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TY - CPAPER AU - Hall, D.L. AU - Gruber, T. AU - Kaufman, J.J. AU - Liepe, M. AU - Maniscalco, J.T. AU - Posen, S. AU - Proslier, Th. AU - Yu, B. TI - Nb3Sn Cavities: Material Characterization and Coating Process Optimization J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - Recent progress on vapour diffusion coated Nb3Sn SRF cavities makes this material a very promising alternative for CW medium field SRF applications. In this paper we report on several systematic studies to determine the sources currently limiting the performance of Nb3Sn cavities to determine improved coating parameters to overcome these limitations. These include a detailed study of the sensitivity of Nb3Sn to trapped ambient magnetic flux, a first measurement of the field dependence of the energy gap in Nb3Sn and detailed measurements of the stoichiometry of the obtained Nb3Sn coatings with synchrotron x-ray diffraction and STEM. Initial results from a study on the impact of the coating process parameters on energy gap, Q-slope, and residual resistance, show clear dependencies, and thus directions for process optimization. PB - JACoW CY - Geneva, Switzerland SP - 501 EP - 504 KW - cavity KW - simulation KW - SRF KW - niobium KW - radio-frequency DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-TUBA04 UR - http://srf2015.vrws.de/papers/tuba04.pdf ER -