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PUBDB-2022-06523

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Synchrotron XPS Study of Niobium Treated with Nitrogen Infusion

Prudnikava, A. (Corresponding author)Extern* ; Aristov, V.Extern*XFEL.EU* ; Babenkov, S.Extern* ; Knobloch, J. ; Kugeler, O. ; Makarova, A. ; Molodtsova, O.DESY* ; Smirnov, D. ; Tamashevich, Y.Extern*

2022
JACoW Publishing Geneva, Switzerland
ISBN: 978-3-95450-233-2

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Please use a persistent id in citations: doi:10.18429/JACoW-SRF2021-MOPTEV006  doi:10.3204/PUBDB-2022-06523

Abstract: 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 N$_2$ 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

Keyword(s): Accelerator Physics ; SRF Technology ; niobium ; vacuum ; cavity ; experiment ; synchrotron

Note: "The Twentieth International Conference on Radio-Frequency Superconductivity, SRF 2021, was a virtual conference due to the COVID-19 Pandemic." - Vorwort (Seite iii); Literaturangaben;

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Contributing Institute(s):

1. PETRA-S (FS-PETRA-S)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2022

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