Mainz 2022 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 8: Radiofrequency Systems 2 – Superconductivity
AKBP 8.4: Talk
Tuesday, March 29, 2022, 16:45–17:00, AKBP-H14
Nb3Sn thin film synthesis for SRF application by co-sputtering — •Nils Schäfer1, Damian Günzing2, Nail Karabas1, Alexey Arzumanov1, Deborah Motta-Meira3, Katharina Ollefs2, Márton Major1, Heiko Wende2, and Lambert Alff1 — 1Institute of Materials Science, Advanced Thin Film Technology, Technische Universität Darmstadt, Alarich-Weiss-Str. 2, 64287 Darmstadt, Germany. — 2Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), Universityof Duisburg-Essen, 47048 Duisburg, Germany. — 3Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL, 60439 USA.
Thin film Nb3Sn is a promising candidate to outperform bulk Nb in next generation particle accelerators. Bulk Nb is a well elaborated material for the superconducting radio frequency (SRF) application. However, this technology has reached its physical limits. Thin film Nb3Sn is able to push the limits or save tremendous amounts of energy during operation. Unfortunately, the possible acceleration gradients of about 90 MV/m are not reached. Local deviations of the local stoichiometry and grain boundary segregations can be a possible explanation for this. To improve the local homogeneity and grain boundary conditions, a co-sputtering process is used. Extended X-ray absorption fine structure (EXAFS), X-ray absorption spectroscopy(XAS) mappings and X-ray diffraction (XRD) are used to show different grain boundary and phase conditions. Resistance versus field and resistance versus temperature measurements demonstrate the role of grain boundary and phase of the present Nb3Sn thin films.