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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
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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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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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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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7.
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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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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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9.
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Investigating the Superconducting Properties and Surface Morphology of Sputtered Nb Films on Cu Due to Laser Treatment
/ Turner, Daniel Andrew (Lancaster U.) ; Malyshev, O B (Cockcroft Inst. Accel. Sci. Tech.) ; Burt, G (Lancaster U.) ; Seiler, E (Bratislava, Inst. Phys.) ; Ries, R (Bratislava, Inst. Phys.) ; Medvids, A (Riga Tech. U.) ; Onufrijevs, P (Riga Tech. U.) ; Valizadeh, R (Cockcroft Inst. Accel. Sci. Tech.) ; Sublet, A (CERN) ; Pira, C (INFN, Legnaro) et al.
Bulk niobium is currently the material of choice for superconducting radio frequency (SRF) cavities and is a well matured process. However, it is possible that SRF cavities could be further improved beyond bulk Nb by sputtering thin Nb films onto Cu cavities. [...]
2023 - 12 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 1-12
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Progress and R/D challenges for FCC-ee SRF
/ Venturini Delsolaro, W (CERN) ; Garlasche, M (CERN) ; Peauger, F (CERN) ; Rosaz, G (CERN) ; Karpov, I (CERN) ; Zhang, L (Beijing, Inst. High Energy Phys.) ; Valente Feliciano, A M (Jefferson Lab) ; Udongwo, S A (Rostock U.) ; Bianchi, A (CERN) ; Bellini, G (CERN) et al.
The FCC-ee machines present a huge challenge for the RF systems, which need to be adapted to very diverse beam conditions going from moderate energy and high current for the Z machine to high energy and low beam current for the ttbar. This inverse scaling results naturally from a fixed budget for the synchrotron radiation, which the SRF cavities need to compensate. [...]
2023 - 13 p.
- Published in : EPJ Tech. Instrum. 10 (2023) 6
Fulltext: PDF;
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