SRF2021 - List of Authors (Flükiger, R.)

Paper	Title	Page
TUPFDV007	Surface Impedance of Nb₃Sn and YBa₂Cu₃O_7-δ in High Magnetic Fields	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 ※ doi: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)

Paper

Title

Page

Surface Impedance of Nb₃Sn and YBa₂Cu₃O_7-δ in High Magnetic Fields

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 ※ doi: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)