Liepe, M. Clasby, B. Eichhorn, R.G. Elmore, B. Furuta, F. Ge, G.M. Gonnella, D. Gruber, T. Hall, D.L. Hoffstaetter, G.H. Kaufman, J.J. Koufalis, P.N. Maniscalco, J.T. O'Connell, T.I. Quigley, P. Sabol, D.M. Sears, J. Smith, E.N. Veshcherevich, V. JACoW Geneva, Switzerland 978-3-95450-178-6 10.18429/JACoW-SRF2015-MOBA08 English 55-60 MOBA08 cavity cryomodule SRF niobium superconductivity Contribution to a conference proceedings 2015 2015-12 http://dx.doi.org/10.18429/JACoW-SRF2015-MOBA08 http://srf2015.vrws.de/papers/moba08.pdf 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.