1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

In-situ XPS study of low-temperature baking of SRF niobium cavities

WEPS139
4 Jun 2025, 16:00
2h
Exhibiton Hall A _Salmon (TWTC)

Exhibiton Hall A _Salmon

TWTC

Poster Presentation MC7.T07 Superconducting RF Wednesday Poster Session

Speaker

Alena Prudnikava (Helmholtz-Zentrum Berlin für Materialien und Energie)

Description

We investigated the effects of low-temperature baking, a standard treatment for superconducting radiofrequency (SRF) cavities, on niobium samples using synchrotron X-ray photoelectron spectroscopy. The study examined the chemical state of the niobium surface after chemical treatment with a buffered etching solution, which leaves a native oxide layer, fluorine impurities, and surface hydrocarbons. In-situ analysis was conducted during baking at 120°C for 48 hours in ultra-high vacuum. No significant changes in the core levels were observed; however, subtle variations were detected in the Nb 3d and C 1s spectra. Specifically, the most intense C 1s peak shifted to lower binding energies, indicating the formation of new chemical bonds. Additionally, partial transformation of Nb⁵⁺ to Nb⁴⁺ was observed, with no detectable oxygen depletion within the depth probed by XPS. The potential influence of X-ray exposure on the chemical state of these elements is also discussed.

Region represented Europe
Paper preparation format Word

Authors

Alena Prudnikava (Helmholtz-Zentrum Berlin für Materialien und Energie) Yegor Tamashevich (Helmholtz-Zentrum Berlin für Materialien und Energie)

Co-authors

Anna Efimenko (Helmholtz-Zentrum Berlin für Materialien und Energie) Jens Knobloch (University of Siegen) Oliver Kugeler (Helmholtz-Zentrum Berlin für Materialien und Energie)

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