Dresden 2020 – wissenschaftliches Programm
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AKBP 10.5: Vortrag
Dienstag, 17. März 2020, 17:30–17:45, HSZ 301
Low temperature formation of high quality Nb3Sn thin films by co-sputtering for SRF cavities — •Nils Schäfer1, Nail Karabas1,2, Márton Major1, and Lambert Alff1 — 1Institute of Materials Science — 2Institut für Kernphysik
Nb3Sn is a promising thin film material for superconducting radiofrequency (SRF) cavities as it can empower the cavity to operate at higher acceleration fields and lower expenses for cooling in respect to current state of the art Nb-cavities. This is achievable by the superior material properties like critical temperature, superheating field and surface resistivity. Up to now, Nb3Sn coated Nb-cavities could not replace bulk Nb, mainly due to the huge difference in vapor-pressure of Nb and Sn which makes the thermal approach challenging. Co-sputtering is used to overcome this limitation by utilizing the larger kinetic energy of the sputtering process. In case of co-sputtering the kinetic energy of both elements is controlled separately to form Nb3Sn at substrate temperatures as low as 400∘C with TC up to 16.3 K, close to the bulk critical temperature. Work supported by the German Federal Ministry for Education and Research (BMBF) through grant 05H18RDRB2.