, Leonel (CERN) ; Gourragne, Max (CERN) ; Kohler, Paul (CERN) et al.
RF Crab Cavities are an essential element of the High Luminosity LHC (HL-LHC) upgrade at CERN. Two RF dipole crab cavity used for the compensation of the horizontal crossing angle were recently manufactured and integrated into Titanium Helium tank and RF ancillaries necessary for the beam operation. [...]
2022 - 7 p.
- Published in : JACoW SRF 2021 (2022) 687-693
Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.687-693
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RF Performance Results of RF Double Quarter Wave Resonators for LHC High Luminosity Project
/ Turaj, Katarzyna (CERN) ; Bastard, Jeremy (CERN) ; Calaga, Rama (CERN) ; Calvo, Sebastien (CERN) ; Capatina, Ofelia (CERN) ; Castilla, Alejandro (CERN ; Jefferson Lab) ; Chiodini, Marco (CERN) ; Duval, Christophe (CERN) ; Edwards, Amelia (CERN ; Lancaster U.) ; Ferreira, Leonel (CERN) et al.
The LHC High Luminosity (HL-LHC) project includes, among other key items, the installation of superconducting crab cavities in the LHC machine. The Double Quarter Wave (DQW) crab cavity will be utilised to compensate for the effects of the vertical crossing angle [...]
2023 - 7 p.
- Published in : JACoW SRF 2023 (2023) 925-928
Fulltext: PDF;
In : 21st International Conference on Radio-Frequency Superconductivity (SRF 2023), Grand Rapids, MI, United States, 22 - 30 Jun 2023, pp.925-928
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The Linac4 vacuum control system
/ Blanchard, Sebastien (CERN) ; De La Gama, Jose (CERN) ; Ferreira, Rodrigo (CERN) ; Gomes, Paulo (CERN) ; Gutierrez, Abel (CERN) ; Kopylov, Leonid (Serpukhov, IHEP) ; Mikheev, Mikhail (Serpukhov, IHEP) ; Pigny, Gregory (CERN) ; Rocha, Andre (CERN)
Linac4 is 160 MeV H⁻ linear accelerator replacing Linac2 as the first injector to the CERN accelerator complex, which culminates with the Large Hadron Collider. This new Linac will increase the beam brightness by a factor of two. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-ICALEPCS2017-THPHA056
Fulltext: PDF;
In : International Conference on Accelerator and Large Experimental Physics Control Systems, Barcelona, Spain, 8 - 13 Oct 2017, pp.THPHA056
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Integration of Wireless Mobile Equipment in Supervisory Application
/ Blanchard, Sebastien (CERN) ; Ferreira, Rodrigo (CERN) ; Gomes, Paulo (CERN) ; Pigny, Gregory (CERN) ; Rocha, Andre (CERN)
Pumping group stations and bake-out control cabinets are temporarily installed close to vacuum systems in CERN accelerator tunnels, during their commissioning. The quality of the beam vacuum during operation depends greatly on the quality of the commissioning. [...]
2020 - 5 p.
- Published in : 10.18429/JACoW-ICALEPCS2019-WEPHA017
Fulltext: PDF;
In : 17th Biennial International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS), New York, United States, 5 - 11 Oct 2019, pp.WEPHA017
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LTE/3G-based wireless communications for remote control and monitoring of PLC-controlled mobile vacuum devices
/ Ferreira, Rodrigo (CERN) ; Blanchard, Sebastien (CERN) ; Fernandes, Telmo (Leiria, IPL) ; Gomes, Paulo (CERN) ; Pigny, Gregory (CERN)
All particle accelerators and most experiments at CERN require high (HV) or ultra-high (UHV) vacuum levels. Contributing to vacuum production are two types of mobile devices: Turbo-Molecular Pumping Groups and Bakeout Racks. [...]
2018 - 7 p.
- Published in : 10.18429/JACoW-ICALEPCS2017-MOCPL04
Fulltext: PDF;
In : International Conference on Accelerator and Large Experimental Physics Control Systems, Barcelona, Spain, 8 - 13 Oct 2017, pp.MOCPL04
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Seamless 1.3 GHz Copper Cavities for Nb Coatings: Cold Test Results of Two Different Approaches
/ Vega Cid, Lorena (CERN) ; Atieh, Said (CERN) ; Ferreira, Leonel (CERN) ; Laín-Amador, Lucia (CERN) ; Leith, Stewart (CERN) ; Pereira Carlos, Carlota (CERN) ; Rosaz, Guillaume (CERN) ; Scibor, Karol (CERN) ; Venturini Delsolaro, Walter (CERN) ; Vidal García, Pablo (CERN ; Madrid, CIEMAT)
A necessary condition for high SRF performances in thin film coated cavities is the absence of substrate defects. For instance, in the past, defects originated around electron beam welds in high magnetic field areas have been shown to be the cause of performance limitations in Nb/Cu cavities. [...]
2022 - 5 p.
- Published in : JACoW SRF 2021 (2022) 498-502
Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.498-502
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Consolidations on the Vacuum Controls of the CERN Accelerators, During the First Long Shutdown of the LHC
/ Gomes, Paulo (CERN) ; Antoniotti, Fabien (CERN) ; Aragon, Fernando (CERN) ; Bellorini, François (CERN) ; Blanchard, Sebastien (CERN) ; Boivin, Jean-Pierre (CERN) ; Chatzigeorgiou, Nikolaos (CERN) ; Daligault, Frederic (CERN) ; Ferreira, Rodrigo (CERN) ; Fraga, Jorge (CERN) et al.
For two years (Spring 2013 - Spring 2015), the LHC went through its first long shutdown (LS1). It was mainly motivated by the consolidation of magnet interconnects, to allow operation with 6.5 TeV proton beams. [...]
2015 - 4 p.
- Published in : 10.18429/JACoW-ICALEPCS2015-MOPGF104
Fulltext: PDF; External link: JACoW
In : 15th International Conference on Accelerator and Large Experimental Physics Control Systems, Melbourne, Australia, 17 - 23 Oct 2015, pp.MOPGF104
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