Pira, C.; Azzolini, O.; Caforio, R.; Chyhyrynets, E.; Fonnesu, D.; Ford, D.; Garcia, v.; Keppel, G.; Marconato, G.; Salmaso, A.; Stivanello, F.; Bertucci, M.; Paparella, R.; Bonesso, M.; Candela, S.; Candela, V.; Dima, R.; Favero, G.; Pepato, A.; Rebesan, P.; Romanato, M.; Antoine, C. Z.; Berry, S; Kalboussi, Y.; Proslier, T.; Longuevergne, D.; Hryhorenko, O.; Seiler, E.; Ries, R.; Keckert, S.; Kugeler, O.; Knobloch, J.; Prucnal, S.; Zhou, S.; Jiang, X.; Staedler, T.; Berton, R.; Piccoli, D.; Piccoli, F.; Squizzato, G.; Telatin, F.; Piccoli, S. R. L.; Medvids, A.; Mychko, A.; Onufrievs, P.; Benjamin, C.; Malychev, O. B.; Sian, T.; Smith, L.; Valizadeh, R.; Burt, G.; Leicester, N.; Marks, S.; Seal, D.; Turner, D.; Bradley, J. W.; Simon, S.; Valente-Feliciano, A.-M.: Progress in European Thin Film Activities. In: Kenji Saito ... [Ed.] : SRF2023 : Proceedings of the 21st International Conference on RF Superconductivity, Grand Rapids, MichiganGeneve: JACoW, 2023. - ISBN 978-3-95450-234-9, p. WECAA01/1-8
https://srf2023.vrws.de/papers/wecaa01.pdf
https://srf2023.vrws.de/talks/wecaa01_talk.pdf
Open Access Version
Abstract:
Thin-film cavities with higher Tc superconductors (SC) than Nb promise to move the operating temperature from 2 to 4.5 K with savings 3 orders of magnitude in cryogenic power consumption. Several European labs are coordinating their efforts to obtain a first 1.3 GHz cavity prototype through the I.FAST collaboration and other informal col- laborations with CERN and DESY. R&D covers the entire production chain. In particular, new production techniques of seamless Copper and Niobium elliptical cavities via additive manufacturing are studied and evaluated. New acid-free polishing techniques to reduce surface roughness in a more sustainable way such as plasma electropolishing and metallographic polishing have been tested. Optimization of coating parameters of higher Tc SC than Nb (Nb 3Sn, V 3Si, NbTiN) via PVD and multilayer via ALD are on the way. Finally, rapid heat treatments such as Flash Lamp Annealing and Laser Annealing are used to avoid or reduce Copper diffusion in the SC film. The development and characterization of superconducting coatings is done on planar samples, 6 GHz cavities, choke cavities, QPR and 1.3 GHz cavities. This work presents the progress status of these co-ordinated efforts.