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1.
Direct Measurement of Microwave Loss in Nb Films for Superconducting Qubits / Abdisatarov, B. (Fermilab ; Jefferson Lab ; Old Dominion U.) ; Bafia, D. (Fermilab) ; Murthy, A. (Fermilab) ; Eremeev, G. (Fermilab) ; Elsayed-Ali, H.E. (Jefferson Lab ; Old Dominion U.) ; Lee, J. (Fermilab) ; Netepenko, A. (Fermilab) ; Carlos, C.P. A. (CERN) ; Leith, S. (CERN) ; Rosaz, G.J. (CERN) et al.
Niobium films are a key component in modern two-dimensional superconducting qubits, yet their contribution to the total qubit decay rate is not fully understood. The presence of different layers of materials and interfaces makes it difficult to identify the dominant loss channels in present two-dimensional qubit designs. [...]
arXiv:2407.08856; FERMILAB-PUB-24-0374-SQMS.- 2024-09-16 - 20 p. - Published in : Appl. Phys. Lett. 125 (2024) 124002 Fulltext: 2407.08856 - PDF; 968bae4e0dff6c77e26a68caebca446d - PDF; External link: Fermilab Library Server
2.
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;
3.
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;
4.
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;
5.
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;

似た著者名:
1 Carlos, C H
1 Carlos, C.P. A.
2 Carlos, Carlota P A
1 Carlos, Carlota P.A.
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