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TY - CONF AU - Bate, C. AU - Dangwal Pandey, A. AU - Ermakov, A. AU - Foster, B. AU - Hillert, W. AU - Keller, T.F. AU - Reschke, D. AU - Schaffran, J. AU - Semione, G.D.L. AU - Sievers, S. AU - Stierle, A. AU - Vonk, V. AU - Walker, N. AU - Weise, H. AU - Wenskat, M. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Nitrogen Infusion Sample R&D at DESY J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - The European XFEL continuous wave upgrade requires cavities with reduced surface resistance (high Q-values) for high duty cycle while maintaining high accelerating gradient for short-pulse operation. A possible way to meet the requirements is the so-called nitrogen infusion procedure. However, a fundamental understanding and a theoretical model of this method are still missing. The approach shown here is based on sample R&D, with the goal to identify key parameters of the process and establish a stable, reproducible recipe. To understand the underlying processes of the surface evolution, which gives improved cavity performance, advanced surface analysis techniques (e.g. SEM/EDX, TEM, XPS, TOF-SIMS) are utilized. Additionally, a small furnace just for samples was set up to change and explore the parameter space of the infusion recipe. Results of these analyses, their implications for the cavity R&D and next steps are presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 77 EP - 82 DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-MOP023 UR - http://jacow.org/srf2019/papers/mop023.pdf ER -