Speaker
Katsiaryna Ilyina
(CERN)
Description
A solution to reduce the cost of superconducting radiofrequency cavities is represented by superconducting thin film coated copper substrates. This technology has shown its potential within LEP, LHC and HIE-ISOLDE machines. In all those machines the superconducting thin film was made of $Nb$. Among the most promising future coating materials $Nb_{3}Sn$ stands as one of the best candidates. Combined to the copper substrate it would offer important benefits with respect to the bulk $Nb$ cavities: significantly higher stability against quenching, due to the high thermal conductivity of copper and lower Bardeen-Cooper-Schrieffer (BCS) surface resistance $R_{BCS}$ and therefore higher quality factor $Q_{0}$, owing to the high critical temperature of $Nb_{3}Sn$ (~18.2K).
This work is devoted to the investigation of $Nb_{3}Sn$ thin films with the aim to produce low-loss surfaces. The synthesis of $Nb_{3}Sn$ coatings was carried out on copper substrates using DC magnetron sputtering. Three different post-coating annealing temperatures were applied in order to achieve a stable A15 phase. The influence of the deposition and annealing parameters on the grain formation and superconducting properties of the system were studied.
Author
Katsiaryna Ilyina
(CERN)
Co-authors
Alban Rene Maurice Sublet
(CERN)
David Richter
(CERN)
Floriane Leaux
(CERN)
Fritz Motschmann
(CERN)
Guillaume Jonathan Rosaz
(CERN)
Mauro Taborelli
(CERN)
Sergio Calatroni
(CERN)
Wilhelmus Vollenberg
(CERN)
Zuzanna Mydlarz
(Rzeszow Univ. Tech., Fac. Elec.Eng. (PL))
