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TY - CONF AU - Wenskat, M. AU - Bate, C. AU - Dangwal Pandey, A.D. AU - Foster, B. AU - Keller, T.F. AU - Reschke, D. AU - Schaffran, J. AU - Semione, G.D.L. AU - Sievers, S. AU - Stierle, A. AU - Walker, N. AU - Weise, H. ED - Schaa, Volker RW ED - Pei, Guoxi ED - Chin, Yong Ho ED - Fu, Shinian ED - Zhao, Ning TI - Nitrogen Infusion R&D for CW Operation at DESY J2 - Proc. of LINAC2018, Beijing, China, 16-21 September 2018 CY - Beijing, China T2 - Linear Accelerator Conference T3 - 29 LA - english AB - The European XFEL cw upgrade requires cavities with reduced surface resistance (high Q-values) for high duty-cycle while maintaining high accelerating gradient for short-pulse operation. To improve on European XFEL performance, a recently discovered treatment is investigated: The so called Nitrogen-infusion. The recent test results of the cavity based R&D and the progress of the relevant infrastructure is presented. The aim of this approach is to establish a stable, reproducible recipe and to identify all key parameters for this process. In parallel, advanced surface analyses, such as SEM/EDX, TEM, XPS, XRR, GIXRD and TOF-SIMS, of samples after in-situ treatment, cut-outs of cavities and samples treated together with cavities are done. The aim of this approach is to understand the underlying processes of the material evolution, resulting in the improved performance. Results of these analyses, their implications for the cavity R&D, and next steps are presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 652 EP - 657 KW - cavity KW - FEL KW - operation KW - niobium KW - SRF DA - 2019/01 PY - 2019 SN - 2226-0366 SN - 978-3-95450-194-6 DO - DOI: 10.18429/JACoW-LINAC2018-TH2A01 UR - http://jacow.org/linac2018/papers/th2a01.pdf ER -