IPAC'24 - 15th International Particle Accelerator Conference

Niobium-tin films grown on copper by low-temperature co-sputtering for SRF cavity application

WEPS47

22 May 2024, 16:00

2h

Blues (MCC Exhibit Hall A)

Poster Presentation MC7.T07 Superconducting RF Wednesday Poster Session

Speaker

Marton Major (Technische Universitaet Darmstadt)

Description

In this contribution the low-temperature synthesis of Nb3Sn, a promising material for superconducting radio frequency (SRF) application is presented. Theoretically Nb3Sn is superior to Nb in surface resistivity, critical temperature and critical field, but in practice the performance is lacking behind due to early quenching at low fields. Co-sputtering at low sample temperature could overcome the microstructure-related limitations due to the high kinetic energy of the sputtered particles.
We show by X-ray photoelectron spectroscopy that copper diffusion during low-temperature growth is limited to an interface region of about 100 nm. Furthermore, we show that the deposition time has a critical influence on phase formation. The deposited Nb3Sn films have low surface roughness, high scratch resistance and they show excellent adhesion before and after thermal cycling.

Funding Agency

This work was supported by the German Federal Ministry of Education and Research through grant 05H21RDRB1 and the German Research Foundation via AccelencE research training Group (GRK2128).