CERN Accelerating science

CERN Document Server Sök i 2,042 journaler efter:  1 - 10nästaslut  gå till journal: Sökningen tog 0.22 sekunder. 
1.
CERN Based Tc Measurement Station for Thin-Film Coated Copper Samples and Results on Related Studies / Fonnesu, Dorothea (CERN ; Siegen U.) ; Bremer, Johan (CERN) ; Koettig, Torsten (CERN) ; Laín-Amador, Lucia (CERN) ; Pereira Carlos, Carlota (CERN) ; Rosaz, Guillaume (CERN) ; Vaaranta, Antti (Helsinki U.)
In the framework of the Future Circular Collider (FCC) Study, the development of thin-film coated superconducting radio-frequency (SRF) cavities capable of providing higher accelerating fields (10 to 20 MV/m against 5 MV/m of LHC) represents a major challenge. The development of a test stand commissioned at CERN for the inductive measurement of the critical temperature (Tcc) of SC thin-film deposited on copper samples for SRF application is presented in this work. [...]
2022 - 4 p. - Published in : JACoW SRF 2021 (2022) 105-108 Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.105-108
2.
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
3.
Reverse coating technique for the production of Nb thin films on copper for superconducting radio-frequency applications / Fonnesu, D (CERN) ; Baris, A (CERN) ; Calatroni, S (CERN) ; Lain Amador, L (CERN) ; Pfeiffer, S (CERN) ; Rosaz, G (CERN) ; Bonura, M (U. Geneva (main)) ; Senatore, C (U. Geneva (main))
In the framework of the Future Circular Collider Study, the development of thin-film coated superconducting radio-frequency copper cavities capable of providing higher accelerating fields (10–20 MV m1 against 5 MV m1 for the Large Hadron Collider) represents a major challenge. The method investigated here for the production of seamless niobium-coated copper cavities is based on the electroforming of the copper structure around a sacrificial aluminium mandrel that is pre-coated with a niobium thin film. [...]
2022 - 11 p. - Published in : Supercond. Sci. Technol. 35 (2022) 125003 Fulltext: PDF;
4.
Improved film density for coatings at grazing angle of incidence in high power impulse magnetron sputtering with positive pulse / Avino, F (CERN) ; Fonnesu, D (CERN) ; Koettig, T (CERN) ; Bonura, M (Geneva U.) ; Senatore, C (Geneva U.) ; Perez Fontenla, A T (CERN) ; Sublet, A (CERN) ; Taborelli, M (CERN)
The production of a dense and void-free thin film on large and complex substrates is still a challenge in Physical Vapor Deposition. High Power Impulse Magnetron Sputtering (HiPIMS) with voltage inversion (positive pulse) after the main negative pulse is an attractive alternative to a negatively biased substrate to improve the film properties. [...]
2020 - 9 p. - Published in : Thin Solid Films 706 (2020) 138058 Fulltext from Publisher: PDF;
5.
Thick Film Morphology and SC Characterizations of 6 GHz Nb/Cu Cavities / Garcia Diaz, Vanessa (INFN, Legnaro ; U. Ferrara (main)) ; Azzolini, Oscar (INFN, Legnaro) ; Chyhyrynets, Eduard (INFN, Legnaro) ; Fonnesu, Dorothea (CERN) ; Keppel, Giorgio (INFN, Legnaro) ; Kugeler, Oliver (Helmholtz-Zentrum, Berlin) ; Pira, Cristian (INFN, Legnaro) ; Stivanello, Fabrizio (INFN, Legnaro) ; Tikhonov, Dmitry (Helmholtz-Zentrum, Berlin) ; Valizadeh, Reza (Daresbury) et al.
Thick films deposited in long pulse DCMS mode onto 6 GHz copper cavities have demonstrated the mitigation of the Q-slope at low accelerating fields. The Nb thick films (~40 microns) show the possibility to reproduce the bulk niobium superconducting properties and morpholo-gy characterizations exhibited dense and void-free films that are encouraging for the scaling of the process to 1.3 GHz cavities. [...]
2022 - 5 p. - Published in : JACoW SRF 2021 (2022) 18-22 Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.18-22
6.
Nb Coated HIE-ISOLDE QWR Superconducting Accelerating Cavities: From Process Development to Series Production / Sublet, Alban (CERN) ; Aviles Santillana, Ignacio (CERN) ; Bartova, Barbora (CERN) ; Calatroni, Sergio (CERN) ; Jecklin, Noemie (CERN) ; Mondino, Irene (CERN) ; Therasse, Mathieu (CERN) ; Venturini Delsolaro, Walter (CERN) ; Zhang, Pei (CERN) ; Cantoni, Marco (Ecole Polytechnique, Lausanne)
The new HIE-ISOLDE accelerator at CERN requires the production of 32 superconducting cavities (20 high- β and 12 low- β ) in order to increase the energy of the rare isotope beam delivered to the experiments. The Quarter Wave Resonators (QWR) cavities (0.3m diameter and 0.9m height for the high- β ) are made of OFE 3D-forged copper and are coated by DC-bias diode sputtering with a thin superconducting layer of niobium. [...]
2014 - 3 p. - Published in : , pp. WEPRI042 Fulltext: PDF; External link: Published version from JACoW
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.WEPRI042
7.
Electrodeposition of copper applied to the manufacture of seamless superconducting rf cavities / Amador, L Lain (CERN) ; Chiggiato, P (CERN) ; Ferreira, L M A (CERN) ; Garcia-Tabares, E (CERN) ; Koettig, T (CERN) ; Meyer, M S (CERN) ; Perez-Fontenla, A T (CERN) ; Puthran, K (CERN) ; Rosaz, G (CERN) ; Taborelli, M (CERN)
Niobium thin film coated copper superconducting radio frequency elliptical cavities have demonstrated for many years their strong potential as an alternative to bulk niobium cavities. The thin film lower performance at high rf field is often attributed to the defects observed in the elaborated Nb layer, sometimes originated from defects inherited from the substrate itself. [...]
2021 - 11 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 082002 Fulltext: PDF;
8.
Development and characterisation of advanced coatings for high energy physics applications / Perez Fontenla, Ana Teresa (CERN) ; Pereira Carlos, Carlota (CERN) ; Leith, Stewart (CERN) ; Moros, Alice (CERN) ; Pfeiffer, Stephan (CERN) ; Rodriguez-Castro, Enrique (CERN) ; Rosaz, Guillaume (CERN)
The Future Circular Collider (FCC) study develops the technologies for next generation high performance particle colliders and accelerating structures. It places high requirements on the performance of Superconducting Radio Frequency (SRF) cavities used to accelerate the particle beam. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPA150 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPA150
9.
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
10.
Development of a TE011 Cavity for Thin-Films Study   / Martinet, G (IPN, Orsay) ; Blivet, S (IPN, Orsay) ; Fouaidy, M (IPN, Orsay) ; Hammoudi, N (IPN, Orsay)
WP: 10: SC RF technology for higher intensity proton accelerators and higher energy electron linacs
Task: 10.4: Thin Films

Bulk niobium cavities have almost reached their maximum performances. [...]
EuCARD-CON-2010-002.
- 2010.
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