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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 9: SRF-Cavities -Materials and Methods
AKBP 9.4: Vortrag
Mittwoch, 20. März 2024, 15:45–16:00, E 020
Physical properties of Nb3Sn films grown on copper by low-temperature co-sputtering for SRF cavity application — Nils Schäfer1, Carl Jung1, Matthias Mahr1, Christian Dietz1, Sebastian Bruns1, Michaela Arnold2, •Márton Major1, and Lambert Alff1 — 1Institute of Materials Science, Technical University of Darmstadt, Darmstadt, Germany — 2Institute of Nuclear Physics, Technical University of Darmstadt, Darmstadt, Germany
In this contribution we present the application relevant physical properties of Nb3Sn thin-film coatings deposited onto copper substrates by a recently developed low-temperature co-sputtering process. 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. Nb3Sn thin films grown at as low as 480 ∘C substrate temperature achieve a Tc of 16.8 K.
This work was supported by the German Federal Ministry of Education and Research (BMBF) through grant 05H21RDRB1 and the German Research Foundation (DFG) via AccelencE research training Group (GRK2128).
Keywords: superconductor; cavity; Nb3Sn; coating; copper