8-10 October 2018
INFN - Laboratori Nazionali di Legnaro
Europe/Rome timezone

Cryogenic RF performances of Nb3Sn films on Copper

9 Oct 2018, 13:10
25m
Villi Room (INFN - Laboratori Nazionali di Legnaro)

Villi Room

INFN - Laboratori Nazionali di Legnaro

Viale dell'Università 2, Legnaro (Padova) - Italy
Other superconducting materials beyond niobium Other SC Materials beyond Niobium: Nb3Sn

Speaker

Dr Marco Arzeo (CERN)

Description

Superconducting radio frequency (SRF) cavities, made of niobium films on copper (Nb/Cu), are currently employed for a large variety of particle accelerators. At the same time, the Nb/Cu technology, being very cost effective, also represents one of the main options for upcoming machines like the future circular collider (FCC). While research and development continue on the Nb/Cu technology, there is still a performance gap with respect to the best results that can be obtained with bulk Nb. Alternative superconducting materials, with larger critical temperature Tc and superheating field Hsh, might pave the way towards higher performance. In this respect, materials in the A15 family, like Nb3Sn, are among the most promising. At CERN, a reliable coating procedure for Nb3Sn films on copper, using niobium or tantalum as intermediate layer, has been developed. The films are reproducible and show excellent DC transport properties (Tc up to 17 K), morphological and structural characteristics. A comprehensive RF characterization of these films was still missing though. In this work, we report the results of a Nb3Sn film coated on a copper sample, measured in the CERN quadrupole resonator (QPR). The QPR enables the characterization of small samples at different temperatures, RF frequencies and field values. The main results are compared with those from Nb bulk and Nb/Cu samples, measured with the same technique.

Primary author

Dr Marco Arzeo (CERN)

Co-authors

Presentation Materials

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