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TY - CONF AU - Lorkiewicz, J. AU - Cieślik, I. AU - Czuma, P.J. AU - Kosińska, A.M. AU - Nietubyć, R. AU - Sekutowicz, J.K. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Preparation of Pb-Photocathodes at National Centre for Nuclear Research in Poland – State of the Art 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 - R&D activities related to preparation of the superconducting Pb photocathode layer on niobium substrate are ongoing at the National Centre for Nuclear Research (NCBJ) in cooperation with DESY, HZDR, HZB, BNL and other research institutes. The activities are part of the R&D program at DESY for the cw-upgrade of E-XFEL and for the newly approved free electron laser facility PolFEL to be built and operated at NCBJ. The optimization results obtained for the lead deposition on niobium and smoothing of the coated layers are reported. The photocathodes samples were tested for their surface morphology, microstructure and quantum efficiency in terms of the impact on the operation of all-superconducting RF electron injector, proposed for both facilities. PB - JACoW Publishing CP - Geneva, Switzerland SP - 25 EP - 30 KW - cathode KW - electron KW - plasma KW - laser KW - gun DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-MOP004 UR - http://jacow.org/srf2019/papers/mop004.pdf ER -