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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 10: New Accelerator Concepts and Miscellaneous (superconducting materials)

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 Karabas^1,2, 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.