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TY - CPAPER AU - Monaco, L. AU - Michelato, P. AU - Navitski, A. AU - Pagani, C. AU - Prudnikava, A.L. AU - Schaffran, J. AU - Singer, W. AU - Tamashevich, Y. TI - Study of the Evolution of Artificial Defects on the Surface of Niobium During Electrochemical and Chemical Polishing J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - The presence of defects on the inner surface of Nb superconducting RF structures might limit its final performance. For this reason, strict requirements are imposed during mechanical production of the cavities, specifically on the quality control of the inner surface of components, to avoid the presence of defects or scratches. Nevertheless, some defects may remain also after control or can arise from the following production steps. Understanding the evolution of the defect might shine new insight on its origin and help in defining possible repair techniques. This paper reports the topographical evolution of defects on a Nb sample polished with the standard recipe used for the 1.3 GHz cavities of the EXFEL project. Various artificial defects of different shape, dimensions, and thicknesses/depths, with geometrical characteristics similar to the one that may occur during the machining and handling of cavities, have been “ad hoc” produced on the sample of the same material used for the cell fabrication. Analysis shows the evolution of the shape and profile of the defects at the different polishing steps. PB - JACoW CY - Geneva, Switzerland SP - 433 EP - 437 KW - SRF KW - controls KW - laser KW - cavity KW - operation DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-MOPB113 UR - http://srf2015.vrws.de/papers/mopb113.pdf ER -