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1.
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Results of the R&D; RF Testing Campaign of 1.3 GHz Nb/Cu Cavities
/ Vega Cid, Lorena (CERN) ; Bellini, Gloria (CERN) ; Bianchi, Antonio (CERN) ; Ferreira, Leonel (CERN) ; Leith, Stewart (CERN) ; Pereira Carlos, Carlota (CERN) ; Rosaz, Guillaume (CERN) ; Venturini Delsolaro, Walter (CERN)
In the context of the R&D; program on Nb/Cu carried out at CERN, a total of 25 tests have been performed since 2021. This talk will present these results. [...]
2023 - 6 p.
- Published in : JACoW SRF 2023 (2023) 621-626
Fulltext: PDF;
In : 21st International Conference on Radio-Frequency Superconductivity (SRF 2023), Grand Rapids, MI, United States, 22 - 30 Jun 2023, pp.621-626
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2.
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Geometry Optimization for a Quadrupole Resonator at Jefferson Lab
/ Bira, Sarra (Jefferson Lab) ; Ge, Mingqi (Jefferson Lab) ; Valente-Feliciano, Anne-Marie (Jefferson Lab) ; Vega Cid, Lorena (CERN) ; Venturini Delsolaro, Walter (CERN)
The quadrupole resonator (QPR) is a sample characterization tool to measure the RF properties of superconducting materials using the calorimetry method at different temperatures, magnetic fields, and frequencies. Such resonators are currently operating at CERN and HZB but suffer from Lorentz force detuning and modes overlapping, resulting in higher uncertainties in surface resistance measurement. [...]
2023 - 4 p.
- Published in : JACoW SRF 2023 (2023) WEPWB048
Fulltext: PDF;
In : 21st International Conference on Radio-Frequency Superconductivity (SRF 2023), Grand Rapids, MI, United States, 22 - 30 Jun 2023, pp.WEPWB048
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3.
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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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4.
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Main Highlights of ARIES WP15 Collaboration
/ Malyshev, Oleg (Daresbury ; Cockcroft Inst. Accel. Sci. Tech.) ; Antoine, Claire (IRFU, Saclay) ; Azzolini, Oscar (INFN, Legnaro) ; Burt, Graeme (Cockcroft Inst. Accel. Sci. Tech. ; Lancaster U. (main)) ; Chyhyrynets, Eduard (INFN, Legnaro) ; Goudket, Philippe (Daresbury ; Cockcroft Inst. Accel. Sci. Tech.) ; Keppel, Giorgio (INFN, Legnaro) ; Kugeler, Oliver (Helmholtz-Zentrum, Berlin) ; Leith, Stewart (U. Siegen (main)) ; Medvids, Arturs (Riga Tech. U.) et al.
An international collaboration of research teams from CEA (France), CERN (Switzerland), INFN/LNL (Italy), HZB and USI (Germany), IEE (Slovakia), RTU (Latvia) and STFC/DL (UK), are working together on better understanding of how to improve the properties of superconducting thin films (ScTF) for RF cavities. The collaboration has been formed as WP15 in the H2020 ARIES project funded by EC. [...]
2022 - 5 p.
- Published in : JACoW SRF 2021 (2022) 571-575
Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.571-575
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5.
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Synthesis of Nb and Alternative Superconducting Film to Nb for SRF Cavity as Single Layer
/ Valizadeh, Reza (Daresbury ; Cockcroft Inst. Accel. Sci. Tech.) ; Antoine, Claire (IRFU, Saclay) ; Chyhyrynets, Eduard (INFN, Legnaro) ; Goudket, Philippe (Daresbury ; Cockcroft Inst. Accel. Sci. Tech.) ; Hannah, Adrian (Daresbury ; Cockcroft Inst. Accel. Sci. Tech.) ; Kugeler, Oliver (Helmholtz-Zentrum, Berlin) ; Leith, Stewart (U. Siegen (main)) ; Malyshev, Oleg (Daresbury ; Cockcroft Inst. Accel. Sci. Tech.) ; Medvids, Arturs (Riga Tech. U.) ; Onufrijevs, Pavels (Riga Tech. U.) et al.
The production of superconducting coatings for radio frequency (RF) cavities has been developed over several decades. It is widely accepted that for any further improvement in cavity RF performance, innovation is needed and one may have to turn to other forms of Nb and other superconducting materials. [...]
2022 - 6 p.
- Published in : JACoW SRF 2021 (2022) 893-898
Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.893-898
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6.
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7.
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Thermal Mapping of SRF Cavities by Second Sound Detection With Transition Edge Sensors and Oscillating Superleak Transducers
/ Vandoni, Giovanna (CERN) ; Furci, Hernan (Ecole Polytechnique, Lausanne) ; Koettig, Torsten (CERN) ; Macpherson, Alick (CERN) ; Turaj, Katarzyna (CERN) ; Vega Cid, Lorena (CERN)
The SRF cavity testing facilities at CERN include four vertical cryostat stations in SM18 and a cryostat for small cavities in the Cryolab. A large range of structures are tested, from Nb thin film cavities for HIE-Isolde and LHC, to bulk Nb crab cavities for HiLumi or 704 MHz 5-cell high-gradient cavities. [...]
SRF2019.-
2019 - 5 p.
- Published in : (2019) , pp. 1184-1188
Fulltext: PDF;
In : 19th International Conference on RF Superconductivity, Dresden, Germany, 30 Jun - 05 Jul 2019, pp.1184-1188
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8.
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Studies towards the new beam screen system of the LHC injection kicker magnet for HL-LHC operation
/ Vlachodimitropoulos, Vasileios (CERN) ; Barnes, Michael (CERN) ; Chmielinska, Agnieszka (Ecole Polytechnique, Lausanne ; CERN) ; Ducimetière, Laurent (CERN) ; Vega Cid, Lorena (CERN ; Madrid, Polytechnic U.) ; Weterings, Wim (CERN)
Although no heating issues were observed in the Large Hadron Collider’s (LHC) injection kicker magnets (MKIs) during Run 2, simulations suggest that for operation with the high intensity beams of the High Luminosity LHC (HL-LHC) project, the magnet’s ferrite yokes will reach their Curie temperature, thus leading to long turnaround times before a new beam can be safely injected into the machine. To safely enter the HL-LHC era, a campaign to redesign the kicker’s beam screen was launched. [...]
CERN-ACC-2019-247.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-THPRB074
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPRB074
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9.
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Operational experience of a prototype LHC injection kicker magnet with a low SEY coating and redistributed power deposition
/ Barnes, Michael (CERN) ; Bracco, Chiara (CERN) ; Bregliozzi, Giuseppe (CERN) ; Chmielinska, Agnieszka (Ecole Polytechnique, Lausanne ; CERN) ; Ducimetière, Laurent (CERN) ; Goddard, Brennan (CERN) ; Iadarola, Giovanni (CERN) ; Kramer, Thomas (CERN) ; Vega Cid, Lorena (Madrid, Polytechnic U. ; CERN) ; Vlachodimitropoulos, Vasileios (CERN) et al.
In the event that it is necessary to exchange an LHC injection kicker magnet (MKI), the newly installed kicker magnet would limit operation for a few hundred hours due to dynamic vacuum. A surface coating with a low secondary electron yield, applied to the inner surface of an alumina tube to reduce dynamic vacuum activity without increasing the probability of Unidentified Falling Objects, and which is compatible with the high voltage environment, was included in an upgraded MKI installed in the LHC during the 2017-18 Year End Technical Stop. [...]
CERN-ACC-2019-249.-
2019 - 7 p.
- Published in : (2019) , pp. THPRB072
- Published in : J. Phys.: Conf. Ser. 1350 (2019) 012145
Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPRB072
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10.
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An Upgraded LHC Injection Kicker Magnet
/ Barnes, Michael (CERN) ; Bracco, Chiara (CERN) ; Bregliozzi, Giuseppe (CERN) ; Chmielinska, Agnieszka (CERN) ; Ducimetière, Laurent (CERN) ; Goddard, Brennan (CERN) ; Kramer, Thomas (CERN) ; Neupert, Holger (CERN) ; Vega Cid, Lorena (CERN) ; Vlachodimitropoulos, Vasileios (CERN) et al.
An upgrade of the LHC injection kickers is necessary for HL-LHC to avoid excessive beam induced heating of these magnets: the intensity of the HL-LHC beam will be twice that of LHC. In addition, in the event that it is necessary to exchange an injection kicker magnet, the newly installed kicker magnet would limit HL-LHC operation for a few hundred hours due to dynamic vacuum activity. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-WEPMK003
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPMK003
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