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.