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TY - CONF AU - Gonnella, D. AU - Aderhold, S. AU - Bafia, D. AU - Burrill, A. AU - Checchin, M. AU - Ge, M. AU - Grassellino, A. AU - Hays, G.R. AU - Liepe, M. AU - Martinello, M. AU - Palczewski, A.D. AU - Posen, S. AU - Raubenheimer, T.O. AU - Reece, C.E. AU - Romanenko, A.S. AU - Ross, M.C. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - The LCLS-II HE High Q and Gradient R&D Program J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - The LCLS-II HE project is a high energy upgrade to the superconducting LCLS-II linac. It consists of adding twenty additional 1.3 GHz cryomodules to the linac, with cavities operating at a gradient of 20.8 MV/m with a Q₀ of 2.7·10¹⁰. Performance of LCLS-II cryomodules has suggested that operations at this high of a gradient will not be achievable with the existing cavity recipe employed. Therefore a research program was developed between SLAC, Fermilab, Thomas Jefferson National Accelerator Facility, and Cornell University in order to improve the cavity processing method of the SRF cavities and reach the HE goals. This program explores the doping regime beyond what was done for LCLS-II and also has looked to further developed nitrogen-infusion. Here we will summarize the results from this R\&D program, showing significant improvement on both single-cell and 9-cell cavities compared with the original LCLS-II cavity recipe. PB - JACoW Publishing CP - Geneva, Switzerland SP - 154 EP - 158 KW - cavity KW - SRF KW - cryomodule KW - linac KW - niobium DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-MOP045 UR - http://jacow.org/srf2019/papers/mop045.pdf ER -