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CERN Document Server 2,044 records found  1 - 10próximoend  jump to record: Search took 0.36 seconds. 
1.
(100)
Planar deposition of Nb thin films by HiPIMS for superconducting radiofrequency applications / Carlos, Carlota P A (CERN ; U. Geneva (main)) ; Leith, Stewart (CERN) ; Rosaz, Guillaume (CERN) ; Pfeiffer, Stephan (CERN) ; Senatore, Carmine (U. Geneva (main))
Cost efficiency and sustainability are critical challenges for future accelerator machines. Nb-coated Cu (Nb/Cu) superconducting radiofrequency (SRF) accelerating cavities, while requiring R&D; to meet high acceleration gradient performance standards, show potential for addressing these challenges. [...]
2024 - 12 p. - Published in : Vacuum 227 (2024) 113354 Fulltext: PDF;
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2.
(91)
Microscopic examination of rf-cavity-quality niobium films through local nonlinear microwave response / Wang, Chung-Yang (Maryland U.) ; Pereira, Carlota (CERN) ; Leith, Stewart (CERN) ; Rosaz, Guillaume (CERN) ; Anlage, Steven M. (Maryland U.)
The performance of superconducting radio-frequency (SRF) cavities is sometimes limited by local defects. To investigate the RF properties of these local defects, especially those that nucleate RF magnetic vortices, a near-field magnetic microwave microscope is employed. [...]
arXiv:2305.07746.- 2024-11-01 - 22 p. - Published in : Phys. Rev. Applied 22 (2024) 054010 Fulltext: 2305.07746 - PDF; Publication - PDF;
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3.
(91)
HiPIMS deposition of superconducting Nb thin films onto Cu substrates / Leith, S (Siegen U. ; CERN) ; Qiao, J (Siegen U.) ; Vogel, M (Siegen U.) ; Seiler, E (Kosice, IEF) ; Ries, R (Kosice, IEF) ; Li, Y (Siegen U.) ; Wiktor, C (Siegen U.) ; Mueller, J (Siegen U.) ; Sakalli, Y (Siegen U.) ; Butz, B (Siegen U.) et al.
The use of energetic condensation techniques, such as HiPIMS, has the potential to significantly improve the superconducting performance of coated Cu cavities by producing bulk-like Nb thin films. However, in order to benefit from these techniques, a deeper understanding of the effects of, and the relationship between, the different deposition parameters, the physical properties of the deposited films and the superconducting performance of the films, is still required. [...]
2023 - 14 p. - Published in : Vacuum 212 (2023) 112041 Fulltext: PDF;
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4.
(91)
Enhanced radio-frequency performance of niobium films on copper substrates deposited by high power impulse magnetron sputtering / Arzeo, M (CERN) ; Avino, F (CERN ; Ecole Polytechnique, Lausanne) ; Pfeiffer, S (CERN) ; Rosaz, G (CERN) ; Taborelli, M (CERN) ; Vega-Cid, L (CERN) ; Venturini-Delsolaro, W (CERN)
We present a study of radio frequency properties of niobium films deposited on copper by two different approaches based on High Power Impulse Magnetron Sputtering, namely with a DC voltage biased substrate and with bipolar target voltage. Such approaches enable the synthesis of dense superconducting (SC) layers. [...]
2022 - 9 p. - Published in : Supercond. Sci. Technol. 35 (2022) 054008 Fulltext: PDF;
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5.
(83)
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;
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6.
(67)
Surface Study of Nb/Cu Films for Cavity Deposition by ECR Plasma / Wu, Andy T ; Ike, Robert C ; Phillips, Larry ; Valente, Anne-Marie ; Wang, Haipeng ; Wu, Genfa
2005 - 3 p. External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.4153
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7.
(62)
Niobium thin film thickness profile tailoring on complex shape substrates using unbalanced biased High Power Impulse Magnetron Sputtering / Rosaz, Guillaume (CERN) ; Bartkowska, Aleksandra (CERN ; Madrid, Autonoma U.) ; Carlos, Carlota P A (CERN) ; Richard, Thibaut (CERN) ; Taborelli, Mauro (CERN)
The authors report in this paper the possibility to control the thickness profile of a thin film deposited by High Power Impulse Magnetron Sputtering (HiPIMS). It is shown that the combination between a HiPIMS discharge, an unbalanced magnetic configuration and the application of a negative bias onto the surface to coat enables tailoring on demand the coating thickness profile. [...]
2022 - 12 p. - Published in : Surf. Coat. Technol. 436 (2022) 128306 Fulltext: PDF;
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8.
(58)
Thickness effect on superconducting properties of niobium films for radio-frequency cavity applications / Bianchi, Antonio (INFN, Milan) ; Bonura, Marco (U. Geneva (main)) ; Carlos, Carlota P.A. (U. Geneva (main) ; CERN) ; Leith, Stewart (CERN) ; Rosaz, Guillaume (CERN) ; Senatore, Carmine (U. Geneva (main)) ; Venturini Delsolaro, Walter (CERN)
Niobium-coated copper radio-frequency cavities are cost-effective alternatives to bulk niobium cavities, given the lower material costs of copper substrates and their operation in liquid helium at around 4.2 K. However, these cavities historically exhibited a gradual degradation in performance with the accelerating field. [...]
arXiv:2403.11245.- 2024-06-27 - 10 p. - Published in : Supercond. Sci. Technol. 37 (2024) 085005 Fulltext: 2403.11245 - PDF; Publication - PDF;
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9.
(55)
Growth of Nb films on Cu for superconducting radio frequency cavities by direct current and high power impulse magnetron sputtering: A molecular dynamics and experimental study / Ghaemi, M (Helsinki Inst. of Phys.) ; Lopez-Cazalilla, A (Helsinki Inst. of Phys.) ; Sarakinos, K (Helsinki U. ; Royal Inst. Tech., Stockholm) ; Rosaz, G J (CERN) ; Carlos, C P A (CERN) ; Leith, S (CERN) ; Calatroni, S (CERN) ; Himmerlich, M (CERN) ; Djurabekova, F (Helsinki Inst. of Phys.)
The use of superconducting radio frequency (rf) cavities in particle accelerators necessitates that copper (Cu) surfaces are coated by thin niobium (Nb) films, predominantly synthesized by magnetron sputtering. A key feature of the rf cavities is that they exhibit a complex three-dimensional geometry, such that during Nb film growth vapor is not deposited on a flat substrate [...]
2024 - 11 p. - Published in : Surf. Coat. Technol. 476 (2024) 130199 Fulltext: PDF;
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10.
(54)
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
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