JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - CONF AU - Prudnikava, A.L. AU - Aristov, V. AU - Babenkov, S. AU - Knobloch, J. AU - Kugeler, O. AU - Makarova, A. AU - Molodtsova, O. AU - Smirnov, D. AU - Tamashevich, Y. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Lesage, Ana ED - Schaa, Volker R.W. TI - Synchrotron XPS Study of Niobium Treated with Nitrogen Infusion J2 - Proc. of SRF2021, East Lansing, MI, USA, 28 June-02 July 2021 CY - East Lansing, MI, USA T2 - International Conference on RF Superconductivity T3 - 20 LA - english AB - 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 PB - JACoW Publishing CP - Geneva, Switzerland SP - 211 EP - 215 KW - niobium KW - vacuum KW - cavity KW - experiment KW - synchrotron DA - 2022/10 PY - 2022 SN - 2673-5504 SN - 978-3-95450-233-2 DO - doi:10.18429/JACoW-SRF2021-MOPTEV006 UR - https://jacow.org/srf2021/papers/moptev006.pdf ER -