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TY - CPAPER AU - Ge, G.M. AU - Eichhorn, R.G. AU - Elmore, B. AU - Furuta, F. AU - Gonnella, D. AU - Gruber, T. AU - Hoffstaetter, G.H. AU - Kaufman, J.J. AU - Liepe, M. AU - O'Connell, T.I. AU - Sears, J. AU - Smith, E.N. TI - Performance of Nitrogen-Doped 9-Cell SRF Cavities in Vertical Tests at Cornell University J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - Cornell University treated five LCLS-II 9-cell cavities by nitrogen-doping recipe. In this paper, we reported the performance of these 9-cell cavities. In the treatments, the nitrogen recipes are slightly different. The cavities have been firstly doped under high nitrogen pressure; after the vertical tests some of the cavities has been reset the surface and re-doped under light nitrogen pressure. The detail of the cavity preparation and test results will be shown. The comparison of the different recipes will be discussed. PB - JACoW CY - Geneva, Switzerland SP - 328 EP - 332 KW - cavity KW - SRF KW - superconducting-RF KW - linac KW - HOM DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-MOPB084 UR - http://srf2015.vrws.de/papers/mopb084.pdf ER -