Keyword: framework
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SUPTEV003 Cu/Nb QPR Surface Preparation Protocol in the Framework of ARIES Project SRF, superconductivity, cavity, ECR 121
 
  • E. Chyhyrynets, O. Azzolini, R. Caforio, V.A. Garcia Diaz, G. Keppel, C. Pira, F. Stivanello
    INFN/LNL, Legnaro (PD), Italy
 
  Funding: Work supported by the INFN CSNV experiment TEFEN. This project has received funding from the European Union’s Horizon 2020 Research and Innovation Pro-gramme under Grant Agreement no. 730871.
The Quadrupole Resonator is a powerful tool for SRF R&D on thin films. It allows to perform Q vs E measurements on flat sample rather than a curved surface of a cavity. For the investigation of SC coatings on copper substrates, e-beam welded Cu/Nb samples have been prepared for the QPR. However, the presence of two metals, in particular at the interface makes proper polishing of both surfaces challenging due the different chemical behaviour of both components. In this work we present the protocol developed for surface preparation of the coexisting Cu and Nb phases and the results obtained for 5 different samples. The work was performed in the framework of the ARIES project.
 
poster icon Poster SUPTEV003 [2.506 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2021-SUPTEV003  
About • Received ※ 21 June 2021 — Revised ※ 08 July 2021 — Accepted ※ 12 August 2021 — Issue date ※ 27 September 2021
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TUPFDV007 Surface Impedance of Nb3Sn and YBa2Cu3O7-δ in High Magnetic Fields impedance, cavity, radio-frequency, electron 416
 
  • N. Pompeo, A. Alimenti, E. Silva, K. Torokhtii
    Università degli Studi Roma III, Roma, Italy
  • G. Celentano, V. Pinto, F. Rizzo
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • R. Flükiger
    UNIGE, Geneva, Switzerland
  • T. Spina
    Fermilab, Batavia, Illinois, USA
 
  Funding: This work has been partially carried out within the framework of the EUROfusion consortium, funding from the Euratom research and training programme 2014-18 and 2019-20 under grant agreement No 633053
New potential rf applications of superconductors emerged with the need to operate in high dc magnetic fields (up to 16 T) where vortex motion dictates the response: the beam screen coating of the Future Circular Collider (FCC) [1] and haloscopes, i.e. rf cavities for the axions detection [2]. However, very few data are available in the required regimes. We present in this work measurements of the surface impedance Z up to 12 T on bulk Nb3Sn and YBCO thin films grown by different techniques. The measurements are performed with a dielectric loaded resonator operating at 15 GHz. We obtained the vortex motion resistivity and extracted the high frequency vortex motion parameters [3]: the depinning frequency, the flux-flow resistivity and the pinning constant, as well as their temperature and field dependences. Substantial differences are highlighted in the high frequency pinning properties of the studied materials, providing useful information on possible improvements in view of applications. A comparison with the results obtained in the microwave frequency range at lower fields (up to 1 T) is given.
[1] S. Calatroni, IEEE Trans. Appl. Supercond., vol. 26 p. 3500204, 2016.
[2] D. Alesini et al., Phys. Rev. D, vol. 99, p. 101101, 2019.
[3] J.I. Gittleman and B. Rosenblum, Phys. Rev. Lett., vol. 16, p.734, 1966.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2021-TUPFDV007  
About • Received ※ 21 June 2021 — Accepted ※ 21 August 2021 — Issue date; ※ 02 January 2022  
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)