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TY - CPAPER AU - Liepe, M. AU - Clasby, B. AU - Eichhorn, R.G. AU - Elmore, B. AU - Furuta, F. AU - Ge, G.M. AU - Gonnella, D. AU - Gruber, T. AU - Hall, D.L. AU - Hoffstaetter, G.H. AU - Kaufman, J.J. AU - Koufalis, P.N. AU - Maniscalco, J.T. AU - O'Connell, T.I. AU - Quigley, P. AU - Sabol, D.M. AU - Sears, J. AU - Smith, E.N. AU - Veshcherevich, V. TI - Niobium Impurity-Doping Studies at Cornell and CM Cool-Down Dynamic Effect on Q0 J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - As part of a multi-laboratory research initiative on high Q0 niobium cavities for LCLS-II and other future CW SRF accelerators, Cornell has conducted an extensive research program during the last two years on impurity-doping of niobium cavities and related material characterization. Here we give an overview of these activities, and present results from single-cell studies, from vertical performance testing of nitrogen-doped nine-cell cavities, and from cryomodule testing of nitrogen-doped nine-cell cavities. PB - JACoW CY - Geneva, Switzerland SP - 55 EP - 60 KW - cavity KW - cryomodule KW - SRF KW - niobium KW - superconductivity DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-MOBA08 UR - http://srf2015.vrws.de/papers/moba08.pdf ER -