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Title |
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| MOPTEV006 |
Synchrotron XPS Study of Niobium Treated with Nitrogen Infusion |
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- A.L. Prudnikava, J. Knobloch, O. Kugeler, Y. Tamashevich
HZB, Berlin, Germany
- V. Aristov, O. Molodtsova
DESY, Hamburg, Germany
- S. Babenkov
LIDYL, Gif sur Yvette, France
- A. Makarova
FUB, Berlin, Germany
- D. Smirnov
Technische Universität Dresden, Dresden, Germany
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Processing of niobium cavities with the so-called ni-trogen infusion treatment demonstrates the improve-ment of efficiency and no degradation of maximal accelerating gradients. However, the chemical compo-sition of the niobium surface and especially the role of nitrogen gas in this treatment has been the topic of many debates. While our study of the infused niobium using synchrotron X-ray Photoelectron Spectroscopy (XPS) showed modification of the surface sub-oxides surprisingly there was no evidence of nitrogen con-centration build up during the 120°C baking step, irre-spectively of N2 supply. Noteworthy, that the niobium contamination with carbon and nitrogen took place during a prolonged high-temperature anneal even in a high vacuum condition (10-8-10-9 mbar). Evidently, the amount of such contamination appears to play a key role in the final cavity performance
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-SRF2021-MOPTEV006
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| About • |
Received ※ 21 June 2021 — Revised ※ 13 July 2021 — Accepted ※ 19 August 2021 — Issue date ※ 05 September 2021 |
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