Dortmund 2021 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 3: Radiofrequency

AKBP 3.3: Vortrag

Dienstag, 16. März 2021, 14:30–14:45, AKBPb

Nb3Sn thin film synthesis for SRF application by co-sputtering — •Nils Schäfer, Nail Karabas, Márton Major, and Lambert Alff — Institute of Material Science, Technische Universität Darmstadt (Germany)

Nowadays Nb is commonly used for superconducting radio frequency (SRF) cavities. Nb3Sn is a promising thin film material for SRF cavities as it can empower the cavity to operate at higher acceleration fields and higher temperatures. This is also achievable by a higher quality factor since the surface resistivity is lower with respect to Nb-only cavities at radiofrequency. Several approaches could be used for deposition of Nb3Sn thin films (e.g. sputtering, evaporation, and CVD). The applicability to successfully coat cavities was demonstrated for several processes with their respective disadvantages. Nb3Sn is either synthesized by a deposition of Sn on the Nb cavity or a stoichiometric deposition of Nb and Sn. Film Thickness, and especially stoichiometry are essential for the high potential of the Nb3Sn material properties. A new Co-Sputtering process is used in the Advanced Thin Film Technology group to form high performance layers at unprecedented process temperatures. This process is able to overcome the detrimental diffusion of Sn at elevated temperatures.